cpp-httplib/test/test.cc

// NOTE: This file should be saved as UTF-8 w/ BOM
#include <httplib.h>
#include <signal.h>

#ifndef _WIN32
#include <arpa/inet.h>
#include <ctime>
#include <curl/curl.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <unistd.h>
#endif
#include <gtest/gtest.h>

#include <algorithm>
#include <atomic>
#include <cctype>
#include <chrono>
#include <clocale>
#include <cstdio>
#include <fstream>
#include <future>
#include <limits>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <thread>
#include <type_traits>
#include <vector>

#if __cplusplus >= 202002L
inline std::string u8_to_string(const char8_t *s) {
  return std::string(reinterpret_cast<const char *>(s));
}
#define U8(x) u8_to_string(u8##x)
#else
#define U8(x) u8##x
#endif

#define SERVER_CERT_FILE "./cert.pem"
#define SERVER_CERT2_FILE "./cert2.pem"
#define SERVER_CERT_IP_CN_FILE "./cert_ip_cn.pem"
#define SERVER_CERT_DNS_CN_FILE "./cert_dns_cn.pem"
#define SERVER_CERT_IPV6_FILE "./cert_ipv6.pem"
#define SERVER_CERT_SAN_TYPES_FILE "./cert_san_types.pem"
#define SERVER_CERT_WILDCARD_SAN_FILE "./cert_wildcard_san.pem"
#define SERVER_PRIVATE_KEY_FILE "./key.pem"
#define CA_CERT_FILE "./ca-bundle.crt"
#define CLIENT_CA_CERT_FILE "./rootCA.cert.pem"
#define CLIENT_CA_CERT_DIR "."
#define CLIENT_CERT_FILE "./client.cert.pem"
#define CLIENT_PRIVATE_KEY_FILE "./client.key.pem"
#define CLIENT_ENCRYPTED_CERT_FILE "./client_encrypted.cert.pem"
// Mbed TLS < 3.6 (e.g. Ubuntu's 2.28) has no PBES2-AES and needs the PBES1-3DES
// key; 3.6+/4.x (4.x dropped DES) and OpenSSL/wolfSSL use the PBES2 AES key.
#if defined(CPPHTTPLIB_MBEDTLS_SUPPORT) && (MBEDTLS_VERSION_NUMBER < 0x03060000)
#define CLIENT_ENCRYPTED_PRIVATE_KEY_FILE "./client_encrypted_pbes1.key.pem"
#else
#define CLIENT_ENCRYPTED_PRIVATE_KEY_FILE "./client_encrypted.key.pem"
#endif
#define CLIENT_ENCRYPTED_PRIVATE_KEY_PASS "test012!"
#define SERVER_ENCRYPTED_CERT_FILE "./cert_encrypted.pem"
#define SERVER_ENCRYPTED_PRIVATE_KEY_FILE "./key_encrypted.pem"
#define SERVER_ENCRYPTED_PRIVATE_KEY_PASS "test123!"

#ifdef CPPHTTPLIB_SSL_ENABLED
namespace httplib {
namespace tls {
// Declared here for the split build, where the TLS abstraction declarations
// live below the split border; the definitions are linked from httplib.cc.
ca_store_t create_ca_store(const char *pem, size_t len);
bool set_verify_callback(ctx_t ctx, VerifyCallback callback);
std::vector<std::string> get_ca_names(ctx_t ctx);
#ifdef CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN
namespace impl {
SecTrustSettingsResult
macos_ssl_trust_settings_result(CFArrayRef trust_settings);
} // namespace impl
#endif
} // namespace tls
} // namespace httplib
#endif

using namespace std;
using namespace httplib;

const char *HOST = "localhost";

static int get_base_port() {
  const char *shard = getenv("GTEST_SHARD_INDEX");
  return shard ? 11234 + std::atoi(shard) * 100 : 1234;
}

// NOTE: PORT is only for legacy fixtures (ServerTest, etc.).
// New standalone tests MUST use svr.bind_to_any_port() instead.
const int PORT = get_base_port();

const string LONG_QUERY_VALUE = string(25000, '@');
const string LONG_QUERY_URL = "/long-query-value?key=" + LONG_QUERY_VALUE;

const string TOO_LONG_QUERY_VALUE = string(35000, '@');
const string TOO_LONG_QUERY_URL =
    "/too-long-query-value?key=" + TOO_LONG_QUERY_VALUE;

const std::string JSON_DATA = "{\"hello\":\"world\"}";

const string LARGE_DATA = string(1024 * 1024 * 100, '@'); // 100MB

FormData &get_file_value(std::vector<FormData> &items, const char *key) {
  auto it = std::find_if(items.begin(), items.end(), [&](const FormData &file) {
    return file.name == key;
  });
#ifdef CPPHTTPLIB_NO_EXCEPTIONS
  return *it;
#else
  if (it != items.end()) { return *it; }
  throw std::runtime_error("invalid multipart form data name error");
#endif
}

static void read_file(const std::string &path, std::string &out) {
  std::ifstream fs(path, std::ios_base::binary);
  if (!fs) {
#ifdef CPPHTTPLIB_NO_EXCEPTIONS
    return;
#else
    throw std::runtime_error("File not found: " + path);
#endif
  }
  fs.seekg(0, std::ios_base::end);
  auto size = fs.tellg();
  fs.seekg(0);
  out.resize(static_cast<size_t>(size));
  fs.read(&out[0], static_cast<std::streamsize>(size));
}

class UnixSocketTest : public ::testing::Test {
protected:
  void TearDown() override { std::remove(pathname_.c_str()); }

  void client_GET(const std::string &addr) {
    httplib::Client cli{addr};
    cli.set_address_family(AF_UNIX);
    ASSERT_TRUE(cli.is_valid());

    const auto &result = cli.Get(pattern_);
    ASSERT_TRUE(result) << "error: " << result.error();

    const auto &resp = result.value();
    EXPECT_EQ(resp.status, StatusCode::OK_200);
    EXPECT_EQ(resp.body, content_);
  }

  static std::string make_sock_path() {
    const char *shard = getenv("GTEST_SHARD_INDEX");
    return shard ? std::string("./httplib-server-") + shard + ".sock"
                 : "./httplib-server.sock";
  }
  const std::string pathname_{make_sock_path()};
  const std::string pattern_{"/hi"};
  const std::string content_{"Hello World!"};
};

TEST_F(UnixSocketTest, pathname) {
  httplib::Server svr;
  svr.Get(pattern_, [&](const httplib::Request &, httplib::Response &res) {
    res.set_content(content_, "text/plain");
  });

  std::thread t{[&] {
    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(pathname_, 80));
  }};
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();
  ASSERT_TRUE(svr.is_running());

  client_GET(pathname_);
  // ".//x.sock", which is not taken for a URL
  client_GET("./" + pathname_.substr(1));
}

#if defined(__linux__) ||                                                      \
    /* __APPLE__ */ (defined(SOL_LOCAL) && defined(SO_PEERPID))
TEST_F(UnixSocketTest, PeerPid) {
  httplib::Server svr;
  std::string remote_port_val;
  svr.Get(pattern_, [&](const httplib::Request &req, httplib::Response &res) {
    res.set_content(content_, "text/plain");
    remote_port_val = std::to_string(req.remote_port);
  });

  std::thread t{[&] {
    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(pathname_, 80));
  }};
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();
  ASSERT_TRUE(svr.is_running());

  client_GET(pathname_);
  EXPECT_EQ(std::to_string(getpid()), remote_port_val);
}
#endif

#ifdef __linux__
TEST_F(UnixSocketTest, abstract) {
  constexpr char svr_path[]{"\x00httplib-server.sock"};
  const std::string abstract_addr{svr_path, sizeof(svr_path) - 1};

  httplib::Server svr;
  svr.Get(pattern_, [&](const httplib::Request &, httplib::Response &res) {
    res.set_content(content_, "text/plain");
  });

  std::thread t{[&] {
    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(abstract_addr, 80));
  }};
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();
  ASSERT_TRUE(svr.is_running());

  client_GET(abstract_addr);
}
#endif

TEST_F(UnixSocketTest, HostHeaderAutoSet) {
  httplib::Server svr;
  std::string received_host_header;

  svr.Get(pattern_, [&](const httplib::Request &req, httplib::Response &res) {
    // Capture the Host header sent by the client
    auto host_iter = req.headers.find("Host");
    if (host_iter != req.headers.end()) {
      received_host_header = host_iter->second;
    }
    res.set_content(content_, "text/plain");
  });

  std::thread t{[&] {
    ASSERT_TRUE(svr.set_address_family(AF_UNIX).listen(pathname_, 80));
  }};
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();
  ASSERT_TRUE(svr.is_running());

  // Test that Host header is automatically set to "localhost" for Unix socket
  // connections
  httplib::Client cli{pathname_};
  cli.set_address_family(AF_UNIX);
  ASSERT_TRUE(cli.is_valid());

  const auto &result = cli.Get(pattern_);
  ASSERT_TRUE(result) << "error: " << result.error();

  const auto &resp = result.value();
  EXPECT_EQ(resp.status, StatusCode::OK_200);
  EXPECT_EQ(resp.body, content_);

  // Verify that Host header was automatically set to "localhost"
  EXPECT_EQ(received_host_header, "localhost");
}

#ifndef _WIN32
TEST(SocketStream, wait_writable_UNIX) {
  int fds[2];
  ASSERT_EQ(0, socketpair(AF_UNIX, SOCK_STREAM, 0, fds));

  const auto asSocketStream = [&](socket_t fd,
                                  std::function<bool(Stream &)> func) {
    return detail::process_client_socket(
        fd, 0, 0, 0, 0, 0, std::chrono::steady_clock::time_point::min(), func);
  };
  asSocketStream(fds[0], [&](Stream &s0) {
    EXPECT_EQ(s0.socket(), fds[0]);
    EXPECT_TRUE(s0.wait_writable());
    EXPECT_TRUE(s0.is_peer_alive());

    EXPECT_EQ(0, close(fds[1]));
    EXPECT_FALSE(s0.is_peer_alive());

    return true;
  });
  EXPECT_EQ(0, close(fds[0]));
}

TEST(SocketStream, wait_writable_INET) {
  sockaddr_in addr;
  memset(&addr, 0, sizeof(addr));
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(PORT + 1));
  addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

  int disconnected_svr_sock = -1;
  std::thread svr{[&] {
    const int s = socket(AF_INET, SOCK_STREAM, 0);
    ASSERT_LE(0, s);
    // PORT + 1 is shared with the SSL redirect tests and with
    // VulnerabilityTest.CRLFInjectionInHeaders, all of which set this. Without
    // it, a TIME_WAIT one of them left behind makes bind() fail here, and
    // because that happens on a worker thread the ASSERT does not stop the
    // test: it runs on and fails at the disconnected_svr_sock check instead.
    default_socket_options(s);
    ASSERT_EQ(0, ::bind(s, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
    ASSERT_EQ(0, listen(s, 1));
    ASSERT_LE(0, disconnected_svr_sock = accept(s, nullptr, nullptr));
    ASSERT_EQ(0, close(s));
  }};
  std::this_thread::sleep_for(std::chrono::milliseconds(100));

  std::thread cli{[&] {
    const int s = socket(AF_INET, SOCK_STREAM, 0);
    ASSERT_LE(0, s);
    ASSERT_EQ(0, connect(s, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
    ASSERT_EQ(0, close(s));
  }};
  cli.join();
  svr.join();
  ASSERT_NE(disconnected_svr_sock, -1);

  const auto asSocketStream = [&](socket_t fd,
                                  std::function<bool(Stream &)> func) {
    return detail::process_client_socket(
        fd, 0, 0, 0, 0, 0, std::chrono::steady_clock::time_point::min(), func);
  };
  asSocketStream(disconnected_svr_sock, [&](Stream &ss) {
    EXPECT_EQ(ss.socket(), disconnected_svr_sock);
    // wait_writable() returns true because select_write() only checks if the
    // send buffer has space. Peer disconnection is detected later by send().
    EXPECT_TRUE(ss.wait_writable());

    return true;
  });

  ASSERT_EQ(0, close(disconnected_svr_sock));
}
#endif // #ifndef _WIN32

TEST(SetSocketOptTest, TcpNoDelay) {
  auto sock = ::socket(AF_INET, SOCK_STREAM, 0);
  ASSERT_NE(sock, INVALID_SOCKET);
  EXPECT_TRUE(set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1));

  int val = 0;
  socklen_t len = sizeof(val);
  ASSERT_EQ(0, ::getsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
                            reinterpret_cast<char *>(&val), &len));
  EXPECT_NE(val, 0);
  detail::close_socket(sock);
}

TEST(AcceptErrorTest, RetryableFailuresAreClassifiedPerPlatform) {
  // accept() reports failures through WSAGetLastError() on Windows and through
  // errno everywhere else. Asking the wrong one is what made the accept loop
  // treat every recoverable failure as fatal on Windows.
  struct Classification {
    bool resource;
    bool transient;
  };

  auto classify = [](int err) {
#ifdef _WIN32
    WSASetLastError(err);
#else
    errno = err;
#endif
    // Read both before asserting: an assertion may clobber the error slot.
    Classification c;
    c.resource = detail::is_accept_resource_error();
    c.transient = detail::is_accept_transient_error();
    return c;
  };

#ifdef _WIN32
  const std::vector<int> resource_errors = {WSAEMFILE, WSAENOBUFS};
  const std::vector<int> transient_errors = {WSAEINTR, WSAEWOULDBLOCK,
                                             WSAECONNRESET, WSAECONNABORTED};
  const std::vector<int> fatal_errors = {WSAENOTSOCK, WSAEINVAL, WSAEOPNOTSUPP};
#else
  const std::vector<int> resource_errors = {EMFILE, ENFILE, ENOBUFS, ENOMEM};
  const std::vector<int> transient_errors = {EINTR, EAGAIN, EWOULDBLOCK,
                                             ECONNABORTED};
  const std::vector<int> fatal_errors = {EBADF, EINVAL, ENOTSOCK};
#endif

  for (auto err : resource_errors) {
    const auto c = classify(err);
    EXPECT_TRUE(c.resource) << "error " << err;
    EXPECT_FALSE(c.transient) << "error " << err;
  }

  for (auto err : transient_errors) {
    const auto c = classify(err);
    EXPECT_TRUE(c.transient) << "error " << err;
    EXPECT_FALSE(c.resource) << "error " << err;
  }

  for (auto err : fatal_errors) {
    const auto c = classify(err);
    EXPECT_FALSE(c.resource) << "error " << err;
    EXPECT_FALSE(c.transient) << "error " << err;
  }

#ifdef _WIN32
  WSASetLastError(0);
#else
  errno = 0;
#endif
}

TEST(ClientTest, MoveConstructible) {
  EXPECT_FALSE(std::is_copy_constructible<Client>::value);
  EXPECT_TRUE(std::is_nothrow_move_constructible<Client>::value);
}

TEST(ClientTest, MoveAssignable) {
  EXPECT_FALSE(std::is_copy_assignable<Client>::value);
  EXPECT_TRUE(std::is_nothrow_move_assignable<Client>::value);
}

#ifdef _WIN32
TEST(StartupTest, WSAStartup) {
  WSADATA wsaData;
  int ret = WSAStartup(0x0002, &wsaData);
  ASSERT_EQ(0, ret);
}
#endif

TEST(DecodePathTest, PercentCharacter) {
  EXPECT_EQ(
      decode_path_component(
          R"(descrip=Gastos%20%C3%A1%C3%A9%C3%AD%C3%B3%C3%BA%C3%B1%C3%91%206)"),
      U8("descrip=Gastos áéíóúñÑ 6"));
}

TEST(DecodePathTest, PercentCharacterNUL) {
  string expected;
  expected.push_back('x');
  expected.push_back('\0');
  expected.push_back('x');

  EXPECT_EQ(decode_path_component("x%00x"), expected);
}

TEST(DecodePathTest, UnicodeEncoding) {
  // %u0041 = 'A' (1-byte UTF-8)
  EXPECT_EQ("A", decode_path_component("%u0041"));
  // %u00E9 = 'é' (2-byte UTF-8)
  EXPECT_EQ(U8("é"), decode_path_component("%u00E9"));
  // %u3042 = 'あ' (3-byte UTF-8)
  EXPECT_EQ(U8("あ"), decode_path_component("%u3042"));
  // %uFFFF = max 4-digit hex (3-byte UTF-8, must not overflow buff[4])
  EXPECT_FALSE(decode_path_component("%uFFFF").empty());
  // %uD800 = surrogate (invalid, kept as it is rather than joining its
  // neighbours)
  EXPECT_EQ("%uD800", decode_path_component("%uD800"));
  EXPECT_EQ("/ad%uD800min", decode_path_component("/ad%uD800min"));
}

TEST(DecodeQueryTest, RejectsNonHexEscapes) {
  // A sign or whitespace inside the two-character escape window must not be
  // accepted as a valid percent-encoding; the sequence is passed through
  // literally, matching decode_uri_component / decode_path_component.
  EXPECT_EQ("%-1", decode_query_component("%-1", false));
  EXPECT_EQ("%-0", decode_query_component("%-0", false));
  EXPECT_EQ("%+5", decode_query_component("%+5", false));
  EXPECT_EQ("% 5", decode_query_component("% 5", false));
  // Well-formed escapes still decode.
  EXPECT_EQ("-", decode_query_component("%2D", false));
  EXPECT_EQ("A", decode_query_component("%41", false));
}

TEST(SanitizeFilenameTest, VariousPatterns) {
  // Path traversal
  EXPECT_EQ("passwd", httplib::sanitize_filename("../../../etc/passwd"));
  EXPECT_EQ("passwd", httplib::sanitize_filename("..\\..\\etc\\passwd"));
  EXPECT_EQ("file.txt", httplib::sanitize_filename("path/to\\..\\file.txt"));
  // Normal and edge cases
  EXPECT_EQ("photo.jpg", httplib::sanitize_filename("photo.jpg"));
  EXPECT_EQ("filename.txt",
            httplib::sanitize_filename("/path/to/filename.txt"));
  EXPECT_EQ(".gitignore", httplib::sanitize_filename(".gitignore"));
  EXPECT_EQ("", httplib::sanitize_filename(".."));
  EXPECT_EQ("", httplib::sanitize_filename(""));
  // Null bytes stripped
  EXPECT_EQ("safe.txt",
            httplib::sanitize_filename(std::string("safe\0.txt", 9)));
  // Whitespace-only rejected
  EXPECT_EQ("", httplib::sanitize_filename("   "));
}

// Forward declaration (see the base64_encode note below): split builds move the
// definition into httplib.cc, so re-declaring it here lets the test link.
namespace httplib {
namespace detail {
bool is_chunked_transfer_encoding(const Headers &headers);
} // namespace detail
} // namespace httplib

TEST(ChunkedTransferEncodingTest, DetectsChunkedAsFinalCoding) {
  // Build a Headers with the given Transfer-Encoding lines (nullptr = none).
  auto make = [](std::initializer_list<const char *> lines) {
    Headers h;
    for (auto te : lines) {
      if (te) { h.emplace("Transfer-Encoding", te); }
    }
    return h;
  };

  // Sole coding, matched case-insensitively.
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"chunked"})));
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"Chunked"})));
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"CHUNKED"})));

  // RFC 9112 6.1: chunked as the final coding of a list still frames the body.
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"gzip, chunked"})));
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"gzip,chunked"})));
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"gzip, Chunked "})));

  // Single line: chunked absent, or not the final coding -> not chunk-framed.
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({"gzip"})));
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({"chunked, gzip"})));
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({""})));
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({nullptr})));

  // RFC 9110 5.3: multiple Transfer-Encoding lines combine, in the order they
  // were received, into one list. Headers preserves that order, so the answer
  // is decided by the last coding of the last line and the order the lines
  // arrived in is significant.
  EXPECT_TRUE(detail::is_chunked_transfer_encoding(make({"gzip", "chunked"})));
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({"chunked", "gzip"})));
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({"gzip", "deflate"})));

  // The split can fall anywhere in the list.
  EXPECT_TRUE(
      detail::is_chunked_transfer_encoding(make({"deflate", "gzip, chunked"})));
  EXPECT_FALSE(
      detail::is_chunked_transfer_encoding(make({"gzip, chunked", "deflate"})));

  // A trailing line naming no coding leaves the list ending in nothing, so it
  // must not inherit the chunked from the line before it.
  EXPECT_FALSE(detail::is_chunked_transfer_encoding(make({"chunked", ""})));
}

// Forward declarations (see the base64_encode note below).
namespace httplib {
namespace detail {
bool parse_status_line(const char *line, std::string &version, int &status,
                       std::string &reason);
std::string file_extension(const std::string &path);
std::string
find_content_type(const std::string &path,
                  const std::map<std::string, std::string> &user_data,
                  const std::string &default_content_type);
bool can_compress_content_type(const std::string &content_type);
bool is_prohibited_header_name(const std::string &name);
bool is_valid_path(const std::string &path);
#ifdef CPPHTTPLIB_SSL_ENABLED
bool match_hostname(const std::string &pattern, const std::string &hostname);
#endif
} // namespace detail
} // namespace httplib

TEST(ParseStatusLineTest, ParsesVersionStatusAndReason) {
  struct {
    const char *line;
    const char *version;
    int status;
    const char *reason;
  } cases[] = {
      {"HTTP/1.1 200 OK\r\n", "HTTP/1.1", 200, "OK"},
      {"HTTP/1.0 404 Not Found\r\n", "HTTP/1.0", 404, "Not Found"},
      // The reason phrase may be empty, or left out along with its space.
      {"HTTP/1.1 204 \r\n", "HTTP/1.1", 204, ""},
      {"HTTP/1.1 304\r\n", "HTTP/1.1", 304, ""},
  };

  for (const auto &c : cases) {
    std::string version;
    int status = 0;
    std::string reason = "unset";
    EXPECT_TRUE(detail::parse_status_line(c.line, version, status, reason))
        << c.line;
    EXPECT_EQ(c.version, version);
    EXPECT_EQ(c.status, status);
    EXPECT_EQ(c.reason, reason);
  }
}

TEST(ParseStatusLineTest, RejectsMalformedLines) {
  const char *lines[] = {
      "HTTP/2 200 OK\r\n",
      "HTTP/1.2 200 OK\r\n",
      "HTTP/1.1 20 OK\r\n",
      "HTTP/1.1 2000 OK\r\n",
      "HTTP/1.1 2x0 OK\r\n",
      "HTTP/1.1  200 OK\r\n",
      "HTTP/1.1 200OK\r\n",
      "HTTP/1.1 200 O\rK\r\n",
      "HTTP/1.1 200 OK",
      "HTTP/1.1 200 OK\r\nX",
      "",
#ifndef CPPHTTPLIB_ALLOW_LF_AS_LINE_TERMINATOR
      "HTTP/1.1 200 OK\n",
#endif
  };

  for (auto line : lines) {
    std::string version;
    int status = 0;
    std::string reason;
    EXPECT_FALSE(detail::parse_status_line(line, version, status, reason))
        << line;
  }
}

TEST(ParseStatusLineTest, AcceptsAReasonPhraseAsLongAsALine) {
  // Long enough to overflow the stack when matched with std::regex.
  auto long_reason = std::string(CPPHTTPLIB_MAX_LINE_LENGTH - 15, 'A');
  auto line = "HTTP/1.1 200 " + long_reason + "\r\n";

  std::string version;
  int status = 0;
  std::string reason;
  EXPECT_TRUE(detail::parse_status_line(line.c_str(), version, status, reason));
  EXPECT_EQ(200, status);
  EXPECT_EQ(long_reason, reason);
}

TEST(FileExtensionTest, TakesTheAlphanumericSuffix) {
  EXPECT_EQ("txt", detail::file_extension("a.txt"));
  EXPECT_EQ("gz", detail::file_extension("/dir/a.tar.gz"));
  EXPECT_EQ("htaccess", detail::file_extension(".htaccess"));
  EXPECT_EQ("", detail::file_extension("noext"));
  EXPECT_EQ("", detail::file_extension("a."));
  EXPECT_EQ("", detail::file_extension("dir.d/file"));
  EXPECT_EQ("", detail::file_extension("a.b-c"));

  // Long enough to overflow the stack when matched with std::regex.
  auto long_ext = std::string(CPPHTTPLIB_MAX_LINE_LENGTH, 'a');
  EXPECT_EQ(long_ext, detail::file_extension("a." + long_ext));
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(MatchHostnameTest, FollowsX509CheckHost) {
  EXPECT_TRUE(detail::match_hostname("*.example.com", "www.example.com"));
  EXPECT_TRUE(detail::match_hostname("www*.example.com", "www1.example.com"));
  EXPECT_TRUE(detail::match_hostname("www.example.com", "WWW.example.com."));

  // A wildcard needs two labels after it, in the leftmost label only
  EXPECT_FALSE(detail::match_hostname("*.com", "example.com"));
  EXPECT_FALSE(detail::match_hostname("*", "localhost"));
  EXPECT_FALSE(detail::match_hostname("vic*.test", "victim.test"));
  EXPECT_FALSE(detail::match_hostname("www.*.com", "www.a.com"));
  EXPECT_FALSE(
      detail::match_hostname("xn--*.example.com", "xn--a.example.com"));

  // No name may have an empty label
  EXPECT_FALSE(detail::match_hostname("*.example.com", "a..example.com"));
  EXPECT_FALSE(detail::match_hostname("a..example.com", "a.example.com"));
}
#endif

TEST(CaseIgnoreHashTest, IgnoresCaseAndTakesLongKeys) {
  detail::case_ignore::hash hash;
  EXPECT_EQ(hash("Content-Type"), hash("content-TYPE"));
  EXPECT_NE(hash("Content-Type"), hash("Content-Length"));

  // Long enough to overflow the stack if hashed one call per character.
  EXPECT_EQ(hash(std::string(1 << 20, 'A')), hash(std::string(1 << 20, 'a')));
}

TEST(FindContentTypeTest, ComparesWholeExtensions) {
  EXPECT_EQ("text/html", detail::find_content_type("/a.html", {}, ""));
  EXPECT_EQ("image/svg+xml", detail::find_content_type("/a.svg", {}, ""));
  EXPECT_EQ("text/javascript", detail::find_content_type("/a.js", {}, ""));
  EXPECT_EQ("text/html", detail::find_content_type("/INDEX.HTML", {}, ""));

  // Same 26-bit hash as html, svg and js.
  EXPECT_EQ("", detail::find_content_type("/a.qo2yh", {}, ""));
  EXPECT_EQ("", detail::find_content_type("/a.q4g", {}, ""));
  EXPECT_EQ("", detail::find_content_type("/a.l5", {}, ""));
}

TEST(IsValidPathTest, RejectsSegmentsEndingInDotOrSpace) {
  for (auto path : {"/a.", "/a ", "/dir./a", "/dir /a", "/..."}) {
    EXPECT_FALSE(detail::is_valid_path(path)) << path;
  }
}

// ':' names an NTFS stream on Windows and is an ordinary character in a file
// name anywhere else.
TEST(IsValidPathTest, ColonIsRejectedOnlyOnWindows) {
  for (auto path : {"/a.txt::$DATA", "/a.txt:Zone.Identifier", "/dir:x/a"}) {
#ifdef _WIN32
    EXPECT_FALSE(detail::is_valid_path(path)) << path;
#else
    EXPECT_TRUE(detail::is_valid_path(path)) << path;
#endif
  }
}

TEST(CanCompressContentTypeTest, ComparesWholeTypes) {
  EXPECT_TRUE(detail::can_compress_content_type("application/json"));
  EXPECT_TRUE(detail::can_compress_content_type("text/plain; charset=utf-8"));
  EXPECT_FALSE(detail::can_compress_content_type("text/event-stream"));
  EXPECT_FALSE(detail::can_compress_content_type("image/png"));
  EXPECT_TRUE(detail::can_compress_content_type("Application/JSON"));
  EXPECT_FALSE(detail::can_compress_content_type("Text/Event-Stream"));

  // Same 26-bit hash as application/json.
  EXPECT_FALSE(detail::can_compress_content_type("VY_LQ"));
}

TEST(MultipartFormDataTest, MediaTypeIgnoresCase) {
  Request req;
  req.set_header("Content-Type", "Multipart/Form-Data; Boundary=x");
  EXPECT_TRUE(req.is_multipart_form_data());

  std::string boundary;
  EXPECT_TRUE(detail::parse_multipart_boundary(
      req.get_header_value("Content-Type"), boundary));
  EXPECT_EQ("x", boundary);
}

TEST(ProhibitedHeaderNameTest, ComparesWholeNames) {
  EXPECT_TRUE(detail::is_prohibited_header_name("REMOTE_ADDR"));
  EXPECT_TRUE(detail::is_prohibited_header_name("LOCAL_PORT"));
  EXPECT_FALSE(detail::is_prohibited_header_name("Host"));
  EXPECT_TRUE(detail::is_prohibited_header_name("remote_addr"));

  // Same 26-bit hash as REMOTE_ADDR.
  EXPECT_FALSE(detail::is_prohibited_header_name("IIJRp"));
}

// Forward declaration: in split builds split.py strips `inline` and moves the
// definition into httplib.cc, so detail::base64_encode is not visible from the
// public httplib.h. Re-declaring it here lets the tests link against the symbol
// in both header-only and split builds.
namespace httplib {
namespace detail {
std::string base64_encode(const std::string &in);
} // namespace detail
} // namespace httplib

TEST(Base64EncodeTest, KnownAnswers) {
  // RFC 4648 test vectors. Inputs of four bytes or more exercise the round
  // where the accumulator's top bit is already set before the next shift.
  EXPECT_EQ("", detail::base64_encode(""));
  EXPECT_EQ("Zg==", detail::base64_encode("f"));
  EXPECT_EQ("Zm8=", detail::base64_encode("fo"));
  EXPECT_EQ("Zm9v", detail::base64_encode("foo"));
  EXPECT_EQ("Zm9vYg==", detail::base64_encode("foob"));
  EXPECT_EQ("Zm9vYmE=", detail::base64_encode("fooba"));
  EXPECT_EQ("Zm9vYmFy", detail::base64_encode("foobar"));

  // High bytes keep the top bit set across several rounds.
  EXPECT_EQ("AAECA//+wIB/", detail::base64_encode(std::string(
                                "\x00\x01\x02\x03\xff\xfe\xc0\x80\x7f", 9)));
}

TEST(EncodeQueryParamTest, ParseUnescapedChararactersTest) {
  string unescapedCharacters = "-_.!~*'()";

  EXPECT_EQ(httplib::encode_uri_component(unescapedCharacters), "-_.!~*'()");
}

TEST(EncodeQueryParamTest, ParseReservedCharactersTest) {
  string reservedCharacters = ";,/?:@&=+$";

  EXPECT_EQ(httplib::encode_uri_component(reservedCharacters),
            "%3B%2C%2F%3F%3A%40%26%3D%2B%24");
}

TEST(ClientQueryOrder, PreserveOrder) {
  // This test reproduces Issue #2259: client may reorder query parameters
  // when sending a GET request. The expected behavior is that the client
  // preserves the original query string order when the caller supplied it
  // as part of the path.
  Server svr;
  svr.Get("/", [&](const Request &req, Response &res) {
    // Echo back the raw target so the test can assert ordering
    res.set_content(req.target, "text/plain");
  });

  std::thread t{[&] { svr.listen(HOST, PORT); }};
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  ASSERT_TRUE(cli.is_valid());

  const std::string original = "/?z=1&y=2&x=3&c=7&b=8&a=9";
  auto res = cli.Get(original);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  // Expect the echoed target to exactly match the original path (order
  // preserved)
  EXPECT_EQ(res->body, original);
}

TEST(EncodeQueryParamTest, TestUTF8Characters) {
  string chineseCharacters = U8("中国語");
  string russianCharacters = U8("дом");
  string brazilianCharacters = U8("óculos");

  EXPECT_EQ(httplib::encode_uri_component(chineseCharacters),
            "%E4%B8%AD%E5%9B%BD%E8%AA%9E");

  EXPECT_EQ(httplib::encode_uri_component(russianCharacters),
            "%D0%B4%D0%BE%D0%BC");

  EXPECT_EQ(httplib::encode_uri_component(brazilianCharacters), "%C3%B3culos");
}

TEST(EncodeUriComponentTest, ParseUnescapedChararactersTest) {
  string unescapedCharacters = "-_.!~*'()";

  EXPECT_EQ(httplib::encode_uri_component(unescapedCharacters), "-_.!~*'()");
}

TEST(EncodeUriComponentTest, ParseReservedCharactersTest) {
  string reservedCharacters = ";,/?:@&=+$";

  EXPECT_EQ(httplib::encode_uri_component(reservedCharacters),
            "%3B%2C%2F%3F%3A%40%26%3D%2B%24");
}

TEST(EncodeUriComponentTest, TestUTF8Characters) {
  string chineseCharacters = U8("中国語");
  string russianCharacters = U8("дом");
  string brazilianCharacters = U8("óculos");

  EXPECT_EQ(httplib::encode_uri_component(chineseCharacters),
            "%E4%B8%AD%E5%9B%BD%E8%AA%9E");

  EXPECT_EQ(httplib::encode_uri_component(russianCharacters),
            "%D0%B4%D0%BE%D0%BC");

  EXPECT_EQ(httplib::encode_uri_component(brazilianCharacters), "%C3%B3culos");
}

TEST(EncodeUriComponentTest, TestPathComponentEncoding) {
  // Issue #2082 use case: encoding path component with ampersand
  string pathWithAmpersand = "Piri Tommy Villiers - on & on";

  EXPECT_EQ(httplib::encode_uri_component(pathWithAmpersand),
            "Piri%20Tommy%20Villiers%20-%20on%20%26%20on");
}

TEST(EncodeUriTest, ParseUnescapedChararactersTest) {
  string unescapedCharacters = "-_.!~*'()";

  EXPECT_EQ(httplib::encode_uri(unescapedCharacters), "-_.!~*'()");
}

TEST(EncodeUriTest, ParseReservedCharactersTest) {
  string reservedCharacters = ";,/?:@&=+$#";

  EXPECT_EQ(httplib::encode_uri(reservedCharacters), ";,/?:@&=+$#");
}

TEST(EncodeUriTest, TestUTF8Characters) {
  string chineseCharacters = U8("中国語");
  string russianCharacters = U8("дом");
  string brazilianCharacters = U8("óculos");

  EXPECT_EQ(httplib::encode_uri(chineseCharacters),
            "%E4%B8%AD%E5%9B%BD%E8%AA%9E");

  EXPECT_EQ(httplib::encode_uri(russianCharacters), "%D0%B4%D0%BE%D0%BC");

  EXPECT_EQ(httplib::encode_uri(brazilianCharacters), "%C3%B3culos");
}

TEST(EncodeUriTest, TestCompleteUri) {
  string uri =
      "https://example.com/path/to/resource?query=value&param=test#fragment";

  EXPECT_EQ(
      httplib::encode_uri(uri),
      "https://example.com/path/to/resource?query=value&param=test#fragment");
}

TEST(EncodeUriTest, TestUriWithSpacesAndSpecialChars) {
  string uri =
      "https://example.com/path with spaces/file name.html?q=hello world";

  EXPECT_EQ(httplib::encode_uri(uri),
            "https://example.com/path%20with%20spaces/"
            "file%20name.html?q=hello%20world");
}

TEST(DecodeUriComponentTest, ParseEncodedChararactersTest) {
  string encodedString = "%3B%2C%2F%3F%3A%40%26%3D%2B%24";

  EXPECT_EQ(httplib::decode_uri_component(encodedString), ";,/?:@&=+$");
}

TEST(DecodeUriComponentTest, ParseUnescapedChararactersTest) {
  string unescapedCharacters = "-_.!~*'()";

  EXPECT_EQ(httplib::decode_uri_component(unescapedCharacters), "-_.!~*'()");
}

TEST(DecodeUriComponentTest, TestUTF8Characters) {
  string encodedChinese = "%E4%B8%AD%E5%9B%BD%E8%AA%9E";
  string encodedRussian = "%D0%B4%D0%BE%D0%BC";
  string encodedBrazilian = "%C3%B3culos";

  EXPECT_EQ(httplib::decode_uri_component(encodedChinese), U8("中国語"));
  EXPECT_EQ(httplib::decode_uri_component(encodedRussian), U8("дом"));
  EXPECT_EQ(httplib::decode_uri_component(encodedBrazilian), U8("óculos"));
}

TEST(DecodeUriComponentTest, TestPathComponentDecoding) {
  string encodedPath = "Piri%20Tommy%20Villiers%20-%20on%20%26%20on";

  EXPECT_EQ(httplib::decode_uri_component(encodedPath),
            "Piri Tommy Villiers - on & on");
}

TEST(DecodeUriTest, ParseEncodedChararactersTest) {
  string encodedString = "%20%22%3C%3E%5C%5E%60%7B%7D%7C";

  EXPECT_EQ(httplib::decode_uri(encodedString), " \"<>\\^`{}|");
}

TEST(DecodeUriTest, ParseUnescapedChararactersTest) {
  string unescapedCharacters = "-_.!~*'();,/?:@&=+$#";

  EXPECT_EQ(httplib::decode_uri(unescapedCharacters), "-_.!~*'();,/?:@&=+$#");
}

TEST(DecodeUriTest, TestUTF8Characters) {
  string encodedChinese = "%E4%B8%AD%E5%9B%BD%E8%AA%9E";
  string encodedRussian = "%D0%B4%D0%BE%D0%BC";
  string encodedBrazilian = "%C3%B3culos";

  EXPECT_EQ(httplib::decode_uri(encodedChinese), U8("中国語"));
  EXPECT_EQ(httplib::decode_uri(encodedRussian), U8("дом"));
  EXPECT_EQ(httplib::decode_uri(encodedBrazilian), U8("óculos"));
}

TEST(DecodeUriTest, TestCompleteUri) {
  string encodedUri = "https://example.com/path%20with%20spaces/"
                      "file%20name.html?q=hello%20world";

  EXPECT_EQ(
      httplib::decode_uri(encodedUri),
      "https://example.com/path with spaces/file name.html?q=hello world");
}

TEST(DecodeUriTest, TestRoundTripWithEncodeUri) {
  string original =
      "https://example.com/path with spaces/file name.html?q=hello world";
  string encoded = httplib::encode_uri(original);
  string decoded = httplib::decode_uri(encoded);

  EXPECT_EQ(decoded, original);
}

TEST(DecodeUriTest, KeepsReservedCharacterEscapes) {
  // decode_uri is the inverse of encode_uri: an escaped reserved character
  // stays encoded so it is not promoted into a real delimiter, while
  // non-reserved escapes still decode (like JS decodeURI).
  EXPECT_EQ(httplib::decode_uri("%2F"), "%2F");
  EXPECT_EQ(httplib::decode_uri("%23"), "%23");
  EXPECT_EQ(httplib::decode_uri("%3F%3A%40%26%3D%2B%24%2C%3B"),
            "%3F%3A%40%26%3D%2B%24%2C%3B");
  EXPECT_EQ(httplib::decode_uri("%2D"), "-");
  EXPECT_EQ(httplib::decode_uri("%20"), " ");
  EXPECT_EQ(httplib::decode_uri("http://example.com/a%2Fb"),
            "http://example.com/a%2Fb");
  // decode_uri_component still decodes the reserved character.
  EXPECT_EQ(httplib::decode_uri_component("%2F"), "/");
}

TEST(DecodeUriComponentTest, TestRoundTripWithEncodeUriComponent) {
  string original = "Piri Tommy Villiers - on & on";
  string encoded = httplib::encode_uri_component(original);
  string decoded = httplib::decode_uri_component(encoded);

  EXPECT_EQ(decoded, original);
}

TEST(TrimTests, TrimStringTests) {
  EXPECT_EQ("abc", detail::trim_copy("abc"));
  EXPECT_EQ("abc", detail::trim_copy("  abc  "));
  EXPECT_TRUE(detail::trim_copy("").empty());
}

TEST(AsciiTest, LocaleIndependentClassification) {
  // detail::is_ascii_digit/alpha/alnum replace the <cctype> classifiers,
  // which consult the global C locale: std::isalnum(0xC5) can return true
  // once an embedder calls setlocale() (observed on macOS). The is_ascii_*
  // helpers must classify every byte by the ASCII grammar alone.
  for (int i = 0; i < 256; i++) {
    auto c = static_cast<char>(i);
    auto is_digit = i >= '0' && i <= '9';
    auto is_upper = i >= 'A' && i <= 'Z';
    auto is_lower = i >= 'a' && i <= 'z';

    EXPECT_EQ(is_digit, detail::is_ascii_digit(c)) << "byte " << i;
    EXPECT_EQ(is_upper || is_lower, detail::is_ascii_alpha(c)) << "byte " << i;
    EXPECT_EQ(is_digit || is_upper || is_lower, detail::is_ascii_alnum(c))
        << "byte " << i;
  }

  // Regression check for the reported byte: 0xC5 is not alphanumeric.
  EXPECT_FALSE(detail::is_ascii_alnum(static_cast<char>(0xC5)));

  // Non-ASCII bytes must be percent-encoded, never passed through as
  // alphanumeric.
  EXPECT_EQ("%C5", httplib::encode_uri_component("\xC5"));
}

TEST(FromCharsTest, Double) {
  // detail::from_chars(double) recognizes exactly the HTTP quality-value
  // grammar (RFC 9110 12.4.2): a non-negative decimal "1*DIGIT [ '.' *DIGIT ]"
  // with no sign, exponent, or "inf"/"nan", parsed locale-independently.
  auto parse = [](const std::string &s, double &v) {
    return detail::from_chars(s.data(), s.data() + s.size(), v);
  };

  double v = -1.0;

  // Representative quality values.
  EXPECT_EQ(parse("0", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 0.0);
  EXPECT_EQ(parse("1", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 1.0);
  EXPECT_EQ(parse("0.8", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 0.8);
  EXPECT_EQ(parse("0.001", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 0.001);
  EXPECT_EQ(parse("1.000", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 1.0);

  // A missing integer or fractional part is tolerated.
  EXPECT_EQ(parse(".5", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 0.5);
  EXPECT_EQ(parse("5.", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 5.0);

  // Values outside [0, 1] still parse; the caller range-checks them.
  EXPECT_EQ(parse("123.456", v).ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 123.456);

  // Stops at the first byte that is not part of the number and reports where.
  std::string trailing = "0.9, text/html";
  auto r = parse(trailing, v);
  EXPECT_EQ(r.ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 0.9);
  EXPECT_EQ(*r.ptr, ',');

  // Sign and exponent are NOT part of the grammar: '+'/'-' are rejected
  // outright, and an 'e'/'E' simply ends the number.
  EXPECT_EQ(parse("-3.25", v).ec, std::errc::invalid_argument);
  EXPECT_EQ(parse("+2.5", v).ec, std::errc::invalid_argument);
  std::string exp_input = "1.5e3";
  r = parse(exp_input, v);
  EXPECT_EQ(r.ec, std::errc{});
  EXPECT_DOUBLE_EQ(v, 1.5);
  EXPECT_EQ(*r.ptr, 'e');

  // Invalid inputs.
  EXPECT_EQ(parse("", v).ec, std::errc::invalid_argument);
  EXPECT_EQ(parse(".", v).ec, std::errc::invalid_argument);
  EXPECT_EQ(parse("abc", v).ec, std::errc::invalid_argument);
  EXPECT_EQ(parse("nan", v).ec, std::errc::invalid_argument);
  EXPECT_EQ(parse("inf", v).ec, std::errc::invalid_argument);

  // Pathological but well-formed inputs must stay bounded (no overflow, no
  // out-of-bounds table access) and stay within [0, 1] for the caller.
  EXPECT_EQ(parse(std::string("0.") + std::string(500, '0'), v).ec,
            std::errc{});
  EXPECT_DOUBLE_EQ(v, 0.0);
  EXPECT_EQ(parse(std::string("0.") + std::string(500, '9'), v).ec,
            std::errc{});
  EXPECT_GE(v, 0.0);
  EXPECT_LE(v, 1.0);
  EXPECT_EQ(parse(std::string(500, '9'), v).ec, std::errc{});
  EXPECT_GT(v, 1.0); // huge integer: finite, > 1, so the caller rejects it
}

TEST(ParseAcceptHeaderTest, BasicAcceptParsing) {
  // Simple case without quality values
  std::vector<std::string> result1;
  EXPECT_TRUE(detail::parse_accept_header(
      "text/html,application/json,text/plain", result1));
  EXPECT_EQ(result1.size(), 3U);
  EXPECT_EQ(result1[0], "text/html");
  EXPECT_EQ(result1[1], "application/json");
  EXPECT_EQ(result1[2], "text/plain");

  // With quality values
  std::vector<std::string> result2;
  EXPECT_TRUE(detail::parse_accept_header(
      "text/html;q=0.9,application/json;q=1.0,text/plain;q=0.8", result2));
  EXPECT_EQ(result2.size(), 3U);
  EXPECT_EQ(result2[0], "application/json"); // highest q value
  EXPECT_EQ(result2[1], "text/html");
  EXPECT_EQ(result2[2], "text/plain"); // lowest q value
}

TEST(ParseAcceptHeaderTest, MixedQualityValues) {
  // Mixed with and without quality values
  std::vector<std::string> result;
  EXPECT_TRUE(detail::parse_accept_header(
      "text/html,application/json;q=0.5,text/plain;q=0.8", result));
  EXPECT_EQ(result.size(), 3U);
  EXPECT_EQ(result[0], "text/html");        // no q value means 1.0
  EXPECT_EQ(result[1], "text/plain");       // q=0.8
  EXPECT_EQ(result[2], "application/json"); // q=0.5
}

TEST(ParseAcceptHeaderTest, EdgeCases) {
  // Empty header
  std::vector<std::string> empty_result;
  EXPECT_TRUE(detail::parse_accept_header("", empty_result));
  EXPECT_TRUE(empty_result.empty());

  // Single type
  std::vector<std::string> single_result;
  EXPECT_TRUE(detail::parse_accept_header("application/json", single_result));
  EXPECT_EQ(single_result.size(), 1U);
  EXPECT_EQ(single_result[0], "application/json");

  // Wildcard types
  std::vector<std::string> wildcard_result;
  EXPECT_TRUE(detail::parse_accept_header(
      "text/*;q=0.5,*/*;q=0.1,application/json", wildcard_result));
  EXPECT_EQ(wildcard_result.size(), 3U);
  EXPECT_EQ(wildcard_result[0], "application/json");
  EXPECT_EQ(wildcard_result[1], "text/*");
  EXPECT_EQ(wildcard_result[2], "*/*");
}

TEST(ParseAcceptHeaderTest, RealWorldExamples) {
  // Common browser Accept header
  std::vector<std::string> browser_result;
  EXPECT_TRUE(
      detail::parse_accept_header("text/html,application/xhtml+xml,application/"
                                  "xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
                                  browser_result));
  EXPECT_EQ(browser_result.size(), 6U);
  EXPECT_EQ(browser_result[0], "text/html");             // q=1.0 (default)
  EXPECT_EQ(browser_result[1], "application/xhtml+xml"); // q=1.0 (default)
  EXPECT_EQ(browser_result[2], "image/webp");            // q=1.0 (default)
  EXPECT_EQ(browser_result[3], "image/apng");            // q=1.0 (default)
  EXPECT_EQ(browser_result[4], "application/xml");       // q=0.9
  EXPECT_EQ(browser_result[5], "*/*");                   // q=0.8

  // API client header
  std::vector<std::string> api_result;
  EXPECT_TRUE(detail::parse_accept_header(
      "application/json;q=0.9,application/xml;q=0.8,text/plain;q=0.1",
      api_result));
  EXPECT_EQ(api_result.size(), 3U);
  EXPECT_EQ(api_result[0], "application/json");
  EXPECT_EQ(api_result[1], "application/xml");
  EXPECT_EQ(api_result[2], "text/plain");
}

TEST(ParseAcceptHeaderTest, SpecialCases) {
  // Quality value with 3 decimal places
  std::vector<std::string> decimal_result;
  EXPECT_TRUE(detail::parse_accept_header(
      "text/html;q=0.123,application/json;q=0.456", decimal_result));
  EXPECT_EQ(decimal_result.size(), 2U);
  EXPECT_EQ(decimal_result[0], "application/json"); // Higher q value
  EXPECT_EQ(decimal_result[1], "text/html");

  // Zero quality (should still be included but with lowest priority)
  std::vector<std::string> zero_q_result;
  EXPECT_TRUE(detail::parse_accept_header("text/html;q=0,application/json;q=1",
                                          zero_q_result));
  EXPECT_EQ(zero_q_result.size(), 2U);
  EXPECT_EQ(zero_q_result[0], "application/json"); // q=1
  EXPECT_EQ(zero_q_result[1], "text/html");        // q=0

  // No spaces around commas
  std::vector<std::string> no_space_result;
  EXPECT_TRUE(detail::parse_accept_header(
      "text/html;q=0.9,application/json;q=0.8,text/plain;q=0.7",
      no_space_result));
  EXPECT_EQ(no_space_result.size(), 3U);
  EXPECT_EQ(no_space_result[0], "text/html");
  EXPECT_EQ(no_space_result[1], "application/json");
  EXPECT_EQ(no_space_result[2], "text/plain");
}

TEST(ParseAcceptHeaderTest, QualityValueLocaleIndependence) {
  // Quality values always use '.' as the decimal separator, so parsing must
  // not depend on the process locale. An embedding application may have
  // switched to a locale that uses ',' via setlocale(LC_ALL, "").
  const char *cur = std::setlocale(LC_NUMERIC, nullptr);
  std::string saved = cur ? cur : "C";

  const char *comma_locales[] = {"de_DE.UTF-8", "de_DE.utf8", "nl_NL.UTF-8",
                                 "fr_FR.UTF-8"};
  bool switched = false;
  for (const auto loc : comma_locales) {
    if (std::setlocale(LC_NUMERIC, loc) != nullptr &&
        std::localeconv()->decimal_point[0] == ',') {
      switched = true;
      break;
    }
  }
  if (!switched) {
    std::setlocale(LC_NUMERIC, saved.c_str());
    GTEST_SKIP() << "no comma-decimal locale available on this host";
  }

  // The higher-weighted type appears later in the list, so a correct parse
  // must reorder it ahead of the earlier, lower-weighted one. A locale-
  // sensitive parse reads both weights as 0 and leaves the original order.
  std::vector<std::string> result;
  EXPECT_TRUE(detail::parse_accept_header(
      "application/json;q=0.1,text/html;q=0.9", result));
  ASSERT_EQ(result.size(), 2U);
  EXPECT_EQ(result[0], "text/html");
  EXPECT_EQ(result[1], "application/json");

  std::setlocale(LC_NUMERIC, saved.c_str());
}

TEST(ParseAcceptHeaderTest, InvalidCases) {
  std::vector<std::string> result;

  // Invalid quality value (> 1.0)
  EXPECT_FALSE(
      detail::parse_accept_header("text/html;q=1.5,application/json", result));

  // Invalid quality value (< 0.0)
  EXPECT_FALSE(
      detail::parse_accept_header("text/html;q=-0.1,application/json", result));

  // Invalid quality value (not a number)
  EXPECT_FALSE(detail::parse_accept_header(
      "text/html;q=invalid,application/json", result));

  // A valid numeric prefix does not make the entire quality value valid.
  EXPECT_FALSE(detail::parse_accept_header(
      "text/html;q=0.5junk,application/json", result));

  // Empty quality value
  EXPECT_FALSE(
      detail::parse_accept_header("text/html;q=,application/json", result));

  // Invalid media type format (no slash and not wildcard)
  EXPECT_FALSE(
      detail::parse_accept_header("invalidtype,application/json", result));

  // Valid cases should still work
  EXPECT_TRUE(detail::parse_accept_header("*/*", result));
  EXPECT_EQ(result.size(), 1U);
  EXPECT_EQ(result[0], "*/*");

  EXPECT_TRUE(detail::parse_accept_header("*", result));
  EXPECT_EQ(result.size(), 1U);
  EXPECT_EQ(result[0], "*");

  EXPECT_TRUE(detail::parse_accept_header("text/*", result));
  EXPECT_EQ(result.size(), 1U);
  EXPECT_EQ(result[0], "text/*");
}

// RFC 9110 Section 5.6.1.2: a recipient has to parse and ignore empty list
// elements, so a leading, trailing or doubled comma is a legal Accept value
// and must not be answered with 400 Bad Request.
TEST(ParseAcceptHeaderTest, EmptyListElementsAreIgnored) {
  struct {
    const char *value;
    std::vector<std::string> expected;
  } cases[] = {
      {",application/json", {"application/json"}},
      {"text/html,", {"text/html"}},
      {"text/html,,*/*", {"text/html", "*/*"}},
      // An empty element may be spelled with whitespace in it
      {"text/html, , application/json", {"text/html", "application/json"}},
      // Nothing but empty elements is an empty list, which means the same
      // thing as no Accept header at all
      {",,,", {}},
      // Quality values still apply across ignored empty elements
      {",text/html;q=0.5,,application/json", {"application/json", "text/html"}},
  };

  for (const auto &c : cases) {
    std::vector<std::string> result;
    EXPECT_TRUE(detail::parse_accept_header(c.value, result))
        << "value: " << c.value;
    EXPECT_EQ(c.expected, result) << "value: " << c.value;
  }

  // An invalid entry is still rejected when empty elements surround it
  std::vector<std::string> result;
  EXPECT_FALSE(detail::parse_accept_header(",invalidtype,", result));
}

// RFC 9110 Section 5.6.6: a parameter value may be a quoted-string, and a ','
// or ';' inside one does not end the list element or the parameter. Section
// 5.6.4: nor does a '"' that a backslash escapes end the quoted-string.
TEST(ParseAcceptHeaderTest, DelimitersInQuotedParameterValues) {
  struct {
    const char *value;
    std::vector<std::string> expected;
  } cases[] = {
      {"text/html;profile=\"a,b\",application/json",
       {"text/html", "application/json"}},
      // A "q=" inside a quoted value is not the weight
      {"text/html;profile=\"a;q=0.1\",application/json;q=0.5",
       {"text/html", "application/json"}},
      // The weight after a quoted value still applies
      {"text/html;profile=\"a,b;q=0.1\";q=0.8,application/json;q=0.9",
       {"application/json", "text/html"}},
      {"text/html;profile=\"a\\\",b\";q=0.8,application/json;q=0.9",
       {"application/json", "text/html"}},
      {"text/html;profile=\"a\\\"b\",application/json",
       {"text/html", "application/json"}},
      // An escaped backslash does not escape the '"' after it
      {"text/html;profile=\"a\\\\\",application/json",
       {"text/html", "application/json"}},
  };

  for (const auto &c : cases) {
    std::vector<std::string> result;
    EXPECT_TRUE(detail::parse_accept_header(c.value, result))
        << "value: " << c.value;
    EXPECT_EQ(c.expected, result) << "value: " << c.value;
  }
}

TEST(ParseAcceptHeaderTest, ContentTypesPopulatedAndInvalidHeaderHandling) {
  Server svr;

  svr.Get("/accept_ok", [&](const Request &req, Response &res) {
    EXPECT_EQ(req.accept_content_types.size(), 3U);
    EXPECT_EQ(req.accept_content_types[0], "application/json");
    EXPECT_EQ(req.accept_content_types[1], "text/html");
    EXPECT_EQ(req.accept_content_types[2], "*/*");
    res.set_content("ok", "text/plain");
  });

  svr.Get("/accept_bad_request", [&](const Request & /*req*/, Response &res) {
    EXPECT_TRUE(false);
    res.set_content("bad request", "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  {
    auto res = cli.Get(
        "/accept_ok",
        Headers{{"Accept", "application/json, text/html;q=0.8, */*;q=0.1"}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    auto res = cli.Get("/accept_bad_request",
                       Headers{{"Accept", "text/html;q=abc,application/json"}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::BadRequest_400, res->status);
  }
}

TEST(ServerStartHandlerTest, CalledOnceWhenReady) {
  Server svr;
  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  std::atomic<int> start_count{0};
  std::atomic<bool> running_when_called{false};
  svr.set_start_handler([&]() {
    running_when_called = svr.is_running();
    start_count++;
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // A successful request proves the accept loop is running, which the start
  // handler precedes; so by now the handler must have run exactly once.
  Client cli(HOST, port);
  cli.set_connection_timeout(std::chrono::seconds(5));
  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  EXPECT_EQ(1, start_count.load());
  EXPECT_TRUE(running_when_called.load());
}

TEST(DivideTest, DivideStringTests) {
  auto divide = [](const std::string &str, char d) {
    std::string lhs;
    std::string rhs;

    detail::divide(str, d,
                   [&](const char *lhs_data, std::size_t lhs_size,
                       const char *rhs_data, std::size_t rhs_size) {
                     lhs.assign(lhs_data, lhs_size);
                     rhs.assign(rhs_data, rhs_size);
                   });

    return std::make_pair(std::move(lhs), std::move(rhs));
  };

  {
    const auto res = divide("", '=');
    EXPECT_EQ(res.first, "");
    EXPECT_EQ(res.second, "");
  }

  {
    const auto res = divide("=", '=');
    EXPECT_EQ(res.first, "");
    EXPECT_EQ(res.second, "");
  }

  {
    const auto res = divide(" ", '=');
    EXPECT_EQ(res.first, " ");
    EXPECT_EQ(res.second, "");
  }

  {
    const auto res = divide("a", '=');
    EXPECT_EQ(res.first, "a");
    EXPECT_EQ(res.second, "");
  }

  {
    const auto res = divide("a=", '=');
    EXPECT_EQ(res.first, "a");
    EXPECT_EQ(res.second, "");
  }

  {
    const auto res = divide("=b", '=');
    EXPECT_EQ(res.first, "");
    EXPECT_EQ(res.second, "b");
  }

  {
    const auto res = divide("a=b", '=');
    EXPECT_EQ(res.first, "a");
    EXPECT_EQ(res.second, "b");
  }

  {
    const auto res = divide("a=b=", '=');
    EXPECT_EQ(res.first, "a");
    EXPECT_EQ(res.second, "b=");
  }

  {
    const auto res = divide("a=b=c", '=');
    EXPECT_EQ(res.first, "a");
    EXPECT_EQ(res.second, "b=c");
  }
}

TEST(SplitTest, ParseQueryString) {
  string s = "key1=val1&key2=val2&key3=val3";
  Params dic;

  detail::split(s.c_str(), s.c_str() + s.size(), '&',
                [&](const char *b, const char *e) {
                  string key, val;
                  detail::split(b, e, '=', [&](const char *b2, const char *e2) {
                    if (key.empty()) {
                      key.assign(b2, e2);
                    } else {
                      val.assign(b2, e2);
                    }
                  });
                  dic.emplace(key, val);
                });

  EXPECT_EQ("val1", dic.find("key1")->second);
  EXPECT_EQ("val2", dic.find("key2")->second);
  EXPECT_EQ("val3", dic.find("key3")->second);
}

TEST(SplitTest, ParseInvalidQueryTests) {

  {
    string s = " ";
    Params dict;
    detail::parse_query_text(s, dict);
    EXPECT_TRUE(dict.empty());
  }

  {
    string s = " = =";
    Params dict;
    detail::parse_query_text(s, dict);
    EXPECT_TRUE(dict.empty());
  }
}

TEST(ParseQueryTest, ParseQueryString) {
  {
    std::string s = "key1=val1&key2=val2&key3=val3";
    Params dic;

    detail::parse_query_text(s, dic);

    EXPECT_EQ("val1", dic.find("key1")->second);
    EXPECT_EQ("val2", dic.find("key2")->second);
    EXPECT_EQ("val3", dic.find("key3")->second);
  }

  {
    std::string s = "key1&key2=val1&key3=val1=val2&key4=val1=val2=val3";
    Params dic;

    detail::parse_query_text(s, dic);

    EXPECT_EQ("", dic.find("key1")->second);
    EXPECT_EQ("val1", dic.find("key2")->second);
    EXPECT_EQ("val1=val2", dic.find("key3")->second);
    EXPECT_EQ("val1=val2=val3", dic.find("key4")->second);
  }
}

TEST(ParamsToQueryTest, ConvertParamsToQuery) {
  Params dic;

  EXPECT_EQ(detail::params_to_query_str(dic), "");

  dic.emplace("key1", "val1");

  EXPECT_EQ(detail::params_to_query_str(dic), "key1=val1");

  dic.emplace("key2", "val2");
  dic.emplace("key3", "val3");

  EXPECT_EQ(detail::params_to_query_str(dic), "key1=val1&key2=val2&key3=val3");
}

TEST(AppendQueryParamsTest, JoinsAnExistingQuery) {
  Params params;
  params.emplace("a", "1");

  EXPECT_EQ("/p?a=1", append_query_params("/p", params));
  EXPECT_EQ("/p?x=0&a=1", append_query_params("/p?x=0", params));
  EXPECT_EQ("/p?&a=1", append_query_params("/p?", params));
  EXPECT_EQ("?x=0&a=1", append_query_params("?x=0", params));

  // Long enough to overflow the stack when matched with std::regex.
  auto long_query = std::string(CPPHTTPLIB_MAX_LINE_LENGTH, 'x');
  EXPECT_EQ("/p?" + long_query + "&a=1",
            append_query_params("/p?" + long_query, params));
}

// Joins every entry of a Headers or Params into "key=value " so a whole
// traversal can be compared in one assertion. Both are instantiations of the
// same insertion-ordered container, so one helper serves both.
template <typename Map> static std::string entries_to_string(const Map &m) {
  std::string s;
  for (const auto &entry : m) {
    s += entry.first + "=" + entry.second + " ";
  }
  return s;
}

TEST(ParamsOrderTest, QueryIsBuiltInInsertionOrderNotSorted) {
  // Params used to be a std::multimap, which sorted by name and handed the
  // caller's query back alphabetised. A client signing its query string could
  // not reproduce the order it asked for.
  Params dic;
  dic.emplace("zulu", "1");
  dic.emplace("alpha", "2");
  dic.emplace("mike", "3");

  EXPECT_EQ("zulu=1&alpha=2&mike=3", detail::params_to_query_str(dic));
  EXPECT_EQ("/p?zulu=1&alpha=2&mike=3", append_query_params("/p", dic));
}

TEST(ParamsOrderTest, ParsingKeepsTheOrderReceived) {
  Params dic;
  detail::parse_query_text("zulu=1&alpha=2&mike=3", dic);

  EXPECT_EQ("zulu=1 alpha=2 mike=3 ", entries_to_string(dic));
}

TEST(ParamsOrderTest, RepeatedNamesKeepTheirOrder) {
  Request req;
  detail::parse_query_text("tag=first&other=x&tag=second&tag=third",
                           req.params);

  EXPECT_EQ(3U, req.get_param_value_count("tag"));
  EXPECT_EQ("first", req.get_param_value("tag"));
  EXPECT_EQ("first", req.get_param_value("tag", 0));
  EXPECT_EQ("second", req.get_param_value("tag", 1));
  EXPECT_EQ("third", req.get_param_value("tag", 2));
  EXPECT_EQ("", req.get_param_value("tag", 3));
}

TEST(ParamsOrderTest, LookupStaysCaseSensitive) {
  // Params shares its container with Headers, which matches field names
  // case-insensitively. Parameter names must not pick that up.
  Params dic;
  dic.emplace("Key", "upper");
  dic.emplace("key", "lower");

  EXPECT_EQ(2U, dic.size());
  EXPECT_EQ(1U, dic.count("Key"));
  EXPECT_EQ(1U, dic.count("key"));
  EXPECT_EQ("upper", dic.find("Key")->second);
  EXPECT_EQ("lower", dic.find("key")->second);
  EXPECT_TRUE(dic.find("KEY") == dic.end());
}

TEST(ParamsOrderTest, ServerSeesTheOrderTheClientSent) {
  Server svr;
  std::string order;
  svr.Get("/order", [&](const Request &req, Response &res) {
    order = entries_to_string(req.params);
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get("/order?zulu=1&alpha=2&tag=x&mike=3&tag=y");
  ASSERT_TRUE(res);
  EXPECT_EQ("zulu=1 alpha=2 tag=x mike=3 tag=y ", order);
}

TEST(MultipartOrderTest, PartsKeepTheOrderSent) {
  Server svr;
  std::string field_order, file_order;
  svr.Post("/order", [&](const Request &req, Response &res) {
    for (const auto &field : req.form.fields) {
      field_order += field.first + "=" + field.second.content + " ";
    }
    for (const auto &file : req.form.files) {
      file_order += file.first + "=" + file.second.filename + " ";
    }
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  UploadFormDataItems items = {
      {"zulu", "1", "", ""},
      {"alpha", "2", "", ""},
      {"mike", "3", "", ""},
      {"zebra", "z", "z.txt", "text/plain"},
      {"apple", "a", "a.txt", "text/plain"},
  };

  Client cli(HOST, port);
  auto res = cli.Post("/order", items);
  ASSERT_TRUE(res);
  EXPECT_EQ("zulu=1 alpha=2 mike=3 ", field_order);
  EXPECT_EQ("zebra=z.txt apple=a.txt ", file_order);
}

TEST(MultipartOrderTest, RepeatedNamesKeepTheirOrder) {
  Server svr;
  std::vector<std::string> values;
  std::string first, second, out_of_range, order;
  svr.Post("/repeated", [&](const Request &req, Response &res) {
    values = req.form.get_fields("tag");
    first = req.form.get_field("tag", 0);
    second = req.form.get_field("tag", 1);
    out_of_range = req.form.get_field("tag", 2);
    for (const auto &field : req.form.fields) {
      order += field.first + "=" + field.second.content + " ";
    }
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // "other" sits between the two "tag" parts, so the entries sharing a name are
  // not adjacent in the container.
  UploadFormDataItems items = {
      {"tag", "first", "", ""},
      {"other", "x", "", ""},
      {"tag", "second", "", ""},
  };

  Client cli(HOST, port);
  auto res = cli.Post("/repeated", items);
  ASSERT_TRUE(res);
  ASSERT_EQ(2U, values.size());
  EXPECT_EQ("first", values[0]);
  EXPECT_EQ("second", values[1]);
  EXPECT_EQ("first", first);
  EXPECT_EQ("second", second);

  // std::multimap already kept entries sharing a name in insertion order, so
  // everything above passes without this change too. The whole traversal is
  // what tells the two apart: sorting by name would hoist "other" to the front
  // and the two "tag" parts would end up adjacent.
  EXPECT_EQ("tag=first other=x tag=second ", order);

  // Advancing past the last entry of a name used to run off the container;
  // the container's saturating increment makes it return the default instead.
  EXPECT_EQ("", out_of_range);
}

TEST(MultipartFormDataTest, BackslashesInNamesSurvive) {
  Server svr;
  std::string file_names;
  svr.Post("/upload", [&](const Request &req, Response &res) {
    for (const auto &file : req.form.files) {
      file_names += file.first + "|" + file.second.filename + " ";
    }
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // A trailing backslash would otherwise escape the closing quote.
  UploadFormDataItems items = {
      {"dir\\", "x", "a.txt", "text/plain"},
      {"b", "y", "a\\\\b.txt", "text/plain"},
  };

  Client cli(HOST, port);
  auto res = cli.Post("/upload", items);
  ASSERT_TRUE(res);
  EXPECT_EQ("dir\\|a.txt b|a\\\\b.txt ", file_names);
}

TEST(MultipartOrderTest, ContentSurvivesContainerGrowth) {
  // Server::read_content() keeps a FormFields::iterator alive across the
  // content callbacks that fill the part it points at. The container is
  // vector-backed, so a later emplace can reallocate and invalidate an older
  // iterator; 64 parts grow the vector through seven reallocations, which
  // checks that every part's content still lands in its own entry.
  const size_t part_count = 64;

  // One formula for both the parts sent and the values expected back, so the
  // two cannot drift apart.
  auto name_of = [](size_t i) { return "f" + std::to_string(i); };
  auto content_of = [](size_t i) {
    return std::string(64, static_cast<char>('a' + (i % 26)));
  };

  Server svr;
  std::vector<std::pair<std::string, std::string>> received;
  svr.Post("/many", [&](const Request &req, Response &res) {
    for (const auto &field : req.form.fields) {
      received.emplace_back(field.first, field.second.content);
    }
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  UploadFormDataItems items;
  for (size_t i = 0; i < part_count; i++) {
    items.push_back({name_of(i), content_of(i), "", ""});
  }

  Client cli(HOST, port);
  auto res = cli.Post("/many", items);
  ASSERT_TRUE(res);
  ASSERT_EQ(part_count, received.size());
  for (size_t i = 0; i < part_count; i++) {
    EXPECT_EQ(name_of(i), received[i].first) << "part " << i;
    EXPECT_EQ(content_of(i), received[i].second) << "part " << i;
  }
}

TEST(ParseMultipartBoundaryTest, DefaultValue) {
  string content_type = "multipart/form-data; boundary=something";
  string boundary;
  auto ret = detail::parse_multipart_boundary(content_type, boundary);
  EXPECT_TRUE(ret);
  EXPECT_EQ(boundary, "something");
}

TEST(ParseMultipartBoundaryTest, ValueWithQuote) {
  string content_type = "multipart/form-data; boundary=\"gc0pJq0M:08jU534c0p\"";
  string boundary;
  auto ret = detail::parse_multipart_boundary(content_type, boundary);
  EXPECT_TRUE(ret);
  EXPECT_EQ(boundary, "gc0pJq0M:08jU534c0p");
}

TEST(ParseMultipartBoundaryTest, ValueWithCharset) {
  string content_type =
      "multipart/mixed; boundary=THIS_STRING_SEPARATES;charset=UTF-8";
  string boundary;
  auto ret = detail::parse_multipart_boundary(content_type, boundary);
  EXPECT_TRUE(ret);
  EXPECT_EQ(boundary, "THIS_STRING_SEPARATES");
}

TEST(ParseMultipartBoundaryTest, ValueWithQuotesAndCharset) {
  string content_type =
      "multipart/mixed; boundary=\"cpp-httplib-multipart-data\"; charset=UTF-8";
  string boundary;
  auto ret = detail::parse_multipart_boundary(content_type, boundary);
  EXPECT_TRUE(ret);
  EXPECT_EQ(boundary, "cpp-httplib-multipart-data");
}

TEST(ParseMultipartBoundaryTest, LongestAllowedValue) {
  const string boundary(70, 'a');
  string content_type = "multipart/form-data; boundary=" + boundary;
  string parsed;
  auto ret = detail::parse_multipart_boundary(content_type, parsed);
  EXPECT_TRUE(ret);
  EXPECT_EQ(parsed, boundary);
}

TEST(ParseMultipartBoundaryTest, ValueLongerThanRFCLimit) {
  // RFC 2046 5.1.1 caps a boundary at 70 characters.
  string content_type = "multipart/form-data; boundary=" + string(71, 'a');
  string parsed;
  auto ret = detail::parse_multipart_boundary(content_type, parsed);
  EXPECT_FALSE(ret);
}

TEST(ParseMultipartBoundaryTest, QuotedValueIsMeasuredAfterUnquoting) {
  // The limit applies to the unquoted value, so a quoted 70 character boundary
  // is 72 characters on the wire and still valid.
  const string boundary(70, 'a');
  string content_type = "multipart/form-data; boundary=\"" + boundary + "\"";
  string parsed;
  EXPECT_TRUE(detail::parse_multipart_boundary(content_type, parsed));
  EXPECT_EQ(parsed, boundary);

  content_type = "multipart/form-data; boundary=\"" + string(71, 'a') + "\"";
  parsed.clear();
  EXPECT_FALSE(detail::parse_multipart_boundary(content_type, parsed));
}

TEST(ParseMultipartBoundaryTest, QuotedValueWithEqualsSign) {
  // RFC 2046 5.1.1 allows '=' in a boundary, so a MIME sender has to quote it.
  // The parameter parser must not treat that '=' as the key/value separator.
  string content_type =
      "multipart/mixed; boundary=\"----=_NextPart_000_0000_01D9\"; "
      "charset=UTF-8";
  string parsed;
  EXPECT_TRUE(detail::parse_multipart_boundary(content_type, parsed));
  EXPECT_EQ(parsed, "----=_NextPart_000_0000_01D9");
}

TEST(ParseMultipartBoundaryTest, QuotedValueWithSemicolon) {
  // A ';' inside the quoted-string is part of the value, not a parameter
  // separator, so it must not truncate the boundary.
  string content_type = "multipart/mixed; boundary=\"a;b\"; charset=UTF-8";
  string parsed;
  EXPECT_TRUE(detail::parse_multipart_boundary(content_type, parsed));
  EXPECT_EQ(parsed, "a;b");
}

TEST(ParseMultipartBoundaryTest, QuotedPairsAreUnescaped) {
  string parsed;
  EXPECT_TRUE(detail::parse_multipart_boundary(
      "multipart/form-data; boundary=\"a\\\\b\"", parsed));
  EXPECT_EQ("a\\b", parsed);
  EXPECT_TRUE(detail::parse_multipart_boundary(
      "multipart/form-data; boundary=\"a\\\"b\"", parsed));
  EXPECT_EQ("a\"b", parsed);
}

TEST(ParseDispositionParamsTest, QuotedValues) {
  // RFC 9110 Section 5.6.6: a parameter value may be a quoted-string, and
  // ';' and '=' are ordinary characters inside one.
  struct {
    const char *value;
    std::vector<std::pair<const char *, const char *>> expected;
  } cases[] = {
      {"name=\"file1\"; filename=\"a.txt\"",
       {{"name", "file1"}, {"filename", "a.txt"}}},
      // Whitespace around '=' and ';' is still trimmed
      {"name=\"file2\" ;filename = \"a.html\"",
       {{"name", "file2"}, {"filename", "a.html"}}},
      // '=' inside the value used to leave only the text after the last one
      {"name=\"file1\"; filename=\"report=v2.pdf\"",
       {{"name", "file1"}, {"filename", "report=v2.pdf"}}},
      {"name=\"x=y\"", {{"name", "x=y"}}},
      // ';' inside the value used to truncate the pair and leave a bogus one
      {"name=\"file3\"; filename=\"a;b.txt\"",
       {{"name", "file3"}, {"filename", "a;b.txt"}}},
      // An unquoted value keeps working, and so does filename*
      {"filename*=UTF-8''%41.txt; filename=\"a.txt\"",
       {{"filename*", "UTF-8''%41.txt"}, {"filename", "a.txt"}}},
      // A parameter with no key is dropped rather than turned into one whose
      // key is the value
      {"=nokey; name=\"file5\"", {{"name", "file5"}}},
      // An escaped quote does not end the value
      {"name=\"a\\\"; filename=evil.php\"",
       {{"name", "a\"; filename=evil.php"}}},
      // Other backslashes, as in a Windows path, are kept
      {"name=\"f\"; filename=\"C:\\dir\\a.txt\"",
       {{"name", "f"}, {"filename", "C:\\dir\\a.txt"}}},
  };

  for (const auto &c : cases) {
    Params params;
    detail::parse_disposition_params(c.value, params);
    for (const auto &kv : c.expected) {
      auto it = params.find(kv.first);
      ASSERT_NE(it, params.end())
          << "value: " << c.value << ", key: " << kv.first;
      EXPECT_EQ(kv.second, it->second) << "value: " << c.value;
    }
    EXPECT_EQ(c.expected.size(), params.size()) << "value: " << c.value;
  }
}

TEST(MultipartFormDataTest, PartArrivingAByteAtATime) {
  Server svr;
  std::string filename;
  std::string content;
  svr.Post("/upload", [&](const Request &req, Response &) {
    const auto &file = req.form.get_file("file");
    filename = file.filename;
    content = file.content;
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  std::string body = "--B\r\n"
                     "Content-Disposition: form-data; name=\"file\"; "
                     "filename=\"a.txt\"\r\n"
                     "Content-Type: text/plain\r\n"
                     "\r\n"
                     "hello\r\n"
                     "--B--\r\n";
  Client cli(HOST, PORT);
  auto res = cli.Post(
      "/upload",
      [&](size_t offset, DataSink &sink) {
        if (offset < body.size()) {
          sink.write(&body[offset], 1);
        } else {
          sink.done();
        }
        return true;
      },
      "multipart/form-data; boundary=B");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("a.txt", filename);
  EXPECT_EQ("hello", content);
}

TEST(ParseDispositionParamsTest, QuotedValuesSurviveTheRoundTrip) {
  // escape_multipart_field() only escapes '"', CR and LF, so a name or
  // filename holding '=' or ';' reaches the server's parameter parser as is.
  Server svr;
  std::string field_value, file_name, file_filename;
  bool has_field = false, has_file = false;

  svr.Post("/quoted", [&](const Request &req, Response &res) {
    has_field = req.form.has_field("x=y");
    field_value = req.form.get_field("x=y");

    has_file = req.form.has_file("file1");
    const auto &file = req.form.get_file("file1");
    file_name = file.name;
    file_filename = file.filename;

    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  UploadFormDataItems items = {
      {"x=y", "field-value", "", ""},
      {"file1", "pdf-bytes", "a;b=report.pdf", "application/pdf"},
  };

  Client cli(HOST, port);
  auto res = cli.Post("/quoted", items);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  EXPECT_TRUE(has_field);
  EXPECT_EQ("field-value", field_value);

  EXPECT_TRUE(has_file);
  EXPECT_EQ("file1", file_name);
  EXPECT_EQ("a;b=report.pdf", file_filename);
}

TEST(GetHeaderValueTest, DefaultValue) {
  Headers headers = {{"Dummy", "Dummy"}};
  auto val = detail::get_header_value(headers, "Content-Type", "text/plain", 0);
  EXPECT_STREQ("text/plain", val);
}

TEST(GetHeaderValueTest, DefaultValueInt) {
  Headers headers = {{"Dummy", "Dummy"}};
  auto val = detail::get_header_value_u64(headers, "Content-Length", 100, 0);
  EXPECT_EQ(100ull, val);
}

TEST(GetHeaderValueTest, RegularValue) {
  Headers headers = {{"Content-Type", "text/html"}, {"Dummy", "Dummy"}};
  auto val = detail::get_header_value(headers, "Content-Type", "text/plain", 0);
  EXPECT_STREQ("text/html", val);
}

TEST(GetHeaderValueTest, RegularValueWithDifferentCase) {
  Headers headers = {{"Content-Type", "text/html"}, {"Dummy", "Dummy"}};
  auto val = detail::get_header_value(headers, "content-type", "text/plain", 0);
  EXPECT_STREQ("text/html", val);
}

TEST(GetHeaderValueTest, SetContent) {
  Response res;

  res.set_content("html", "text/html");
  EXPECT_EQ("text/html", res.get_header_value("Content-Type"));

  res.set_content("text", "text/plain");
  EXPECT_EQ(1U, res.get_header_value_count("Content-Type"));
  EXPECT_EQ("text/plain", res.get_header_value("Content-Type"));
}

TEST(GetHeaderValueTest, RegularValueInt) {
  Headers headers = {{"Content-Length", "100"}, {"Dummy", "Dummy"}};
  auto val = detail::get_header_value_u64(headers, "Content-Length", 0, 0);
  EXPECT_EQ(100ull, val);
}

TEST(GetHeaderValueTest, RegularInvalidValueInt) {
  Headers headers = {{"Content-Length", "x"}};
  auto is_invalid_value = false;
  auto val = detail::get_header_value_u64(headers, "Content-Length", 0, 0,
                                          is_invalid_value);
  EXPECT_EQ(0ull, val);
  EXPECT_TRUE(is_invalid_value);
}

TEST(GetHeaderValueTest, OutOfRangeValueInt) {
  // An all-digit value that overflows size_t must be reported as invalid, not
  // silently saturated/truncated: parsing at size_t width would otherwise wrap
  // a large length to a small one on 32-bit builds, leaving the framing length
  // wrong while is_invalid_value stayed false.
  Headers headers = {{"Content-Length", "99999999999999999999999999"}};
  auto is_invalid_value = false;
  detail::get_header_value_u64(headers, "Content-Length", 0, 0,
                               is_invalid_value);
  EXPECT_TRUE(is_invalid_value);

  // A well-formed length is unaffected.
  Headers ok = {{"Content-Length", "1234"}};
  is_invalid_value = false;
  auto val = detail::get_header_value_u64(ok, "Content-Length", 0, 0,
                                          is_invalid_value);
  EXPECT_EQ(1234ull, val);
  EXPECT_FALSE(is_invalid_value);
}

TEST(GetHeaderValueTest, Range) {
  {
    Headers headers = {make_range_header({{1, -1}})};
    auto val = detail::get_header_value(headers, "Range", 0, 0);
    EXPECT_STREQ("bytes=1-", val);
  }

  {
    Headers headers = {make_range_header({{-1, 1}})};
    auto val = detail::get_header_value(headers, "Range", 0, 0);
    EXPECT_STREQ("bytes=-1", val);
  }

  {
    Headers headers = {make_range_header({{1, 10}})};
    auto val = detail::get_header_value(headers, "Range", 0, 0);
    EXPECT_STREQ("bytes=1-10", val);
  }

  {
    Headers headers = {make_range_header({{1, 10}, {100, -1}})};
    auto val = detail::get_header_value(headers, "Range", 0, 0);
    EXPECT_STREQ("bytes=1-10, 100-", val);
  }

  {
    Headers headers = {make_range_header({{1, 10}, {100, 200}})};
    auto val = detail::get_header_value(headers, "Range", 0, 0);
    EXPECT_STREQ("bytes=1-10, 100-200", val);
  }

  {
    Headers headers = {make_range_header({{0, 0}, {-1, 1}})};
    auto val = detail::get_header_value(headers, "Range", 0, 0);
    EXPECT_STREQ("bytes=0-0, -1", val);
  }
}

TEST(BearerTokenAuthTest, SchemeValidation) {
  // A value shorter than "Bearer " must not throw from the fixed-length
  // substr, and a non-Bearer scheme must not be reported as a token.
  struct {
    const char *value;
    const char *expected;
  } cases[] = {
      {"x", ""},
      {"Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==", ""},
      {"Bearer abc123", "abc123"},
      {"bearer abc123", "abc123"}, // scheme match is case-insensitive
  };

  for (const auto &c : cases) {
    Request req;
    req.set_header("Authorization", c.value);
    EXPECT_EQ(c.expected, get_bearer_token_auth(req)) << "value: " << c.value;
  }
}

TEST(HeadersOrderTest, DuplicateFieldsKeepInsertionOrder) {
  // RFC 9110 5.3: the order of fields sharing a name is significant. This used
  // to depend on the standard library (libstdc++ handed back duplicates in
  // reverse insertion order, libc++ in insertion order).
  Request req;
  req.set_header("Accept-Encoding", "gzip");
  req.set_header("Accept-Encoding", "deflate");
  req.set_header("Accept-Encoding", "br");

  EXPECT_EQ(3U, req.get_header_value_count("Accept-Encoding"));
  EXPECT_EQ("gzip", req.get_header_value("Accept-Encoding"));
  EXPECT_EQ("gzip", req.get_header_value("Accept-Encoding", "", 0));
  EXPECT_EQ("deflate", req.get_header_value("Accept-Encoding", "", 1));
  EXPECT_EQ("br", req.get_header_value("Accept-Encoding", "", 2));
}

TEST(HeadersOrderTest, IdBeyondTheLastDuplicateYieldsDefault) {
  Request req;
  req.set_header("X-Test", "only");

  EXPECT_EQ("only", req.get_header_value("X-Test", "def", 0));
  EXPECT_EQ("def", req.get_header_value("X-Test", "def", 1));
  EXPECT_EQ("def", req.get_header_value("X-Test", "def", 99));
  EXPECT_EQ("def", req.get_header_value("X-Missing", "def", 3));
}

TEST(HeadersOrderTest, HugeIdYieldsDefault) {
  Request req;
  req.set_header("X-First", "1");
  req.set_header("X-Test", "2");
  req.params.emplace("first", "1");
  req.params.emplace("test", "2");
  req.form.fields.emplace("first", FormField{"first", "1", {}});
  req.form.fields.emplace("test", FormField{"test", "2", {}});
  req.form.files.emplace("first", FormData{"first", "1", "", "", {}});
  req.form.files.emplace("test", FormData{"test", "2", "", "", {}});

  // The second one is negative when read as a signed value
  const auto max_id = (std::numeric_limits<size_t>::max)();
  for (auto id : {max_id / 2, max_id}) {
    EXPECT_EQ("def", req.get_header_value("X-Test", "def", id));
    EXPECT_EQ(7U, req.get_header_value_u64("X-Test", 7, id));
    EXPECT_EQ("", req.get_param_value("test", id));
    EXPECT_EQ("", req.form.get_field("test", id));
    EXPECT_EQ("", req.form.get_file("test", id).content);
  }
}

TEST(HeadersOrderTest, TraversalFollowsInsertionOrder) {
  Headers headers;
  headers.emplace("Host", "example.com");
  headers.emplace("Accept-Encoding", "gzip");
  headers.emplace("User-Agent", "test");
  headers.emplace("Accept-Encoding", "deflate");

  EXPECT_EQ("Host=example.com Accept-Encoding=gzip User-Agent=test "
            "Accept-Encoding=deflate ",
            entries_to_string(headers));
}

TEST(HeadersOrderTest, LookupIsCaseInsensitiveAndPicksTheFirstField) {
  Headers headers = {{"Content-Type", "text/html"},
                     {"CONTENT-TYPE", "text/xml"}};

  EXPECT_EQ(2U, headers.count("content-type"));
  auto it = headers.find("content-type");
  ASSERT_TRUE(it != headers.end());
  EXPECT_EQ("text/html", it->second);
}

TEST(HeadersOrderTest, ErasingAnEqualRangeSparesInterleavedFields) {
  // The fields sharing a name are not adjacent, so an equal_range() erase must
  // drop only those fields and leave everything positioned between them.
  Headers headers = {{"A", "1"}, {"X", "x"}, {"A", "2"},
                     {"Y", "y"}, {"A", "3"}, {"Z", "z"}};

  auto rng = headers.equal_range("a");
  headers.erase(rng.first, rng.second);

  EXPECT_EQ("X=x Y=y Z=z ", entries_to_string(headers));
}

TEST(HeadersOrderTest, ErasingByNameKeepsTheRemainingOrder) {
  Headers headers = {
      {"A", "1"}, {"B", "2"}, {"a", "3"}, {"C", "4"}, {"A", "5"}};

  EXPECT_EQ(3U, headers.erase("A"));
  EXPECT_EQ(0U, headers.count("A"));
  EXPECT_EQ("B=2 C=4 ", entries_to_string(headers));
}

TEST(HeadersOrderTest, EmplaceFrontPrepends) {
  Headers headers = {{"Accept", "*/*"}, {"User-Agent", "test"}};
  headers.emplace_front("Host", "example.com");

  EXPECT_EQ("Host=example.com Accept=*/* User-Agent=test ",
            entries_to_string(headers));
}

TEST(ParseHeaderValueTest, Range) {
  {
    Ranges ranges;
    auto ret = detail::parse_range_header("bytes=1-", ranges);
    EXPECT_TRUE(ret);
    EXPECT_EQ((Ranges{{1, -1}}), ranges);
  }

  {
    Ranges ranges;
    auto ret = detail::parse_range_header("bytes=-1", ranges);
    EXPECT_TRUE(ret);
    EXPECT_EQ((Ranges{{-1, 1}}), ranges);
  }

  {
    Ranges ranges;
    auto ret = detail::parse_range_header("bytes=1-10", ranges);
    EXPECT_TRUE(ret);
    EXPECT_EQ((Ranges{{1, 10}}), ranges);
  }

  {
    Ranges ranges;
    auto ret = detail::parse_range_header("bytes=10-1", ranges);
    EXPECT_FALSE(ret);
  }

  {
    Ranges ranges;
    auto ret = detail::parse_range_header("bytes=1-10, 100-", ranges);
    EXPECT_TRUE(ret);
    EXPECT_EQ((Ranges{{1, 10}, {100, -1}}), ranges);
  }

  {
    Ranges ranges;
    auto ret =
        detail::parse_range_header("bytes=1-10, 100-200, 300-400", ranges);
    EXPECT_TRUE(ret);
    EXPECT_EQ((Ranges{{1, 10}, {100, 200}, {300, 400}}), ranges);
  }

  {
    Ranges ranges;

    EXPECT_FALSE(detail::parse_range_header("bytes", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=0", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=-", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes= ", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=,", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=,,", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=,,,", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=a-b", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=1-0", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=0--1", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=0- 1", ranges));
    EXPECT_FALSE(detail::parse_range_header("bytes=0 -1", ranges));
    // Overflows ssize_t; must not be read as the suffix range "bytes=-100".
    EXPECT_FALSE(
        detail::parse_range_header("bytes=9223372036854775808-100", ranges));
    EXPECT_TRUE(ranges.empty());
  }

  {
    // RFC 9110 14.1.2: a last-byte-pos greater than the content length is the
    // remainder of the representation, so it stays accepted.
    Ranges ranges;
    auto ret =
        detail::parse_range_header("bytes=0-99999999999999999999", ranges);
    EXPECT_TRUE(ret);
    ASSERT_EQ(1u, ranges.size());
    EXPECT_EQ(0, ranges[0].first);
    EXPECT_EQ(-1, ranges[0].second);
  }

  // RFC 9110 14.1: range unit names are case-insensitive.
  for (const auto &s : {"Bytes=1-10", "BYTES=1-10", "bYtEs=1-10"}) {
    Ranges ranges;
    EXPECT_TRUE(detail::parse_range_header(s, ranges)) << s;
    EXPECT_EQ((Ranges{{1, 10}}), ranges) << s;
  }
}

TEST(ParseAcceptEncoding1, AcceptEncoding) {
  Request req;
  req.set_header("Accept-Encoding", "gzip");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Gzip);
#else
  EXPECT_TRUE(ret == detail::EncodingType::None);
#endif
}

TEST(ParseAcceptEncoding2, AcceptEncoding) {
  Request req;
  req.set_header("Accept-Encoding", "gzip, deflate, br, zstd");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Brotli);
#elif CPPHTTPLIB_ZLIB_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Gzip);
#elif CPPHTTPLIB_ZSTD_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Zstd);
#else
  EXPECT_TRUE(ret == detail::EncodingType::None);
#endif
}

TEST(ParseAcceptEncoding3, AcceptEncoding) {
  Request req;
  req.set_header("Accept-Encoding",
                 "br;q=1.0, gzip;q=0.8, zstd;q=0.8, *;q=0.1");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Brotli);
#elif CPPHTTPLIB_ZLIB_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Gzip);
#elif CPPHTTPLIB_ZSTD_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Zstd);
#else
  EXPECT_TRUE(ret == detail::EncodingType::None);
#endif
}

TEST(ParseAcceptEncoding4, AcceptEncodingQZero) {
  // All supported encodings rejected with q=0 should return None
  Request req;
  req.set_header("Accept-Encoding", "gzip;q=0, br;q=0, zstd;q=0, deflate");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

  EXPECT_TRUE(ret == detail::EncodingType::None);
}

TEST(ParseAcceptEncoding5, AcceptEncodingQZeroVariants) {
  // q=0.0, q=0.00, q=0.000 should also be treated as rejected
  Request req;
  req.set_header("Accept-Encoding", "gzip;q=0.000, br;q=0.0, zstd;q=0.00");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

  EXPECT_TRUE(ret == detail::EncodingType::None);
}

TEST(ParseAcceptEncodingTest, RejectsTrailingQualityCharacters) {
  Request req;
  req.set_header("Accept-Encoding", "gzip;q=0.5junk");

  Response res;
  res.set_header("Content-Type", "text/plain");

  EXPECT_EQ(detail::EncodingType::None, detail::encoding_type(req, res));
}

TEST(ParseAcceptEncoding6, AcceptEncodingXGzipQZero) {
  // x-gzip;q=0 should not cause "gzip" to be incorrectly detected
  Request req;
  req.set_header("Accept-Encoding", "x-gzip;q=0");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

  EXPECT_TRUE(ret == detail::EncodingType::None);
}

TEST(ParseAcceptEncoding7, AcceptEncodingCaseInsensitive) {
  // RFC 7231: Accept-Encoding values are case-insensitive
  Request req;
  req.set_header("Accept-Encoding", "GZIP, BR, ZSTD");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Brotli);
#elif CPPHTTPLIB_ZLIB_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Gzip);
#elif CPPHTTPLIB_ZSTD_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Zstd);
#else
  EXPECT_TRUE(ret == detail::EncodingType::None);
#endif
}

TEST(ParseAcceptEncoding8, AcceptEncodingQValuePriority) {
  // q value should determine priority, not hardcoded order
  Request req;
  req.set_header("Accept-Encoding", "br;q=0.5, gzip;q=1.0, zstd;q=0.8");

  Response res;
  res.set_header("Content-Type", "text/plain");

  auto ret = detail::encoding_type(req, res);

  // gzip has highest q=1.0, so it should be selected even though
  // br and zstd are also supported
#ifdef CPPHTTPLIB_ZLIB_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Gzip);
#elif CPPHTTPLIB_ZSTD_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Zstd);
#elif CPPHTTPLIB_BROTLI_SUPPORT
  EXPECT_TRUE(ret == detail::EncodingType::Brotli);
#else
  EXPECT_TRUE(ret == detail::EncodingType::None);
#endif
}

TEST(BufferStreamTest, read) {
  detail::BufferStream strm1;
  Stream &strm = strm1;

  EXPECT_EQ(5, strm.write("hello"));

  char buf[512];
  EXPECT_EQ(2, strm.read(buf, 2));
  EXPECT_EQ('h', buf[0]);
  EXPECT_EQ('e', buf[1]);

  EXPECT_EQ(2, strm.read(buf, 2));
  EXPECT_EQ('l', buf[0]);
  EXPECT_EQ('l', buf[1]);

  EXPECT_EQ(1, strm.read(buf, 1));
  EXPECT_EQ('o', buf[0]);

  EXPECT_EQ(0, strm.read(buf, 1));
}

TEST(HostnameToIPConversionTest, HTTPWatch_Online) {
  auto host = "www.httpwatch.com";

  auto ip = hosted_at(host);
  EXPECT_EQ("23.96.13.243", ip);

  std::vector<std::string> addrs;
  hosted_at(host, addrs);
  EXPECT_EQ(1u, addrs.size());
}

#if 0 // It depends on each test environment...
TEST(HostnameToIPConversionTest, YouTube_Online) {
  auto host = "www.youtube.com";

  std::vector<std::string> addrs;
  hosted_at(host, addrs);

  EXPECT_EQ(20u, addrs.size());

  auto it = std::find(addrs.begin(), addrs.end(), "2607:f8b0:4006:809::200e");
  EXPECT_TRUE(it != addrs.end());
}
#endif

class ChunkedEncodingTest : public ::testing::Test {
protected:
  ChunkedEncodingTest()
      : cli_(HOST, PORT)
#ifdef CPPHTTPLIB_SSL_ENABLED
        ,
        svr_(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE)
#endif
  {
    cli_.set_connection_timeout(2);
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli_.enable_server_certificate_verification(false);
#endif
  }

  virtual void SetUp() {
    read_file("./image.jpg", image_data_);

    svr_.Get("/hi", [&](const Request & /*req*/, Response &res) {
      res.set_content("Hello World!", "text/plain");
    });

    svr_.Get(
        "/chunked", [this](const httplib::Request &, httplib::Response &res) {
          res.set_chunked_content_provider(
              "image/jpeg", [this](size_t offset, httplib::DataSink &sink) {
                size_t remaining = image_data_.size() - offset;
                if (remaining == 0) {
                  sink.done();
                } else {
                  constexpr size_t CHUNK_SIZE = 1024;
                  size_t send_size = std::min(CHUNK_SIZE, remaining);
                  sink.write(&image_data_[offset], send_size);

                  std::this_thread::sleep_for(std::chrono::milliseconds(10));
                }
                return true;
              });
        });

    t_ = thread([&]() { ASSERT_TRUE(svr_.listen(HOST, PORT)); });

    svr_.wait_until_ready();
  }

  virtual void TearDown() {
    svr_.stop();
    if (!request_threads_.empty()) {
      std::this_thread::sleep_for(std::chrono::seconds(1));
      for (auto &t : request_threads_) {
        t.join();
      }
    }
    t_.join();
  }

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli_;
  SSLServer svr_;
#else
  Client cli_;
  Server svr_;
#endif
  thread t_;
  std::vector<thread> request_threads_;
  std::string image_data_;
};

TEST_F(ChunkedEncodingTest, NormalGet) {
  auto res = cli_.Get("/chunked");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string out;
  read_file("./image.jpg", out);

  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(out, res->body);
}

TEST_F(ChunkedEncodingTest, WithContentReceiver) {
  std::string body;
  auto res = cli_.Get("/chunked", [&](const char *data, size_t data_length) {
    body.append(data, data_length);
    return true;
  });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string out;
  read_file("./image.jpg", out);

  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(out, body);
}

TEST_F(ChunkedEncodingTest, WithResponseHandlerAndContentReceiver) {
  std::string body;
  auto res = cli_.Get(
      "/chunked",
      [&](const Response &response) {
        EXPECT_EQ(StatusCode::OK_200, response.status);
        return true;
      },
      [&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string out;
  read_file("./image.jpg", out);

  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(out, body);
}

TEST(RangeTest, FromHTTPBin_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/range/32"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif
  cli.set_connection_timeout(5);

  {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("abcdefghijklmnopqrstuvwxyzabcdef", res->body);
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    Headers headers = {make_range_header({{1, -1}})};
    auto res = cli.Get(path, headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("bcdefghijklmnopqrstuvwxyzabcdef", res->body);
    EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  }

  {
    Headers headers = {make_range_header({{1, 10}})};
    auto res = cli.Get(path, headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("bcdefghijk", res->body);
    EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  }

  // go-httpbin (httpbingo.org) returns 206 even when the range covers the
  // entire resource, while the original httpbin returned 200. Both are
  // acceptable per RFC 9110 §15.3.7, so we accept either status code.
  {
    Headers headers = {make_range_header({{0, 31}})};
    auto res = cli.Get(path, headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("abcdefghijklmnopqrstuvwxyzabcdef", res->body);
    EXPECT_TRUE(res->status == StatusCode::OK_200 ||
                res->status == StatusCode::PartialContent_206);
  }

  {
    Headers headers = {make_range_header({{0, -1}})};
    auto res = cli.Get(path, headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("abcdefghijklmnopqrstuvwxyzabcdef", res->body);
    EXPECT_TRUE(res->status == StatusCode::OK_200 ||
                res->status == StatusCode::PartialContent_206);
  }

  // go-httpbin returns 206 with clamped range for over-range requests,
  // while the original httpbin returned 416. Both behaviors are observed
  // in real servers, so we only verify the request succeeds.
  {
    Headers headers = {make_range_header({{0, 32}})};
    auto res = cli.Get(path, headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  }
}

TEST(RangeTest, IgnoredForPost) {
  Server svr;
  svr.Post("/", [](const Request &, Response &res) {
    res.set_content("abcdefg", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  for (auto range : {"bytes=1-2", "bytes=x"}) {
    auto res = cli.Post("/", Headers{{"Range", range}});
    ASSERT_TRUE(res) << range << ": " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status) << range;
    EXPECT_EQ("abcdefg", res->body) << range;
  }
}

TEST(GetAddrInfoDanglingRefTest, LongTimeout) {
  auto host = "unresolvableaddress.local";
  auto path = std::string{"/"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif
  cli.set_connection_timeout(1);

  {
    auto res = cli.Get(path);
    ASSERT_FALSE(res);
  }

  std::this_thread::sleep_for(std::chrono::seconds(8));
}

#if defined(__linux__) && defined(__GLIBC__) &&                                \
    defined(CPPHTTPLIB_USE_NON_BLOCKING_GETADDRINFO)

// Forward declaration: in split builds split.py strips `inline` and moves the
// definition into httplib.cc, so detail::getaddrinfo_with_timeout is not
// visible from the public httplib.h. Re-declaring it here lets the tests link
// against the symbol in both header-only and split builds.
namespace httplib {
namespace detail {
int getaddrinfo_with_timeout(const char *node, const char *service,
                             const struct addrinfo *hints,
                             struct addrinfo **res, time_t timeout_sec);
} // namespace detail
} // namespace httplib

// Reproducer for https://github.com/yhirose/cpp-httplib/issues/2431.
//
// On Linux/glibc, getaddrinfo_with_timeout() runs the lookup via
// getaddrinfo_a(GAI_NOWAIT) using a stack-local `struct gaicb`. When the
// gai_suspend() call hits the connection timeout the function calls
// gai_cancel() and returns immediately. gai_cancel() is non-blocking and
// can return EAI_NOTCANCELED, in which case the resolver worker thread is
// still alive and still references the now-destroyed stack frame.
//
// Triggering the bug requires DNS to actually hang (UDP/53 dropped, etc.),
// so these tests are gated on CPPHTTPLIB_TEST_ISSUE_2431=1 and are skipped
// during normal runs. test/run_issue_2431_repro.sh sets up the environment
// and runs them in a container.
namespace {
bool should_run_issue_2431_tests() {
  const char *v = getenv("CPPHTTPLIB_TEST_ISSUE_2431");
  return v && *v && std::string(v) != "0";
}

std::string unique_unresolvable_host(int n) {
  // .invalid is reserved (RFC 6761) and is never served by real DNS, but
  // glibc still asks the configured nameserver — which is exactly the path
  // we want to exercise. A unique label per call avoids the resolver cache.
  auto t = std::chrono::steady_clock::now().time_since_epoch().count();
  return "h-" + std::to_string(::getpid()) + "-" + std::to_string(t) + "-" +
         std::to_string(n) + ".invalid";
}
} // namespace

TEST(GetAddrInfoAsyncCancelTest, DirectCallSingleThread) {
  if (!should_run_issue_2431_tests()) {
    GTEST_SKIP()
        << "Set CPPHTTPLIB_TEST_ISSUE_2431=1 (and sinkhole DNS) to run";
  }

  for (int i = 0; i < 8; ++i) {
    struct addrinfo hints;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;

    auto host = unique_unresolvable_host(i);
    struct addrinfo *result = nullptr;
    int rc = detail::getaddrinfo_with_timeout(host.c_str(), "80", &hints,
                                              &result, /*timeout_sec=*/1);
    if (rc == 0 && result) { freeaddrinfo(result); }
  }

  // Give orphaned getaddrinfo_a worker threads a chance to write into the
  // stack region they still believe holds their gaicb.
  std::this_thread::sleep_for(std::chrono::seconds(3));
}

TEST(GetAddrInfoAsyncCancelTest, DirectCallMultiThread) {
  if (!should_run_issue_2431_tests()) {
    GTEST_SKIP()
        << "Set CPPHTTPLIB_TEST_ISSUE_2431=1 (and sinkhole DNS) to run";
  }

  std::atomic<bool> stop{false};
  std::vector<std::thread> threads;
  for (int t = 0; t < 8; ++t) {
    threads.emplace_back([t, &stop] {
      int i = 0;
      while (!stop.load(std::memory_order_relaxed)) {
        struct addrinfo hints;
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;

        auto host = unique_unresolvable_host(t * 100000 + i++);
        struct addrinfo *result = nullptr;
        int rc = detail::getaddrinfo_with_timeout(host.c_str(), "80", &hints,
                                                  &result, /*timeout_sec=*/1);
        if (rc == 0 && result) { freeaddrinfo(result); }
      }
    });
  }

  std::this_thread::sleep_for(std::chrono::seconds(8));
  stop.store(true, std::memory_order_relaxed);
  for (auto &th : threads) {
    th.join();
  }
  std::this_thread::sleep_for(std::chrono::seconds(3));
}

TEST(GetAddrInfoAsyncCancelTest, ClientGetMultiThread) {
  if (!should_run_issue_2431_tests()) {
    GTEST_SKIP()
        << "Set CPPHTTPLIB_TEST_ISSUE_2431=1 (and sinkhole DNS) to run";
  }

  std::atomic<bool> stop{false};
  std::vector<std::thread> threads;
  for (int t = 0; t < 8; ++t) {
    threads.emplace_back([t, &stop] {
      int i = 0;
      while (!stop.load(std::memory_order_relaxed)) {
        auto host = unique_unresolvable_host(t * 100000 + i++);
        Client cli(host, 80);
        cli.set_connection_timeout(1, 0);
        cli.set_read_timeout(1, 0);
        cli.set_write_timeout(1, 0);
        (void)cli.Get("/");
      }
    });
  }

  std::this_thread::sleep_for(std::chrono::seconds(8));
  stop.store(true, std::memory_order_relaxed);
  for (auto &th : threads) {
    th.join();
  }
  std::this_thread::sleep_for(std::chrono::seconds(3));
}

#endif // __linux__ && __GLIBC__ && CPPHTTPLIB_USE_NON_BLOCKING_GETADDRINFO

TEST(ConnectionErrorTest, InvalidHost) {
  auto host = "-abcde.com";

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif
  cli.set_connection_timeout(std::chrono::seconds(2));

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Connection, res.error());
}

TEST(ConnectionErrorTest, InvalidHost2) {
  auto host = "httpcan.org/";

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif
  cli.set_connection_timeout(std::chrono::seconds(2));

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Connection, res.error());
}

TEST(ConnectionErrorTest, InvalidHostCheckResultErrorToString) {
  auto host = "httpcan.org/";

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif
  cli.set_connection_timeout(std::chrono::seconds(2));

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  stringstream s;
  s << "error code: " << res.error();
  EXPECT_EQ("error code: Could not establish connection (2)", s.str());
}

TEST(ConnectionErrorTest, InvalidPort) {
  auto host = "localhost";
  auto port = 44380;

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host, port);
#else
  Client cli(host, port);
#endif
  cli.set_connection_timeout(std::chrono::seconds(2));

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_TRUE(Error::Connection == res.error() ||
              Error::ConnectionTimeout == res.error());
}

TEST(ConnectionErrorTest, Timeout_Online) {
  auto host = "google.com";

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 44380;
  SSLClient cli(host, port);
#else
  auto port = 8080;
  Client cli(host, port);
#endif
  cli.set_connection_timeout(std::chrono::seconds(2));

  // only probe one address type so that the error reason
  // correlates to the timed-out IPv4, not the unsupported
  // IPv6 connection attempt
  cli.set_address_family(AF_INET);

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::ConnectionTimeout, res.error());
}

TEST(CancelTest, NoCancel_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/range/32"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res = cli.Get(path, [](uint64_t, uint64_t) { return true; });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("abcdefghijklmnopqrstuvwxyzabcdef", res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(CancelTest, WithCancelSmallPayload_Online) {
  // Use /bytes with a large payload so that the DownloadProgress callback
  // (which only fires for Content-Length responses) is invoked before the
  // entire body is received, giving cancellation a chance to fire.
  auto host = "httpbingo.org";
  auto path = std::string{"/bytes/524288"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif

  auto res = cli.Get(path, [](uint64_t, uint64_t) { return false; });
  cli.set_connection_timeout(std::chrono::seconds(5));
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, WithCancelLargePayload_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/bytes/524288"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif
  cli.set_connection_timeout(std::chrono::seconds(5));

  uint32_t count = 0;
  auto res =
      cli.Get(path, [&count](uint64_t, uint64_t) { return (count++ == 0); });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, NoCancelPost) {
  Server svr;

  svr.Post("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Post("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
               "application/json", [](uint64_t, uint64_t) { return true; });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("Hello World!", res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(CancelTest, WithCancelSmallPayloadPost) {
  Server svr;

  svr.Post("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Post("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
               "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, WithCancelLargePayloadPost) {
  Server svr;
  svr.set_payload_max_length(200 * 1024 * 1024);

  svr.Post("/", [&](const Request & /*req*/, Response &res) {
    res.set_content(LARGE_DATA, "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_payload_max_length(200 * 1024 * 1024);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Post("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
               "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, NoCancelPut) {
  Server svr;

  svr.Put("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Put("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
              "application/json", [](uint64_t, uint64_t) { return true; });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("Hello World!", res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(CancelTest, WithCancelSmallPayloadPut) {
  Server svr;

  svr.Put("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Put("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
              "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, WithCancelLargePayloadPut) {
  Server svr;
  svr.set_payload_max_length(200 * 1024 * 1024);

  svr.Put("/", [&](const Request & /*req*/, Response &res) {
    res.set_content(LARGE_DATA, "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_payload_max_length(200 * 1024 * 1024);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Put("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
              "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, NoCancelPatch) {
  Server svr;

  svr.Patch("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Patch("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
                "application/json", [](uint64_t, uint64_t) { return true; });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("Hello World!", res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(CancelTest, WithCancelSmallPayloadPatch) {
  Server svr;

  svr.Patch("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Patch("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
                "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, WithCancelLargePayloadPatch) {
  Server svr;
  svr.set_payload_max_length(200 * 1024 * 1024);

  svr.Patch("/", [&](const Request & /*req*/, Response &res) {
    res.set_content(LARGE_DATA, "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_payload_max_length(200 * 1024 * 1024);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Patch("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
                "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, NoCancelDelete) {
  Server svr;

  svr.Delete("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Delete("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
                 "application/json", [](uint64_t, uint64_t) { return true; });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("Hello World!", res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(CancelTest, WithCancelSmallPayloadDelete) {
  Server svr;

  svr.Delete("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Delete("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
                 "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST(CancelTest, WithCancelLargePayloadDelete) {
  Server svr;
  svr.set_payload_max_length(200 * 1024 * 1024);

  svr.Delete("/", [&](const Request & /*req*/, Response &res) {
    res.set_content(LARGE_DATA, "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_payload_max_length(200 * 1024 * 1024);
  cli.set_connection_timeout(std::chrono::seconds(5));

  auto res =
      cli.Delete("/", Headers(), JSON_DATA.data(), JSON_DATA.size(),
                 "application/json", [](uint64_t, uint64_t) { return false; });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

static std::string remove_whitespace(const std::string &input) {
  std::string output;
  output.reserve(input.size());
  std::copy_if(input.begin(), input.end(), std::back_inserter(output),
               [](unsigned char c) { return !std::isspace(c); });
  return output;
}

TEST(BaseAuthTest, FromHTTPWatch_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/basic-auth/hello/world"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  auto port = 443;
  SSLClient cli(host, port);
#else
  auto port = 80;
  Client cli(host, port);
#endif

  {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }

  {
    auto res = cli.Get(
        path, Headers{make_basic_authentication_header("hello", "world")});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    auto body = remove_whitespace(res->body);
    EXPECT_TRUE(body.find("\"authenticated\":true") != std::string::npos);
    EXPECT_TRUE(body.find("\"user\":\"hello\"") != std::string::npos);
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    cli.set_basic_auth("hello", "world");
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    auto body = remove_whitespace(res->body);
    EXPECT_TRUE(body.find("\"authenticated\":true") != std::string::npos);
    EXPECT_TRUE(body.find("\"user\":\"hello\"") != std::string::npos);
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    cli.set_basic_auth("hello", "bad");
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }

  {
    cli.set_basic_auth("bad", "world");
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(DigestAuthTest, FromHTTPWatch_Online) {
  auto host = "httpbingo.org";
  auto unauth_path = std::string{"/digest-auth/auth/hello/world"};
  auto paths = std::vector<std::string>{
      "/digest-auth/auth/hello/world/MD5",
      "/digest-auth/auth/hello/world/SHA-256",
  };

  auto port = 443;
  SSLClient cli(host, port);

  {
    auto res = cli.Get(unauth_path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  }

  {

    cli.set_digest_auth("hello", "world");
    for (const auto &path : paths) {
      auto res = cli.Get(path.c_str());
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      auto body = remove_whitespace(res->body);
      EXPECT_TRUE(body.find("\"authenticated\":true") != std::string::npos);
      EXPECT_TRUE(body.find("\"user\":\"hello\"") != std::string::npos);
      EXPECT_EQ(StatusCode::OK_200, res->status);
    }

    cli.set_digest_auth("hello", "bad");
    for (const auto &path : paths) {
      auto res = cli.Get(path.c_str());
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
    }
  }
}

// RFC 9110 Section 11.6.1: a WWW-Authenticate field value is a
// comma-separated list of challenges, and each challenge may itself carry a
// comma-separated auth-param list, so a server can legally offer Basic
// before Digest, either as two field lines or packed into one. Runs one 401
// -> Digest-retry round trip with the given field lines (get_combined_header_
// value() joins them in receipt order) and checks that the retry carries a
// well-formed Digest Authorization header naming expected_realm.
static void
run_digest_challenge_list_test(const std::vector<std::string> &challenges,
                               const std::string &expected_realm) {
  std::atomic<int> hits{0};

  Server svr;
  svr.Get("/x", [&](const Request &req, Response &res) {
    if (++hits == 1) {
      res.status = StatusCode::Unauthorized_401;
      for (const auto &challenge : challenges) {
        res.set_header("WWW-Authenticate", challenge);
      }
    } else {
      auto authorization = req.get_header_value("Authorization");
      EXPECT_EQ(0u, authorization.rfind("Digest ", 0));
      EXPECT_NE(std::string::npos,
                authorization.find("realm=\"" + expected_realm + "\""));
      EXPECT_EQ(std::string::npos, authorization.find("Basic"));
      res.set_content("ok", "text/plain");
    }
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_digest_auth("hello", "world");
  auto res = cli.Get("/x");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  EXPECT_EQ(2, hits.load());
}

static const char *kBasicChallenge = "Basic realm=\"decoy\"";
static const char *kDigestChallenge =
    "Digest realm=\"testrealm\", qop=\"auth\", nonce=\"abc123\", "
    "algorithm=MD5";

TEST(DigestAuthTest, BasicChallengeListedBeforeDigest) {
  run_digest_challenge_list_test({kBasicChallenge, kDigestChallenge},
                                 "testrealm");
}

// Same challenge list with the schemes in the opposite order, to make sure
// the fix above didn't just special-case "Basic first".
TEST(DigestAuthTest, DigestChallengeListedBeforeBasic) {
  run_digest_challenge_list_test({kDigestChallenge, kBasicChallenge},
                                 "testrealm");
}

// A comma inside a quoted auth-param value must not be mistaken for the
// separator between two challenges (or two auth-params).
TEST(DigestAuthTest, RealmContainingCommaIsNotSplit) {
  run_digest_challenge_list_test(
      {"Digest realm=\"test,realm\", qop=\"auth\", nonce=\"abc123\", "
       "algorithm=MD5"},
      "test,realm");
}

// RFC 7616 3.4: uri is the request-target as sent, which is encoded, carries
// the params and leaves out the fragment.
TEST(DigestAuthTest, UriIsTheRequestTargetSent) {
  Server svr;
  std::string uri, target;
  svr.Get("/a b", [&](const Request &req, Response &res) {
    auto auth = req.get_header_value("Authorization");
    if (auth.empty()) {
      res.status = StatusCode::Unauthorized_401;
      res.set_header("WWW-Authenticate",
                     "Digest realm=\"r\", qop=\"auth\", nonce=\"n\"");
      return;
    }
    auto b = auth.find("uri=\"") + 5;
    uri = auth.substr(b, auth.find('"', b) - b);
    target = req.target;
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_digest_auth("hello", "world");
  auto res = cli.Get("/a b#f", Params{{"x", "1"}}, Headers{});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("/a%20b?x=1", target);
  EXPECT_EQ(target, uri);
}

// RFC 7616 Section 3.3 requires realm and nonce on every Digest challenge.
// make_digest_authentication_header() dereferences both unconditionally, so
// a server sending a challenge missing either one must not be treated as
// usable -- doing so used to crash the client with std::out_of_range.
static void run_digest_challenge_missing_field_test(const char *challenge) {
  Server svr;
  svr.Get("/x", [&](const Request & /*req*/, Response &res) {
    res.status = StatusCode::Unauthorized_401;
    res.set_header("WWW-Authenticate", challenge);
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_digest_auth("hello", "world");
  auto res = cli.Get("/x");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
}

TEST(DigestAuthTest, ChallengeMissingRealmAndNonceDoesNotCrash) {
  run_digest_challenge_missing_field_test("Digest qop=\"auth\"");
}

TEST(DigestAuthTest, ChallengeMissingNonceDoesNotCrash) {
  run_digest_challenge_missing_field_test("Digest realm=\"r\", qop=\"auth\"");
}

TEST(DigestAuthTest, ChallengeMissingRealmDoesNotCrash) {
  run_digest_challenge_missing_field_test("Digest nonce=\"n\", qop=\"auth\"");
}

// A hostile server can put a '"' in realm/nonce/opaque, or a non-token
// algorithm, in its challenge. parse_www_authenticate() de-escapes quoted-pairs
// when storing the values, so the header builder has to re-escape them (and
// keep algorithm a bare token); otherwise the value breaks out of its
// quoted-string and injects extra auth-params into the client's Authorization.
TEST(DigestAuthTest, EscapesInjectedAuthParams) {
  std::atomic<int> hits{0};
  std::string authorization;

  Server svr;
  svr.Get("/x", [&](const Request &req, Response &res) {
    if (++hits == 1) {
      res.status = StatusCode::Unauthorized_401;
      // On the wire the quotes embedded in the values are backslash-escaped.
      res.set_header("WWW-Authenticate",
                     "Digest realm=\"testrealm\", "
                     "nonce=\"n\\\"; injected=\\\"x\", "
                     "algorithm=\"MD5, injected2=\\\"y\\\"\", qop=\"auth\"");
    } else {
      authorization = req.get_header_value("Authorization");
      res.set_content("ok", "text/plain");
    }
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_digest_auth("hello", "world");
  auto res = cli.Get("/x");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(2, hits.load());

  EXPECT_EQ(0u, authorization.rfind("Digest ", 0));
  // The nonce (de-escaped to  n"; injected="x ) must be re-escaped so it stays
  // inside its quoted-string rather than starting an "injected" auth-param.
  EXPECT_NE(std::string::npos,
            authorization.find("nonce=\"n\\\"; injected=\\\"x\""));
  // A non-token algorithm falls back to a bare MD5 token, dropping the payload.
  EXPECT_EQ(std::string::npos, authorization.find("injected2"));
}

#endif

TEST(SpecifyServerIPAddressTest, AnotherHostname_Online) {
  auto host = "google.com";
  auto another_host = "example.com";
  auto wrong_ip = "0.0.0.0";

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_hostname_addr_map({{another_host, wrong_ip}});
  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

TEST(SpecifyServerIPAddressTest, RealHostname_Online) {
  auto host = "google.com";
  auto wrong_ip = "0.0.0.0";

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_hostname_addr_map({{host, wrong_ip}});
  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Connection, res.error());
}

TEST(SpecifyServerIPAddressTest, HostnameAsAddrMapValue) {
  // A mapped value that is not an IP literal must be resolved. "localhost"
  // resolves from the hosts file, so this test needs no external DNS.
  // "target.invalid" (RFC 6761) is only a map key and the Host header value.
  auto host = "target.invalid";

  Server svr;
  std::string received_host;
  svr.Get("/hi", [&](const Request &req, Response &res) {
    received_host = req.get_header_value("Host");
    res.set_content("Hello World!", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(host, port);
  cli.set_hostname_addr_map({{host, HOST}});

  auto res = cli.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  // The mapping only redirects the connection; the identity stays host_.
  EXPECT_EQ(std::string(host) + ":" + std::to_string(port), received_host);
}

TEST(SpecifyServerIPAddressTest, IPAddressAsAddrMapValue) {
  // A mapped value that is an IP literal keeps the AI_NUMERICHOST path.
  auto host = "target.invalid";

  Server svr;
  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  auto thread = std::thread([&]() { svr.listen_after_bind(); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(host, port);
  cli.set_hostname_addr_map({{host, "127.0.0.1"}});

  auto res = cli.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(SpecifyServerIPAddressTest, EmptyAddrMapValueIsIgnored) {
  // An empty mapped value must leave host_ as the connection target. Without
  // that guard the empty value would become the host argument, getaddrinfo
  // would be called with a null node, and (no AI_PASSIVE) it would resolve to
  // loopback - silently connecting somewhere the caller never asked for.
  // The server listens on loopback, so such a fallback would succeed and is
  // therefore observable as a failure of this test.
  auto blackhole = "192.0.2.1"; // TEST-NET-1, never routable

  Server svr;
  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(blackhole, port);
  cli.set_hostname_addr_map({{blackhole, ""}});
  cli.set_connection_timeout(1);

  auto res = cli.Get("/hi");
  EXPECT_FALSE(res) << "empty mapping must not redirect to loopback";
}

TEST(AbsoluteRedirectTest, Redirect_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/absolute-redirect/3"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_follow_location(true);
  auto res = cli.Get(path);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(RedirectTest, Redirect_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/redirect/3"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_follow_location(true);
  auto res = cli.Get(path);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(RelativeRedirectTest, Redirect_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/relative-redirect/3"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_follow_location(true);
  auto res = cli.Get(path);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(TooManyRedirectTest, Redirect_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/redirect/21"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_follow_location(true);
  auto res = cli.Get(path);
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::ExceedRedirectCount, res.error());
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(YahooRedirectTest, Redirect_Online) {
  Client cli("yahoo.com");

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);

  cli.set_follow_location(true);
  res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("https://www.yahoo.com/", res->location);
}

// Previously "nghttp2.org" "/httpbin/redirect-to"
#define REDIR_HOST "httpbingo.org"
#define REDIR_PATH "/redirect-to"

TEST(HttpsToHttpRedirectTest, Redirect_Online) {
  SSLClient cli(REDIR_HOST);
  cli.set_follow_location(true);
  auto res =
      cli.Get(REDIR_PATH "?url=http%3A%2F%2Fexample.com&status_code=302");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(HttpsToHttpRedirectTest2, Redirect_Online) {
  SSLClient cli(REDIR_HOST);
  cli.set_follow_location(true);

  Params params;
  params.emplace("url", "http://example.com");
  params.emplace("status_code", "302");

  auto res = cli.Get(REDIR_PATH, params, Headers{});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(HttpsToHttpRedirectTest3, Redirect_Online) {
  SSLClient cli(REDIR_HOST);
  cli.set_follow_location(true);

  Params params;
  params.emplace("url", "http://example.com");

  auto res = cli.Get(REDIR_PATH "?status_code=302", params, Headers{});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(UrlWithSpace, Redirect_Online) {
  SSLClient cli("edge.forgecdn.net");
  cli.set_follow_location(true);

  auto res = cli.Get("/files/2595/310/Neat 1.4-17.jar");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(18527U, res->get_header_value_u64("Content-Length"));
}
#endif

#if !defined(_WIN32) && !defined(_WIN64)
TEST(ReceiveSignals, Signal) {
  auto setupSignalHandlers = []() {
    struct sigaction act;

    sigemptyset(&act.sa_mask);
    act.sa_flags = SA_SIGINFO;
    act.sa_sigaction = [](int sig, siginfo_t *, void *) {
      switch (sig) {
      case SIGINT:
      default: break;
      }
    };
    ::sigaction(SIGINT, &act, nullptr);
  };

  Server svr;
  int port = 0;
  auto thread = std::thread([&]() {
    setupSignalHandlers();
    port = svr.bind_to_any_port(HOST);
    svr.listen_after_bind();
  });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  ASSERT_TRUE(svr.is_running());
  pthread_kill(thread.native_handle(), SIGINT);
  std::this_thread::sleep_for(std::chrono::milliseconds(100));
  ASSERT_TRUE(svr.is_running());
}
#endif

TEST(RedirectToDifferentPort, Redirect) {
  Server svr1;
  svr1.Get("/1", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  int svr1_port = 0;
  auto thread1 = std::thread([&]() {
    svr1_port = svr1.bind_to_any_port(HOST);
    svr1.listen_after_bind();
  });

  Server svr2;
  svr2.Get("/2", [&](const Request & /*req*/, Response &res) {
    res.set_redirect("http://localhost:" + std::to_string(svr1_port) + "/1");
  });

  int svr2_port = 0;
  auto thread2 = std::thread([&]() {
    svr2_port = svr2.bind_to_any_port(HOST);
    svr2.listen_after_bind();
  });
  auto se = detail::scope_exit([&] {
    svr2.stop();
    thread2.join();
    svr1.stop();
    thread1.join();
    ASSERT_FALSE(svr2.is_running());
    ASSERT_FALSE(svr1.is_running());
  });

  svr1.wait_until_ready();
  svr2.wait_until_ready();

  Client cli("localhost", svr2_port);
  cli.set_follow_location(true);

  auto res = cli.Get("/2");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("Hello World!", res->body);
}

// GET /redir on one server redirects to /target on another port, so the
// client follows it with a new client.
static Result
GetThroughRedirectToDifferentPort(Server::Handler target,
                                  const std::function<void(Client &)> &setup,
                                  const Headers &headers = Headers()) {
  Server target_svr;
  target_svr.Get("/target", target);

  int target_port = 0;
  auto target_thread = std::thread([&]() {
    target_port = target_svr.bind_to_any_port(HOST);
    target_svr.listen_after_bind();
  });

  Server origin_svr;
  origin_svr.Get("/redir", [&](const Request &, Response &res) {
    res.set_redirect(
        "http://localhost:" + std::to_string(target_port) + "/target", 302);
  });

  int origin_port = 0;
  auto origin_thread = std::thread([&]() {
    origin_port = origin_svr.bind_to_any_port(HOST);
    origin_svr.listen_after_bind();
  });
  auto se = detail::scope_exit([&] {
    origin_svr.stop();
    origin_thread.join();
    target_svr.stop();
    target_thread.join();
  });

  target_svr.wait_until_ready();
  origin_svr.wait_until_ready();

  Client cli("localhost", origin_port);
  cli.set_follow_location(true);
  setup(cli);
  return cli.Get("/redir", headers);
}

static void
TestDoNotForwardCredentialsOnRedirect(std::function<void(Client &)> set_auth) {
  std::string captured_authorization;
  auto result = GetThroughRedirectToDifferentPort(
      [&](const Request &req, Response &res) {
        captured_authorization = req.get_header_value("Authorization");
        res.set_content("OK", "text/plain");
      },
      set_auth);
  ASSERT_TRUE(result) << "Error: " << to_string(result.error());
  EXPECT_EQ(StatusCode::OK_200, result->status);
  // RFC 9110: credentials MUST NOT be forwarded to a different host
  EXPECT_TRUE(captured_authorization.empty());
}

TEST(RedirectToDifferentPort, DoNotForwardCredentialsBasicAuth) {
  TestDoNotForwardCredentialsOnRedirect(
      [](Client &cli) { cli.set_basic_auth("admin", "secret"); });
}

TEST(RedirectToDifferentPort, DoNotForwardCredentialsBearerToken) {
  TestDoNotForwardCredentialsOnRedirect(
      [](Client &cli) { cli.set_bearer_token_auth("my-secret-token"); });
}

TEST(RedirectToDifferentPort, DoNotForwardCookie) {
  std::string captured_cookie;
  auto result = GetThroughRedirectToDifferentPort(
      [&](const Request &req, Response &res) {
        captured_cookie = req.get_header_value("Cookie");
        res.set_content("OK", "text/plain");
      },
      [](Client &) {}, {{"Cookie", "session_id=SECRET; auth=PRIVATE"}});
  ASSERT_TRUE(result) << "Error: " << to_string(result.error());
  EXPECT_EQ(StatusCode::OK_200, result->status);
  // Cookie MUST NOT be forwarded to a different host (GHSA-22mf-w2v3-r2jv)
  EXPECT_TRUE(captured_cookie.empty());
}

TEST(RedirectToSamePort, ForwardCookie) {
  // A same-origin redirect (same scheme/host/port) should preserve the Cookie
  // header so that ordinary session flows keep working.
  Server svr;
  std::string captured_cookie;
  svr.Get("/redir", [&](const Request & /*req*/, Response &res) {
    res.set_redirect("/target", 302);
  });
  svr.Get("/target", [&](const Request &req, Response &res) {
    captured_cookie = req.get_header_value("Cookie");
    res.set_content("OK", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_follow_location(true);

  Headers headers = {{"Cookie", "session_id=SECRET"}};
  auto res = cli.Get("/redir", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("session_id=SECRET", captured_cookie);
}

TEST(RedirectToDifferentPort, ForwardDefaultHeadersButNotCredentials) {
  std::string authorization;
  std::string trace_id;
  auto result = GetThroughRedirectToDifferentPort(
      [&](const Request &req, Response &res) {
        authorization = req.get_header_value("Authorization");
        trace_id = req.get_header_value("X-Trace-Id");
        res.set_content("OK", "text/plain");
      },
      [](Client &cli) {
        cli.set_default_headers(
            {{"Authorization", "Bearer SECRET"}, {"X-Trace-Id", "42"}});
      });
  ASSERT_TRUE(result) << "Error: " << to_string(result.error());
  EXPECT_EQ(StatusCode::OK_200, result->status);
  // Like a header given with the request, a default one goes along unless it
  // carries credentials (RFC 9110 15.4).
  EXPECT_TRUE(authorization.empty());
  EXPECT_EQ("42", trace_id);
}

TEST(RedirectToDifferentPort, KeepPayloadMaxLength) {
  auto result = GetThroughRedirectToDifferentPort(
      [](const Request &, Response &res) {
        res.set_content(std::string(2048, 'x'), "text/plain");
      },
      [](Client &cli) { cli.set_payload_max_length(1024); });
  EXPECT_FALSE(result);
}

TEST(RedirectToDifferentPort, KeepMaxTimeout) {
  auto result = GetThroughRedirectToDifferentPort(
      [](const Request &req, Response &res) {
        // Answer after a second, or once the client gives up.
        for (auto i = 0; i < 100 && !req.is_connection_closed(); i++) {
          std::this_thread::sleep_for(std::chrono::milliseconds(10));
        }
        res.set_content("late", "text/plain");
      },
      [](Client &cli) { cli.set_max_timeout(std::chrono::milliseconds(200)); });
  ASSERT_FALSE(result);
  EXPECT_EQ(Error::Read, result.error());
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(RedirectToDifferentPort, DoNotAnswerChallengeFromRedirectTarget) {
  auto result = GetThroughRedirectToDifferentPort(
      [](const Request &, Response &res) {
        res.status = StatusCode::Unauthorized_401;
        res.set_header("WWW-Authenticate",
                       "Digest realm=\"r\", nonce=\"n\", qop=\"auth\"");
      },
      [](Client &cli) { cli.set_digest_auth("user", "pass"); });
  ASSERT_TRUE(result) << "Error: " << to_string(result.error());
  EXPECT_EQ(StatusCode::Unauthorized_401, result->status);
}
#endif

TEST(RedirectToDifferentPort, OverflowPortNumber) {
  Server svr;
  svr.Get("/redir", [&](const Request & /*req*/, Response &res) {
    // Port number that overflows int — should not crash
    res.set_redirect("http://localhost:99999999999999999999/target");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_follow_location(true);

  auto res = cli.Get("/redir");
  // Should fail gracefully, not crash (no valid response due to bad port)
  EXPECT_FALSE(res);
}

TEST(RedirectToDifferentPort, TrailingCharactersInPort) {
  Server svr;
  auto port = svr.bind_to_any_port(HOST);
  svr.Get("/redir", [&](const Request & /*req*/, Response &res) {
    // The server's own port followed by junk must not be followed
    res.set_redirect("http://" + std::string(HOST) + ":" +
                     std::to_string(port) + "junk/target");
  });
  svr.Get("/target", [&](const Request & /*req*/, Response &res) {
    res.set_content("target", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_follow_location(true);

  auto res = cli.Get("/redir");
  EXPECT_FALSE(res);
}

TEST(RedirectTest, OtherStatusesWithLocationAreNotFollowed) {
  Server svr;
  std::atomic<bool> followed{false};

  svr.Get("/304", [](const Request & /*req*/, Response &res) {
    res.status = StatusCode::NotModified_304;
    res.set_header("Location", "/target");
  });

  svr.Get("/305", [](const Request & /*req*/, Response &res) {
    res.status = StatusCode::UseProxy_305;
    res.set_header("Location", "/target");
  });

  svr.Get("/target", [&](const Request & /*req*/, Response &res) {
    followed = true;
    res.set_content("target", "text/plain");
  });

  auto th = std::thread([&]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    th.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);
  cli.set_follow_location(true);

  auto res = cli.Get("/304");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotModified_304, res->status);

  res = cli.Get("/305");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::UseProxy_305, res->status);

  EXPECT_FALSE(followed);
}

TEST(RedirectFromPageWithContent, Redirect) {
  Server svr;

  svr.Get("/1", [&](const Request & /*req*/, Response &res) {
    res.set_content("___", "text/plain");
    res.set_redirect("/2");
  });

  svr.Get("/2", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto th = std::thread([&]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    th.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli("localhost", PORT);
    cli.set_follow_location(true);

    std::string body;
    auto res = cli.Get("/1", [&](const char *data, size_t data_length) {
      body.append(data, data_length);
      return true;
    });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Hello World!", body);
  }

  {
    Client cli("localhost", PORT);

    std::string body;
    auto res = cli.Get("/1", [&](const char *data, size_t data_length) {
      body.append(data, data_length);
      return true;
    });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Found_302, res->status);
    EXPECT_EQ("___", body);
  }
}

// A server can close the connection after a request with "Connection: close"
// without repeating the option in its response (RFC 9112 Section 9.6), so the
// redirected request must go out on a new connection.
TEST(RedirectTest, NewConnectionAfterConnectionClose) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
  default_socket_options(srv);

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
  ASSERT_EQ(0, ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
  ASSERT_EQ(0, ::listen(srv, 2));

  auto send_text = [](socket_t sock, const std::string &text) {
    ::send(sock,
#ifdef _WIN32
           static_cast<const char *>(text.c_str()),
           static_cast<int>(text.size()),
#else
           text.c_str(), text.size(),
#endif
           0);
  };

  auto reused = false;
  auto server_thread = std::thread([&] {
    char buf[4096];
    auto first = ::accept(srv, nullptr, nullptr);
    if (first == INVALID_SOCKET) { return; }
    detail::set_socket_opt_time(first, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    ::recv(first, buf, sizeof(buf), 0);
    send_text(
        first,
        "HTTP/1.1 302 Found\r\nLocation: /2\r\nContent-Length: 0\r\n\r\n");

    auto next = first;
    if (::recv(first, buf, sizeof(buf), 0) > 0) {
      reused = true;
    } else {
      detail::close_socket(first);
      next = ::accept(srv, nullptr, nullptr);
      if (next == INVALID_SOCKET) { return; }
      detail::set_socket_opt_time(next, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
      ::recv(next, buf, sizeof(buf), 0);
    }
    send_text(next, "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n"
                    "Connection: close\r\n\r\nok");
    detail::close_socket(next);
  });

  Client cli("127.0.0.1", PORT + 2);
  cli.set_follow_location(true);
  cli.set_read_timeout(5, 0);
  auto res = cli.Get("/1");

  server_thread.join();
  detail::close_socket(srv);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("ok", res->body);
  EXPECT_FALSE(reused);
}

TEST(RedirectFromPageWithContentIP6, Redirect) {
  Server svr;

  auto port_str = std::to_string(PORT);
  auto redirect_url = "http://[::1]:" + port_str + "/2";
  auto expected_host = "[::1]:" + port_str;

  svr.Get("/1", [&](const Request & /*req*/, Response &res) {
    res.set_content("___", "text/plain");
    // res.set_redirect("/2");
    res.set_redirect(redirect_url);
  });

  svr.Get("/2", [&](const Request &req, Response &res) {
    auto host_header = req.headers.find("Host");
    ASSERT_TRUE(host_header != req.headers.end());
    EXPECT_EQ(expected_host, host_header->second);

    res.set_content("Hello World!", "text/plain");
  });

  auto th = std::thread([&]() { svr.listen("::1", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    th.join();
    ASSERT_FALSE(svr.is_running());
  });

  // When IPV6 support isn't available svr.listen("::1", PORT) never
  // actually starts anything, so the condition !svr.is_running() will
  // always remain true, and the loop never stops.
  // This basically counts how many milliseconds have passed since the
  // call to svr.listen(), and if after 5 seconds nothing started yet
  // aborts the test.
  for (unsigned int milliseconds = 0; !svr.is_running(); milliseconds++) {
    std::this_thread::sleep_for(std::chrono::milliseconds(1));
    ASSERT_LT(milliseconds, 5000U);
  }

  {
    Client cli("::1", PORT);
    cli.set_follow_location(true);

    std::string body;
    auto res = cli.Get("/1", [&](const char *data, size_t data_length) {
      body.append(data, data_length);
      return true;
    });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Hello World!", body);
  }

  {
    Client cli("::1", PORT);

    std::string body;
    auto res = cli.Get("/1", [&](const char *data, size_t data_length) {
      body.append(data, data_length);
      return true;
    });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Found_302, res->status);
    EXPECT_EQ("___", body);
  }
}

TEST(PathUrlEncodeTest, PathUrlEncode) {
  Server svr;

  svr.Get("/foo", [](const Request &req, Response &res) {
    auto a = req.params.find("a");
    if (a != req.params.end()) {
      res.set_content((*a).second, "text/plain");
      res.status = StatusCode::OK_200;
    } else {
      res.status = StatusCode::BadRequest_400;
    }
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_path_encode(false);

    auto res = cli.Get("/foo?a=explicitly+encoded");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    // This expects it back with a space, as the `+` won't have been
    // url-encoded, and server-side the params get decoded turning `+`
    // into spaces.
    EXPECT_EQ("explicitly encoded", res->body);
  }
}

TEST(PathUrlEncodeTest, PreEncodedQueryNotReencoded) {
  // When path encoding is disabled the client must transmit the supplied
  // query verbatim. Decoding-then-re-encoding it (the previous behavior)
  // corrupts pre-encoded binary payloads: e.g. `%20` would be turned into
  // `+`, which a strict RFC 3986 server decodes back as `+` (0x2B) rather
  // than a space (0x20). Assert on the raw wire target to catch this.
  Server svr;

  const std::string expected_target = "/foo?q=a%20b%2Cc%24d%3Bx&a=%00%FF";

  svr.Get("/foo", [&](const Request &req, Response &res) {
    EXPECT_EQ(expected_target, req.target);
    res.status = StatusCode::OK_200;
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_path_encode(false);

    auto res = cli.Get(expected_target.c_str());
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(PathUrlEncodeTest, StreamingMatchesBufferedTarget) {
  // `open_stream()` used to skip the path encoding that the buffered send
  // path applies, so the same `path` produced different bytes in the request
  // line depending on which API was used. Assert the two agree.
  Server svr;

  std::string target;
  svr.Get(".*", [&](const Request &req, Response &res) {
    target = req.target;
    res.status = StatusCode::OK_200;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  struct {
    const char *path;
    const char *expected;
  } cases[] = {
      {"/a b?x=1", "/a%20b?x=1"},
      {"/\xE6\x97\xA5\xE6\x9C\xAC", "/%E6%97%A5%E6%9C%AC"},
      {"/a,b;c+d", "/a%2Cb%3Bc%2Bd"},
  };

  for (const auto &c : cases) {
    Client cli(HOST, port);

    target.clear();
    auto res = cli.Get(c.path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(c.expected, target) << "buffered path: " << c.path;
    auto buffered_target = target;

    target.clear();
    auto handle = cli.open_stream("GET", c.path);
    EXPECT_TRUE(handle.is_valid())
        << "streaming path: " << c.path << ", " << to_string(handle.error);
    EXPECT_EQ(buffered_target, target) << "streaming path: " << c.path;
  }
}

TEST(PathUrlEncodeTest, StreamingPreEncodedQueryNotReencoded) {
  // The `set_path_encode(false)` contract — transmit the supplied target
  // verbatim — must hold for the streaming API too.
  Server svr;

  const std::string expected_target = "/foo?q=a%20b%2Cc%24d%3Bx&a=%00%FF";

  std::string target;
  svr.Get("/foo", [&](const Request &req, Response &res) {
    target = req.target;
    res.status = StatusCode::OK_200;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);
    cli.set_path_encode(false);

    auto handle = cli.open_stream("GET", expected_target);
    EXPECT_TRUE(handle.is_valid()) << to_string(handle.error);
    EXPECT_EQ(expected_target, target);
  }
}

TEST(PathUrlEncodeTest, StreamingCRLFInTargetIsEncoded) {
  // With path encoding enabled a CR/LF in the target is percent-encoded
  // rather than rejected, matching the buffered send path. The CR/LF guard in
  // write_request_line still backstops `set_path_encode(false)`, which is
  // covered by StreamingCRLFRejectedWhenPathEncodeDisabled.
  Server svr;

  // Captured before routing: the decoded path contains a newline, which a
  // `.*` handler pattern would not match (`.` excludes `\n` in std::regex).
  std::string target;
  svr.set_pre_routing_handler([&](const Request &req, Response &res) {
    target = req.target;
    res.status = StatusCode::OK_200;
    return Server::HandlerResponse::Handled;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);

    auto handle = cli.open_stream("GET", "/a\r\nX-Injected: 1");
    EXPECT_TRUE(handle.is_valid()) << to_string(handle.error);
    EXPECT_EQ("/a%0D%0AX-Injected:%201", target);
  }
}

TEST(PathUrlEncodeTest, ControlCharsInPathAreEncoded) {
  // Every control character is percent-encoded, not just CR/LF, so the target
  // passes the request-target check in write_request_line.
  Server svr;

  std::string target;
  svr.set_pre_routing_handler([&](const Request &req, Response &res) {
    target = req.target;
    res.status = StatusCode::OK_200;
    return Server::HandlerResponse::Handled;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);

    auto res = cli.Get("/a\tb\x1b\x7f");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("/a%09b%1B%7F", target);
  }
}

TEST(PathUrlEncodeTest, StreamingCRLFRejectedWhenPathEncodeDisabled) {
  // Nothing may reach the wire: a raw CR/LF target would split the request
  // line and inject headers.
  Server svr;

  // Pre-routing so that "not called" means nothing reached the server at all,
  // rather than merely failing to match a handler pattern.
  auto handler_called = false;
  svr.set_pre_routing_handler([&](const Request & /*req*/, Response &res) {
    handler_called = true;
    res.status = StatusCode::OK_200;
    return Server::HandlerResponse::Handled;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);
    cli.set_path_encode(false);

    auto handle = cli.open_stream("GET", "/a\r\nX-Injected: 1");
    EXPECT_FALSE(handle.is_valid());
    EXPECT_EQ(Error::Write, handle.error);
    EXPECT_FALSE(handler_called);
  }
}

TEST(PathUrlEncodeTest, RequestParamsBranchSelection) {
  // Which of the two branches runs is decided by whether the query component
  // is empty, not by whether `req.path` contains a `?`: a trailing `?` yields
  // an empty query and must still fall back to building one from
  // `req.params`, while a non-empty query must win over `req.params`.
  Server svr;

  std::string target;
  svr.Get("/foo", [&](const Request &req, Response &res) {
    target = req.target;
    res.status = StatusCode::OK_200;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    // Trailing `?` -> empty query component -> `req.params` is used.
    Client cli(HOST, port);

    Request req;
    req.method = "GET";
    req.path = "/foo?";
    req.params.emplace("a", "1");

    target.clear();
    auto res = cli.send(req);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("/foo?a=1", target);
  }

  {
    // Non-empty query in `req.path` -> `req.params` is not appended.
    Client cli(HOST, port);

    Request req;
    req.method = "GET";
    req.path = "/foo?b=2";
    req.params.emplace("a", "1");

    target.clear();
    auto res = cli.send(req);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("/foo?b=2", target);
  }
}

TEST(PathUrlEncodeTest, IncludePercentEncodingLF) {
  Server svr;

  svr.Get("/", [](const Request &req, Response &) {
    EXPECT_EQ("\x0A", req.get_param_value("something"));
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_path_encode(false);

    auto res = cli.Get("/?something=%0A");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(BindServerTest, BindDualStack) {
  Server svr;

  svr.Get("/1", [&](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen("::", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli("127.0.0.1", PORT);

    auto res = cli.Get("/1");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Hello World!", res->body);
  }
  {
    Client cli("::1", PORT);

    auto res = cli.Get("/1");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Hello World!", res->body);
  }
}

TEST(BindServerTest, BindAndListenSeparately) {
  Server svr;
  int port = svr.bind_to_any_port("0.0.0.0");
  ASSERT_TRUE(svr.is_valid());
  ASSERT_TRUE(port > 0);
  svr.stop();
}

// Reports whether anything is still listening on a loopback port. A plain
// connect() is used instead of a Client request because a socket left bound by
// mistake accepts the connection into its backlog and never answers, which
// would hang the test instead of failing it.
static bool is_loopback_port_accepting(int port) {
  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(port));
  addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

  socket_t sock = ::socket(AF_INET, SOCK_STREAM, 0);
  EXPECT_NE(sock, INVALID_SOCKET);
  if (sock == INVALID_SOCKET) { return false; }

  auto ret = ::connect(sock, reinterpret_cast<sockaddr *>(&addr),
                       static_cast<socklen_t>(sizeof(addr)));
  detail::close_socket(sock);
  return ret == 0;
}

TEST(BindServerTest, StopClosesBoundSocketWithoutListen) {
  Server svr;
  auto port = svr.bind_to_any_port("127.0.0.1");
  ASSERT_TRUE(port > 0);
  svr.stop();

  // bind_to_any_port() already called listen(2), so until stop() closed the
  // descriptor the port kept accepting connections into the backlog. ASSERT
  // rather than EXPECT: with the socket still open, the listen_after_bind()
  // below blocks forever in the accept loop.
  ASSERT_FALSE(is_loopback_port_accepting(port));

  // Nothing is left to accept on, so listen_after_bind() must report failure
  // instead of returning success without ever serving.
  EXPECT_FALSE(svr.listen_after_bind());

  // The failed listen marks the server decommissioned, so a waiter returns
  // instead of spinning forever.
  svr.wait_until_ready();
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(BindServerTest, BindAndListenSeparatelySSL) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE,
                CLIENT_CA_CERT_DIR);
  int port = svr.bind_to_any_port("0.0.0.0");
  ASSERT_TRUE(svr.is_valid());
  ASSERT_TRUE(port > 0);
  svr.stop();
}

// SSLServer::is_valid() overrides the base version, so it has to chain to it
// or a rejected CustomRoute() registration would not stop the server binding.
TEST(BindServerTest, SSLServerIsInvalidAfterRejectedCustomRoute) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE,
                CLIENT_CA_CERT_DIR);
  ASSERT_TRUE(svr.is_valid());

  svr.CustomRoute("GET", "/x", [](const Request &, Response &) {});

  EXPECT_FALSE(svr.is_valid());
  EXPECT_TRUE(svr.bind_to_any_port("0.0.0.0") < 0);
}

TEST(BindServerTest, BindAndListenSeparatelySSLEncryptedKey) {
  SSLServer svr(SERVER_ENCRYPTED_CERT_FILE, SERVER_ENCRYPTED_PRIVATE_KEY_FILE,
                nullptr, nullptr, SERVER_ENCRYPTED_PRIVATE_KEY_PASS);
  int port = svr.bind_to_any_port("0.0.0.0");
  ASSERT_TRUE(svr.is_valid());
  ASSERT_TRUE(port > 0);
  svr.stop();
}

TEST(BindServerTest, UpdateCertsPem) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  int port = svr.bind_to_any_port("0.0.0.0");
  ASSERT_TRUE(svr.is_valid());
  ASSERT_TRUE(port > 0);

  // Read PEM files
  std::string cert_pem, key_pem, ca_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);
  read_file(CLIENT_CA_CERT_FILE, ca_pem);

  // Update server certificates using PEM API
  ASSERT_TRUE(
      svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str(), ca_pem.c_str()));

  ASSERT_TRUE(svr.is_valid());
  svr.stop();
}

TEST(SSLClientServerTest, UpdateCertsPemWithClientAuth) {
  // Start server with client CA (enables client auth)
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());

  bool handler_called = false;
  svr.Get("/test", [&](const Request &req, Response &res) {
    handler_called = true;
    // Verify client certificate is present
    auto cert = req.peer_cert();
    EXPECT_TRUE(static_cast<bool>(cert));
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Read PEM files
  std::string cert_pem, key_pem, ca_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);
  read_file(CLIENT_CA_CERT_FILE, ca_pem);

  // Update server certificates and client CA using PEM API while server running
  ASSERT_TRUE(
      svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str(), ca_pem.c_str()));

  // Connect with client certificate
  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_TRUE(handler_called);
  EXPECT_EQ("ok", res->body);
}

// Puts a CA that did not sign the client's certificate in the old one's place.
static bool replace_client_ca(SSLServer &svr) {
  std::string cert_pem, key_pem, ca_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);
  read_file(SERVER_CERT2_FILE, ca_pem);
  return svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str(),
                              ca_pem.c_str());
}

TEST(SSLClientServerTest, UpdateCertsPemReplacesClientCA) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  auto get = [] {
    SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
    cli.enable_server_certificate_verification(false);
    return cli.Get("/test");
  };
  ASSERT_TRUE(get());

  ASSERT_TRUE(replace_client_ca(svr));
  EXPECT_FALSE(get());
}

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
TEST(SSLClientServerTest, ThrowingVerifyCallbackRejectsTheCertificate) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  tls::set_verify_callback(svr.tls_context(),
                           [](const tls::VerifyContext &) -> bool {
                             throw std::runtime_error("verify");
                           });
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  auto get = [] {
    SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
    cli.enable_server_certificate_verification(false);
    return cli.Get("/test");
  };
  EXPECT_FALSE(get());

  // The handshake is over, so an update does not wait for it.
  std::string cert_pem, key_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);
  EXPECT_TRUE(svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str()));

  tls::set_verify_callback(svr.tls_context(), [](const tls::VerifyContext &v) {
    return v.preverify_ok;
  });
  auto res = get();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("ok", res->body);
}
#endif

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
// Sends each request over a new connection with a client certificate,
// resuming the session of the one before when there is one.
class ResumingClient {
public:
  ResumingClient() : ctx_(SSL_CTX_new(TLS_client_method())) {
    SSL_CTX_use_certificate_file(ctx_, CLIENT_CERT_FILE, SSL_FILETYPE_PEM);
    SSL_CTX_use_PrivateKey_file(ctx_, CLIENT_PRIVATE_KEY_FILE,
                                SSL_FILETYPE_PEM);

    // BoringSSL hands out a resumable TLS 1.3 session only through this
    // callback, not through SSL_get1_session().
    SSL_CTX_set_app_data(ctx_, this);
    SSL_CTX_set_session_cache_mode(ctx_, SSL_SESS_CACHE_CLIENT |
                                             SSL_SESS_CACHE_NO_INTERNAL_STORE);
    SSL_CTX_sess_set_new_cb(ctx_, [](SSL *ssl, SSL_SESSION *session) {
      auto self = static_cast<ResumingClient *>(
          SSL_CTX_get_app_data(SSL_get_SSL_CTX(ssl)));
      SSL_SESSION_free(self->session_);
      self->session_ = session;
      return 1; // Keeps the reference
    });
  }
  ~ResumingClient() {
    SSL_SESSION_free(session_);
    SSL_CTX_free(ctx_);
  }

  // Tells whether the request was answered.
  bool get() {
    auto error = Error::Success;
    auto sock = detail::create_client_socket(
        HOST, "", PORT, AF_UNSPEC, false, false, nullptr,
        /*connection_timeout_sec=*/5, 0,
        /*read_timeout_sec=*/5, 0,
        /*write_timeout_sec=*/5, 0, std::string(), error);
    if (sock == INVALID_SOCKET) { return false; }
    auto sock_se = detail::scope_exit([&] { detail::close_socket(sock); });

    auto ssl = SSL_new(ctx_);
    auto ssl_se = detail::scope_exit([&] { SSL_free(ssl); });
    SSL_set_fd(ssl, static_cast<int>(sock));
    if (session_) { SSL_set_session(ssl, session_); }
    if (SSL_connect(ssl) != 1) { return false; }
    reused_ = SSL_session_reused(ssl) == 1;

    // Reading the response also takes in a TLS 1.3 session ticket.
    std::string req = "GET /test HTTP/1.1\r\nHost: x\r\n"
                      "Connection: close\r\n\r\n";
    SSL_write(ssl, req.data(), static_cast<int>(req.size()));
    std::string res;
    char buf[256];
    int n;
    while ((n = SSL_read(ssl, buf, sizeof(buf))) > 0) {
      res.append(buf, static_cast<size_t>(n));
    }

    // Without a proper shutdown, OpenSSL marks the session not resumable.
    SSL_shutdown(ssl);
    return res.find("200 OK") != std::string::npos;
  }

  // Whether the last connection resumed a session
  bool reused() const { return reused_; }

private:
  SSL_CTX *ctx_;
  SSL_SESSION *session_ = nullptr;
  bool reused_ = false;
};

// A client that resumes its session gets through, but not once the client CA
// has changed, as a resumed session does not show the certificate again.
TEST(SSLClientServerTest, ClientResumesSessionUntilClientCAChanges) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  ResumingClient cli;
  ASSERT_TRUE(cli.get());
  ASSERT_TRUE(cli.get());
  EXPECT_TRUE(cli.reused());

  ASSERT_TRUE(replace_client_ca(svr));
  EXPECT_FALSE(cli.get());
}

// A resumed session does not show the certificate again, so the server does
// not resume one with a verify callback to run on it.
TEST(SSLClientServerTest, NoSessionResumptionWithVerifyCallback) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  tls::set_verify_callback(svr.tls_context(), [](const tls::VerifyContext &v) {
    return v.preverify_ok;
  });
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  ResumingClient cli;
  ASSERT_TRUE(cli.get());
  ASSERT_TRUE(cli.get());
  EXPECT_FALSE(cli.reused());
}
#endif

#ifdef CPPHTTPLIB_WOLFSSL_SUPPORT
// wolfSSL shares its session cache between contexts, so a resumed session
// could carry a client certificate checked against another server's CA, or
// against a client CA since replaced.
TEST(SSLClientServerTest, ClientSessionIsNotResumedPastItsCA) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  // Trusts a CA that did not sign the client's certificate.
  SSLServer other(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, SERVER_CERT2_FILE);
  ASSERT_TRUE(other.is_valid());
  for (auto s : {&svr, &other}) {
    s->Get("/test", [](const Request &, Response &res) {
      res.set_content("ok", "text/plain");
    });
  }

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  thread t2 = thread([&]() { ASSERT_TRUE(other.listen(HOST, PORT + 1)); });
  auto se = detail::scope_exit([&] {
    other.stop();
    svr.stop();
    t2.join();
    t.join();
  });
  svr.wait_until_ready();
  other.wait_until_ready();

  auto ctx = wolfSSL_CTX_new(wolfTLSv1_2_client_method());
  auto ctx_se = detail::scope_exit([&] { wolfSSL_CTX_free(ctx); });
  wolfSSL_CTX_set_verify(ctx, WOLFSSL_VERIFY_NONE, nullptr);
  ASSERT_EQ(WOLFSSL_SUCCESS, wolfSSL_CTX_use_certificate_file(
                                 ctx, CLIENT_CERT_FILE, WOLFSSL_FILETYPE_PEM));
  ASSERT_EQ(WOLFSSL_SUCCESS,
            wolfSSL_CTX_use_PrivateKey_file(ctx, CLIENT_PRIVATE_KEY_FILE,
                                            WOLFSSL_FILETYPE_PEM));

  WOLFSSL_SESSION *session = nullptr;
  auto session_se = detail::scope_exit([&] {
    if (session) { wolfSSL_SESSION_free(session); }
  });

  // A request over a new connection, resuming `session` when there is one and
  // keeping the connection's own in its place. Tells whether it was answered.
  auto get = [&](int port) {
    auto error = Error::Success;
    auto sock = detail::create_client_socket(
        HOST, "", port, AF_UNSPEC, false, false, nullptr,
        /*connection_timeout_sec=*/5, 0,
        /*read_timeout_sec=*/5, 0,
        /*write_timeout_sec=*/5, 0, std::string(), error);
    if (sock == INVALID_SOCKET) { return false; }
    auto sock_se = detail::scope_exit([&] { detail::close_socket(sock); });

    auto ssl = wolfSSL_new(ctx);
    auto ssl_se = detail::scope_exit([&] { wolfSSL_free(ssl); });
    wolfSSL_set_fd(ssl, static_cast<int>(sock));
    if (session) { wolfSSL_set_session(ssl, session); }
    if (wolfSSL_connect(ssl) != WOLFSSL_SUCCESS) { return false; }

    std::string req = "GET /test HTTP/1.1\r\nHost: x\r\n"
                      "Connection: close\r\n\r\n";
    wolfSSL_write(ssl, req.data(), static_cast<int>(req.size()));
    std::string res;
    char buf[256];
    int n;
    while ((n = wolfSSL_read(ssl, buf, sizeof(buf))) > 0) {
      res.append(buf, static_cast<size_t>(n));
    }

    wolfSSL_shutdown(ssl);
    if (session) { wolfSSL_SESSION_free(session); }
    session = wolfSSL_get1_session(ssl);
    return res.find("200 OK") != std::string::npos;
  };

  ASSERT_TRUE(get(PORT));
  EXPECT_FALSE(get(PORT + 1));

  ASSERT_TRUE(get(PORT));
  ASSERT_TRUE(replace_client_ca(svr));
  EXPECT_FALSE(get(PORT));
}
#endif

TEST(SSLClientServerTest, UpdateCertsPemWaitsForHandshakeInProgress) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // A connection that sends no ClientHello keeps its handshake in progress,
  // once the server has had a moment to start it.
  auto error = Error::Success;
  auto sock = detail::create_client_socket(
      HOST, "", PORT, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/5, 0,
      /*read_timeout_sec=*/5, 0,
      /*write_timeout_sec=*/5, 0, std::string(), error);
  ASSERT_NE(INVALID_SOCKET, sock);
  std::this_thread::sleep_for(std::chrono::milliseconds(500));

  std::string cert_pem, key_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);

  auto update = std::async(std::launch::async, [&]() {
    return svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str());
  });
  EXPECT_EQ(std::future_status::timeout,
            update.wait_for(std::chrono::milliseconds(200)));

  detail::close_socket(sock);
  EXPECT_TRUE(update.get());

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}
#endif

TEST(ErrorHandlerTest, ContentLength) {
  Server svr;

  svr.set_error_handler([](const Request & /*req*/, Response &res) {
    res.status = StatusCode::OK_200;
    res.set_content("abcdefghijklmnopqrstuvwxyz",
                    "text/html"); // <= Content-Length still 13
  });

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!\n", "text/plain");
    res.status = 524;
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/hi", Headers{{"Accept-Encoding", ""}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
    EXPECT_EQ("26", res->get_header_value("Content-Length"));
    EXPECT_EQ("abcdefghijklmnopqrstuvwxyz", res->body);
  }
}

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
TEST(ExceptionTest, WithoutExceptionHandler) {
  Server svr;

  svr.Get("/exception", [&](const Request & /*req*/, Response & /*res*/) {
    throw std::runtime_error("exception...");
  });

  svr.Get("/unknown", [&](const Request & /*req*/, Response & /*res*/) {
    throw std::runtime_error("exception\r\n...");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  {
    auto res = cli.Get("/exception");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
    EXPECT_FALSE(res->has_header("EXCEPTION_WHAT"));
  }

  {
    auto res = cli.Get("/unknown");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
    EXPECT_FALSE(res->has_header("EXCEPTION_WHAT"));
  }
}

TEST(ExceptionTest, WithExceptionHandler) {
  Server svr;

  svr.set_exception_handler([](const Request & /*req*/, Response &res,
                               std::exception_ptr ep) {
    EXPECT_FALSE(ep == nullptr);
    try {
      std::rethrow_exception(ep);
    } catch (std::exception &e) {
      EXPECT_EQ("abc", std::string(e.what()));
    } catch (...) {}
    res.status = StatusCode::InternalServerError_500;
    res.set_content("abcdefghijklmnopqrstuvwxyz",
                    "text/html"); // <= Content-Length still 13 at this point
  });

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!\n", "text/plain");
    throw std::runtime_error("abc");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  for (size_t i = 0; i < 10; i++) {
    Client cli(HOST, PORT);

    for (size_t j = 0; j < 100; j++) {
      auto res = cli.Get("/hi", Headers{{"Accept-Encoding", ""}});
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
      EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
      EXPECT_EQ("26", res->get_header_value("Content-Length"));
      EXPECT_EQ("abcdefghijklmnopqrstuvwxyz", res->body);
    }

    cli.set_keep_alive(true);

    for (size_t j = 0; j < 100; j++) {
      auto res = cli.Get("/hi", Headers{{"Accept-Encoding", ""}});
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
      EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
      EXPECT_EQ("26", res->get_header_value("Content-Length"));
      EXPECT_EQ("abcdefghijklmnopqrstuvwxyz", res->body);
    }
  }
}

TEST(ExceptionTest, StatusIs500UnlessExceptionHandlerSetsIt) {
  Server svr;
  svr.set_exception_handler(
      [](const Request &, Response &res, std::exception_ptr) {
        res.set_content("oops", "text/plain");
      });
  svr.Get("/throw", [](const Request &, Response &) {
    throw std::runtime_error("throw");
  });
  svr.Get("/created-then-throw", [](const Request &, Response &res) {
    res.status = StatusCode::Created_201;
    throw std::runtime_error("created-then-throw");
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  for (auto path : {"/throw", "/created-then-throw"}) {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << path << ": " << to_string(res.error());
    EXPECT_EQ(StatusCode::InternalServerError_500, res->status) << path;
  }
}

TEST(ExceptionTest, AndErrorHandler) {
  Server svr;

  svr.set_error_handler([](const Request & /*req*/, Response &res) {
    if (res.body.empty()) { res.set_content("NOT_FOUND", "text/html"); }
  });

  svr.set_exception_handler(
      [](const Request & /*req*/, Response &res, std::exception_ptr ep) {
        EXPECT_FALSE(ep == nullptr);
        try {
          std::rethrow_exception(ep);
        } catch (std::exception &e) {
          res.set_content(e.what(), "text/html");
        } catch (...) {}
        res.status = StatusCode::InternalServerError_500;
      });

  svr.Get("/exception", [](const Request & /*req*/, Response & /*res*/) {
    throw std::runtime_error("EXCEPTION");
  });

  svr.Get("/error", [](const Request & /*req*/, Response &res) {
    res.set_content("ERROR", "text/html");
    res.status = StatusCode::InternalServerError_500;
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  {
    auto res = cli.Get("/exception");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
    EXPECT_EQ("EXCEPTION", res->body);
  }

  {
    auto res = cli.Get("/error");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
    EXPECT_EQ("ERROR", res->body);
  }

  {
    auto res = cli.Get("/invalid");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::NotFound_404, res->status);
    EXPECT_EQ("NOT_FOUND", res->body);
  }
}
#endif

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
// An exception from a user callback outside process_request()'s try/catch
// used to unwind into the task queue - which does not catch - and terminate
// the process. Each test below runs the server on a single worker thread: a
// guard that catches the exception but still loses the thread would otherwise
// be hidden by a spare worker serving the follow-up request. Note that a
// regression here aborts the whole test binary rather than failing one test.
TEST(ServerExceptionTest, ThrowingContentProviderDoesNotKillTheServer) {
  Server svr;
  svr.new_task_queue = [] { return new ThreadPool(1); };

  std::atomic<int> reported{0};
  svr.set_error_logger([&](const Error &err, const Request * /*req*/) {
    if (err == Error::UserCallbackException) { reported++; }
  });

  svr.Get("/throw", [](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        1024, "text/plain",
        [](size_t /*offset*/, size_t /*length*/, DataSink &sink) -> bool {
          sink.write("hello", 5);
          throw std::runtime_error("from the content provider");
        });
  });

  svr.Get("/ok", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);
    cli.set_read_timeout(5, 0);
    EXPECT_FALSE(cli.Get("/throw"));
  }

  EXPECT_TRUE(svr.is_running());
  EXPECT_EQ(1, reported.load());

  // A request on a fresh connection is still served.
  {
    Client cli(HOST, port);
    auto res = cli.Get("/ok");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("ok", res->body);
  }
}

TEST(ServerExceptionTest, ThrowingPostRoutingHandlerDoesNotKillTheServer) {
  Server svr;
  svr.new_task_queue = [] { return new ThreadPool(1); };

  std::atomic<bool> should_throw{true};

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("hi", "text/plain");
  });

  svr.set_post_routing_handler(
      [&](const Request & /*req*/, Response & /*res*/) {
        if (should_throw) {
          throw std::runtime_error("from the post-routing handler");
        }
      });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);
    cli.set_read_timeout(5, 0);
    EXPECT_FALSE(cli.Get("/hi"));
  }

  EXPECT_TRUE(svr.is_running());

  should_throw = false;

  {
    Client cli(HOST, port);
    auto res = cli.Get("/hi");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("hi", res->body);
  }
}

TEST(ServerExceptionTest, ThrowingErrorLoggerDoesNotReopenTheGuard) {
  // The guard reports the caught exception through the error logger, which is
  // a user callback too. A logger that throws has to be contained as well, or
  // the process would terminate from inside the catch.
  Server svr;
  svr.new_task_queue = [] { return new ThreadPool(1); };

  std::atomic<int> reported{0};
  svr.set_error_logger([&](const Error &err, const Request * /*req*/) {
    if (err == Error::UserCallbackException) {
      reported++;
      throw std::runtime_error("from the error logger");
    }
  });

  svr.Get("/throw", [](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        1024, "text/plain",
        [](size_t /*offset*/, size_t /*length*/, DataSink &sink) -> bool {
          sink.write("hello", 5);
          throw std::runtime_error("from the content provider");
        });
  });

  svr.Get("/ok", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);
    cli.set_read_timeout(5, 0);
    EXPECT_FALSE(cli.Get("/throw"));
  }

  EXPECT_TRUE(svr.is_running());
  EXPECT_EQ(1, reported.load());

  {
    Client cli(HOST, port);
    auto res = cli.Get("/ok");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("ok", res->body);
  }
}

TEST(ServerExceptionTest, ThrowingWebSocketHandlerDoesNotKillTheServer) {
  // A WebSocket handler runs on the upgrade path after the 101 has been sent,
  // so the exception unwinds through the ws::WebSocket object on its way to
  // the guard. None of the HTTP cases above cross that.
  Server svr;
  svr.new_task_queue = [] { return new ThreadPool(1); };

  std::atomic<int> reported{0};
  svr.set_error_logger([&](const Error &err, const Request * /*req*/) {
    if (err == Error::UserCallbackException) { reported++; }
  });

  svr.WebSocket("/ws", [](const Request & /*req*/, ws::WebSocket & /*ws*/) {
    throw std::runtime_error("from the WebSocket handler");
  });

  svr.Get("/ok", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    ws::WebSocketClient client("ws://localhost:" + std::to_string(port) +
                               "/ws");
    auto res = client.connect();
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());

    // The server dropped the connection instead of dying.
    std::string msg;
    EXPECT_FALSE(client.read(msg));
    client.close();
  }

  EXPECT_TRUE(svr.is_running());
  EXPECT_EQ(1, reported.load());

  {
    Client cli(HOST, port);
    auto res = cli.Get("/ok");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("ok", res->body);
  }
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(ServerExceptionTest, ThrowingContentProviderDoesNotKillTheSSLServer) {
  // SSLServer::process_and_close_socket() is a separate overload with its own
  // guard, so it is exercised on its own.
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.new_task_queue = [] { return new ThreadPool(1); };

  std::atomic<int> reported{0};
  svr.set_error_logger([&](const Error &err, const Request * /*req*/) {
    if (err == Error::UserCallbackException) { reported++; }
  });

  svr.Get("/throw", [](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        1024, "text/plain",
        [](size_t /*offset*/, size_t /*length*/, DataSink &sink) -> bool {
          sink.write("hello", 5);
          throw std::runtime_error("from the content provider");
        });
  });

  svr.Get("/ok", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    SSLClient cli(HOST, port);
    cli.enable_server_certificate_verification(false);
    cli.set_read_timeout(5, 0);
    EXPECT_FALSE(cli.Get("/throw"));
  }

  EXPECT_TRUE(svr.is_running());
  EXPECT_EQ(1, reported.load());

  {
    SSLClient cli(HOST, port);
    cli.enable_server_certificate_verification(false);
    auto res = cli.Get("/ok");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("ok", res->body);
  }
}
#endif
#endif

TEST(NoContentTest, ContentLength) {
  Server svr;

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.status = StatusCode::NoContent_204;
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/hi");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::NoContent_204, res->status);
    // RFC 9110 8.6: none in a 204 response
    EXPECT_FALSE(res->has_header("Content-Length"));
  }
}

TEST(ResponseFramingTest, HandlerFramingHeadersAreReplaced) {
  Server svr;

  svr.Get("/body", [](const Request & /*req*/, Response &res) {
    res.set_header("Content-Length", "5");
    res.set_content("hello world", "text/plain");
  });
  svr.Get("/chunked", [](const Request & /*req*/, Response &res) {
    // A body that reads as the last chunk, were it taken as chunked
    res.set_header("Transfer-Encoding", "chunked");
    res.set_content("0\r\n\r\n", "text/plain");
  });
  svr.Get("/provider", [](const Request & /*req*/, Response &res) {
    res.set_header("Content-Length", "2");
    res.set_content_provider(5, "text/plain",
                             [](size_t offset, size_t length, DataSink &sink) {
                               sink.write(&"hello"[offset], length);
                               return true;
                             });
  });
  svr.Get("/empty", [](const Request & /*req*/, Response &res) {
    res.set_header("Content-Length", "1234");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_read_timeout(1, 0);

  auto expect_body = [&](const Result &res, const std::string &body) {
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(body, res->body);
    EXPECT_EQ(1u, res->get_header_value_count("Content-Length"));
    EXPECT_FALSE(res->has_header("Transfer-Encoding"));
  };

  Headers identity{{"Accept-Encoding", ""}};
  expect_body(cli.Get("/body", identity), "hello world");
  expect_body(cli.Get("/chunked", identity), "0\r\n\r\n");
  expect_body(cli.Get("/body",
                      Headers{{"Accept-Encoding", ""}, {"Range", "bytes=0-1"}}),
              "he");
  expect_body(cli.Get("/provider", identity), "hello");
  expect_body(cli.Get("/empty", identity), "");

  // A HEAD response may give the length of the body a GET would get.
  auto res = cli.Head("/empty");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("1234", res->get_header_value("Content-Length"));
}

TEST(ResponseFramingTest, PostRoutingHandlerChangesAreFramed) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_content("short", "text/plain");
  });
  svr.set_post_routing_handler([](const Request & /*req*/, Response &res) {
    res.body += " with a footer";
    res.set_header("Transfer-Encoding", "chunked");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_read_timeout(1, 0);

  auto res = cli.Get("/", Headers{{"Accept-Encoding", ""}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("short with a footer", res->body);
  EXPECT_EQ("19", res->get_header_value("Content-Length"));
  EXPECT_FALSE(res->has_header("Transfer-Encoding"));
}

TEST(ResponseFramingTest, BodyWithoutLengthEndsWithTheConnection) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_header("Content-Length", "3");
    res.set_content_provider("text/plain", [](size_t, DataSink &sink) {
      sink.write("abc", 3);
      sink.done();
      return true;
    });
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_keep_alive(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("abc", res->body);
  EXPECT_FALSE(res->has_header("Content-Length"));
  EXPECT_EQ("close", res->get_header_value("Connection"));
  EXPECT_FALSE(res->has_header("Keep-Alive"));

  // No body to delimit
  auto head = cli.Head("/");
  ASSERT_TRUE(head) << "Error: " << to_string(head.error());
  EXPECT_FALSE(head->has_header("Connection"));
}

TEST(RoutingHandlerTest, PreAndPostRoutingHandlers) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
#else
  Server svr;
#endif

  svr.set_pre_routing_handler([](const Request &req, Response &res) {
    if (req.path == "/routing_handler") {
      res.set_header("PRE_ROUTING", "on");
      res.set_content("Routing Handler", "text/plain");
      return httplib::Server::HandlerResponse::Handled;
    }
    return httplib::Server::HandlerResponse::Unhandled;
  });

  svr.set_error_handler([](const Request & /*req*/, Response &res) {
    res.set_content("Error", "text/html");
  });

  svr.set_post_routing_handler([](const Request &req, Response &res) {
    if (req.path == "/routing_handler") {
      res.set_header("POST_ROUTING", "on");
    }
  });

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!\n", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    SSLClient cli(HOST, PORT);
    cli.enable_server_certificate_verification(false);
#else
    Client cli(HOST, PORT);
#endif

    auto res = cli.Get("/routing_handler");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Routing Handler", res->body);
    EXPECT_EQ(1U, res->get_header_value_count("PRE_ROUTING"));
    EXPECT_EQ("on", res->get_header_value("PRE_ROUTING"));
    EXPECT_EQ(1U, res->get_header_value_count("POST_ROUTING"));
    EXPECT_EQ("on", res->get_header_value("POST_ROUTING"));
  }

  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    SSLClient cli(HOST, PORT);
    cli.enable_server_certificate_verification(false);
#else
    Client cli(HOST, PORT);
#endif

    auto res = cli.Get("/hi");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Hello World!\n", res->body);
    EXPECT_EQ(0U, res->get_header_value_count("PRE_ROUTING"));
    EXPECT_EQ(0U, res->get_header_value_count("POST_ROUTING"));
  }

  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    SSLClient cli(HOST, PORT);
    cli.enable_server_certificate_verification(false);
#else
    Client cli(HOST, PORT);
#endif

    auto res = cli.Get("/aaa");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::NotFound_404, res->status);
    EXPECT_EQ("Error", res->body);
    EXPECT_EQ(0U, res->get_header_value_count("PRE_ROUTING"));
    EXPECT_EQ(0U, res->get_header_value_count("POST_ROUTING"));
  }
}

TEST(RequestHandlerTest, PreRequestHandler) {
  auto route_path = "/user/:user";

  Server svr;

  svr.Get("/hi", [](const Request &, Response &res) {
    res.set_content("hi", "text/plain");
  });

  svr.Get(route_path, [](const Request &req, Response &res) {
    res.set_content(req.path_params.at("user"), "text/plain");
  });

  svr.set_pre_request_handler([&](const Request &req, Response &res) {
    if (req.matched_route == route_path) {
      auto user = req.path_params.at("user");
      if (user != "john") {
        res.status = StatusCode::Forbidden_403;
        res.set_content("error", "text/html");
        return Server::HandlerResponse::Handled;
      }
    }
    return Server::HandlerResponse::Unhandled;
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  {
    auto res = cli.Get("/hi");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("hi", res->body);
  }

  {
    auto res = cli.Get("/user/john");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("john", res->body);
  }

  {
    auto res = cli.Get("/user/invalid-user");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Forbidden_403, res->status);
    EXPECT_EQ("error", res->body);
  }
}

// The pre-request handler must run before the request body is read, so a
// rejected request never forces the server to buffer a (potentially large)
// body. Here the posted body is larger than the payload limit: if the body
// were read first the server would answer 413, but because the pre-request
// handler runs first it answers 403 and the body is never read.
TEST(RequestHandlerTest, PreRequestHandlerRunsBeforeBodyIsRead) {
  Server svr;

  svr.set_payload_max_length(8);

  auto handler_ran = false;
  svr.Post("/reject", [&](const Request &req, Response &res) {
    handler_ran = true;
    res.set_content(req.body, "text/plain");
  });

  svr.Post("/accept", [](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  svr.set_pre_request_handler([](const Request &req, Response &res) {
    if (req.matched_route == "/reject") {
      res.status = StatusCode::Forbidden_403;
      res.set_content("denied", "text/plain");
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // Body (10 bytes) exceeds the 8-byte limit, yet the pre-request handler
  // rejects with 403 before the body is read, so 413 is never reached.
  {
    auto res = cli.Post("/reject", "0123456789", "text/plain");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Forbidden_403, res->status);
    EXPECT_EQ("denied", res->body);
    EXPECT_FALSE(handler_ran);
  }

  // An approved route still reads the body and enforces the payload limit.
  {
    auto res = cli.Post("/accept", "0123456789", "text/plain");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::PayloadTooLarge_413, res->status);
  }
}

TEST(UserDataTest, BasicOperations) {
  httplib::UserData ud;

  // Initially empty
  EXPECT_FALSE(ud.has("key"));
  EXPECT_EQ(nullptr, ud.get<int>("key"));

  // set and get
  ud.set("key", 42);
  EXPECT_TRUE(ud.has("key"));
  auto *p = ud.get<int>("key");
  ASSERT_NE(nullptr, p);
  EXPECT_EQ(42, *p);

  // Type mismatch → nullptr
  EXPECT_EQ(nullptr, ud.get<std::string>("key"));

  // Overwrite with different type
  ud.set("key", std::string("hello"));
  EXPECT_EQ(nullptr, ud.get<int>("key"));
  auto *s = ud.get<std::string>("key");
  ASSERT_NE(nullptr, s);
  EXPECT_EQ("hello", *s);

  // erase
  ud.erase("key");
  EXPECT_FALSE(ud.has("key"));

  // clear
  ud.set("a", 1);
  ud.set("b", 2);
  ud.clear();
  EXPECT_FALSE(ud.has("a"));
  EXPECT_FALSE(ud.has("b"));
}

TEST(RequestHandlerTest, ResponseUserDataInPreRouting) {
  struct AuthCtx {
    std::string user_id;
  };

  Server svr;

  svr.set_pre_routing_handler([](const Request & /*req*/, Response &res) {
    res.user_data.set("auth", AuthCtx{"alice"});
    return Server::HandlerResponse::Unhandled;
  });

  svr.Get("/me", [](const Request & /*req*/, Response &res) {
    auto *ctx = res.user_data.get<AuthCtx>("auth");
    ASSERT_NE(nullptr, ctx);
    res.set_content("Hello " + ctx->user_id, "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get("/me");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("Hello alice", res->body);
}

TEST(RequestHandlerTest, ResponseUserDataInPreRequest) {
  struct RoleCtx {
    std::string role;
  };

  Server svr;

  svr.set_pre_request_handler([](const Request & /*req*/, Response &res) {
    res.user_data.set("role", RoleCtx{"admin"});
    return Server::HandlerResponse::Unhandled;
  });

  svr.Get("/role", [](const Request & /*req*/, Response &res) {
    auto *ctx = res.user_data.get<RoleCtx>("role");
    ASSERT_NE(nullptr, ctx);
    res.set_content(ctx->role, "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get("/role");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("admin", res->body);
}

TEST(InvalidFormatTest, StatusCode) {
  Server svr;

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!\n", "text/plain");
    res.status = 9999; // Status should be a three-digit code...
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/hi");
    ASSERT_FALSE(res);
  }
}

TEST(URLFragmentTest, WithFragment) {
  Server svr;

  svr.Get("/hi", [](const Request &req, Response & /*res*/) {
    EXPECT_TRUE(req.target == "/hi");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/hi#key1=val1=key2=val2");
    EXPECT_TRUE(res);
    EXPECT_EQ(StatusCode::OK_200, res->status);

    res = cli.Get("/hi%23key1=val1=key2=val2");
    EXPECT_TRUE(res);
    EXPECT_EQ(StatusCode::NotFound_404, res->status);
  }
}

TEST(URLFragmentTest, ParamsGoBeforeTheFragment) {
  EXPECT_EQ("/a?b=1#f", append_query_params("/a#f", {{"b", "1"}}));
  EXPECT_EQ("/a?q=0&b=1#f", append_query_params("/a?q=0#f", {{"b", "1"}}));

  Server svr;
  std::vector<std::string> targets;
  svr.Get("/hi", [&](const Request &req, Response & /*res*/) {
    targets.push_back(req.target);
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  EXPECT_TRUE(cli.Get("/hi#f", Params{{"a", "1"}}, Headers{}));
  EXPECT_TRUE(cli.Get("/hi?q=0#f", Params{{"a", "1"}}, Headers{}));
  EXPECT_TRUE(cli.open_stream("GET", "/hi#f", {{"a", "1"}}).is_valid());

  // A '?' after the '#' belongs to the fragment, not to the query.
  Request req;
  req.method = "GET";
  req.path = "/hi#f?x=1";
  req.params.emplace("a", "1");
  Response res;
  auto error = Error::Success;
  EXPECT_TRUE(cli.send(req, res, error));

  EXPECT_EQ((std::vector<std::string>{"/hi?a=1", "/hi?q=0&a=1", "/hi?a=1",
                                      "/hi?a=1"}),
            targets);
}

TEST(HeaderWriter, SetHeaderWriter) {
  Server svr;

  svr.set_header_writer([](Stream &strm, Headers &hdrs) {
    hdrs.emplace("CustomServerHeader", "CustomServerValue");
    return detail::write_headers(strm, hdrs);
  });
  svr.Get("/hi", [](const Request &req, Response &res) {
    auto it = req.headers.find("CustomClientHeader");
    EXPECT_TRUE(it != req.headers.end());
    EXPECT_EQ(it->second, "CustomClientValue");
    res.set_content("Hello World!\n", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_header_writer([](Stream &strm, Headers &hdrs) {
      hdrs.emplace("CustomClientHeader", "CustomClientValue");
      return detail::write_headers(strm, hdrs);
    });

    auto res = cli.Get("/hi");
    EXPECT_TRUE(res);
    EXPECT_EQ(StatusCode::OK_200, res->status);

    auto it = res->headers.find("CustomServerHeader");
    EXPECT_TRUE(it != res->headers.end());
    EXPECT_EQ(it->second, "CustomServerValue");
  }
}

class ServerTest : public ::testing::Test {
protected:
  ServerTest()
      : cli_(HOST, PORT)
#ifdef CPPHTTPLIB_SSL_ENABLED
        ,
        svr_(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE)
#endif
  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli_.enable_server_certificate_verification(false);
#endif
    // Allow LARGE_DATA (100MB) responses
    cli_.set_payload_max_length(200 * 1024 * 1024);
  }

  virtual void SetUp() {
    // Allow LARGE_DATA (100MB) tests to pass with new 100MB default limit
    svr_.set_payload_max_length(200 * 1024 * 1024);

    svr_.set_mount_point("/", "./www");
    svr_.set_mount_point("/mount", "./www2");
    svr_.set_file_extension_and_mimetype_mapping("abcde", "text/abcde");

    svr_.Get("/hi",
             [&](const Request & /*req*/, Response &res) {
               res.set_content("Hello World!", "text/plain");
             })
        .Get("/file_content",
             [&](const Request & /*req*/, Response &res) {
               res.set_file_content("./www/dir/test.html");
             })
        .Get("/file_content_with_content_type",
             [&](const Request & /*req*/, Response &res) {
               res.set_file_content("./www/file", "text/plain");
             })
        .Get("/invalid_file_content",
             [&](const Request & /*req*/, Response &res) {
               res.set_file_content("./www/dir/invalid_file_path");
             })
        .Get("/http_response_splitting",
             [&](const Request & /*req*/, Response &res) {
               res.set_header("a", "1\r\nSet-Cookie: a=1");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("a"));

               res.set_header("a", "1\nSet-Cookie: a=1");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("a"));

               res.set_header("a", "1\rSet-Cookie: a=1");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("a"));

               res.set_header("a\r\nb", "0");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("a"));

               res.set_header("a\rb", "0");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("a"));

               res.set_header("a\nb", "0");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("a"));

               res.set_redirect("1\r\nSet-Cookie: a=1");
               EXPECT_EQ(0U, res.headers.size());
               EXPECT_FALSE(res.has_header("Location"));
             })
        .Get("/slow",
             [&](const Request & /*req*/, Response &res) {
               std::this_thread::sleep_for(std::chrono::seconds(4));
               res.set_content("slow", "text/plain");
             })
#if 0
        .Post("/slowpost",
              [&](const Request & /*req*/, Response &res) {
                std::this_thread::sleep_for(std::chrono::seconds(2));
                res.set_content("slow", "text/plain");
              })
#endif
        .Get("/remote_addr",
             [&](const Request &req, Response &res) {
               ASSERT_FALSE(req.has_header("REMOTE_ADDR"));
               ASSERT_FALSE(req.has_header("REMOTE_PORT"));
#ifndef CPPHTTPLIB_NO_EXCEPTIONS
               ASSERT_ANY_THROW(req.get_header_value("REMOTE_ADDR"));
               ASSERT_ANY_THROW(req.get_header_value("REMOTE_PORT"));
#endif
               res.set_content(req.remote_addr, "text/plain");
             })
        .Get("/local_addr",
             [&](const Request &req, Response &res) {
               ASSERT_FALSE(req.has_header("LOCAL_ADDR"));
               ASSERT_FALSE(req.has_header("LOCAL_PORT"));
#ifndef CPPHTTPLIB_NO_EXCEPTIONS
               ASSERT_ANY_THROW(req.get_header_value("LOCAL_ADDR"));
               ASSERT_ANY_THROW(req.get_header_value("LOCAL_PORT"));
#endif
               auto local_addr = req.local_addr;
               auto local_port = std::to_string(req.local_port);
               res.set_content(local_addr.append(":").append(local_port),
                               "text/plain");
             })
        .Get("/endwith%",
             [&](const Request & /*req*/, Response &res) {
               res.set_content("Hello World!", "text/plain");
             })
        .Get("/a\\+\\+b",
             [&](const Request &req, Response &res) {
               ASSERT_TRUE(req.has_param("a +b"));
               auto val = req.get_param_value("a +b");
               res.set_content(val, "text/plain");
             })
        .Get("/", [&](const Request & /*req*/,
                      Response &res) { res.set_redirect("/hi"); })
        .Post("/1",
              [](const Request & /*req*/, Response &res) {
                res.set_redirect("/2", StatusCode::SeeOther_303);
              })
        .Get("/2",
             [](const Request & /*req*/, Response &res) {
               res.set_content("redirected.", "text/plain");
               res.status = StatusCode::OK_200;
             })
        .Post("/person",
              [&](const Request &req, Response &res) {
                if (req.has_param("name") && req.has_param("note")) {
                  persons_[req.get_param_value("name")] =
                      req.get_param_value("note");
                } else {
                  res.status = StatusCode::BadRequest_400;
                }
              })
        .Put("/person",
             [&](const Request &req, Response &res) {
               if (req.has_param("name") && req.has_param("note")) {
                 persons_[req.get_param_value("name")] =
                     req.get_param_value("note");
               } else {
                 res.status = StatusCode::BadRequest_400;
               }
             })
        .Get("/person/(.*)",
             [&](const Request &req, Response &res) {
               string name = req.matches[1];
               if (persons_.find(name) != persons_.end()) {
                 auto note = persons_[name];
                 res.set_content(note, "text/plain");
               } else {
                 res.status = StatusCode::NotFound_404;
               }
             })
        .Delete("/person",
                [&](const Request &req, Response &res) {
                  if (req.has_param("name")) {
                    string name = req.get_param_value("name");
                    if (persons_.find(name) != persons_.end()) {
                      persons_.erase(name);
                      res.set_content("DELETED", "text/plain");
                    } else {
                      res.status = StatusCode::NotFound_404;
                    }
                  } else {
                    res.status = StatusCode::BadRequest_400;
                  }
                })
        .Post("/x-www-form-urlencoded-json",
              [&](const Request &req, Response &res) {
                auto json = req.get_param_value("json");
                ASSERT_EQ(JSON_DATA, json);
                res.set_content(json, "appliation/json");
                res.status = StatusCode::OK_200;
              })
        .Get("/streamed-chunked",
             [&](const Request & /*req*/, Response &res) {
               res.set_chunked_content_provider(
                   "text/plain", [](size_t /*offset*/, DataSink &sink) {
                     sink.os << "123";
                     sink.os << "456";
                     sink.os << "789";
                     sink.done();
                     return true;
                   });
             })
        .Get("/streamed-chunked-with-prohibited-trailer",
             [&](const Request & /*req*/, Response &res) {
               auto i = new int(0);
               // Declare both a prohibited trailer (Content-Length) and an
               // allowed one
               res.set_header("Trailer", "Content-Length, X-Allowed");

               res.set_chunked_content_provider(
                   "text/plain",
                   [i](size_t /*offset*/, DataSink &sink) {
                     switch (*i) {
                     case 0: sink.os << "123"; break;
                     case 1: sink.os << "456"; break;
                     case 2: sink.os << "789"; break;
                     case 3: {
                       sink.done_with_trailer(
                           {{"Content-Length", "5"}, {"X-Allowed", "yes"}});
                     } break;
                     }
                     (*i)++;
                     return true;
                   },
                   [i](bool success) {
                     EXPECT_TRUE(success);
                     delete i;
                   });
             })
        .Get("/streamed-chunked2",
             [&](const Request & /*req*/, Response &res) {
               auto i = new int(0);
               res.set_chunked_content_provider(
                   "text/plain",
                   [i](size_t /*offset*/, DataSink &sink) {
                     switch (*i) {
                     case 0: sink.os << "123"; break;
                     case 1: sink.os << "456"; break;
                     case 2: sink.os << "789"; break;
                     case 3: sink.done(); break;
                     }
                     (*i)++;
                     return true;
                   },
                   [i](bool success) {
                     EXPECT_TRUE(success);
                     delete i;
                   });
             })
        .Get("/streamed-chunked-with-trailer",
             [&](const Request & /*req*/, Response &res) {
               auto i = new int(0);
               res.set_header("Trailer", "Dummy1, Dummy2");
               res.set_chunked_content_provider(
                   "text/plain",
                   [i](size_t /*offset*/, DataSink &sink) {
                     switch (*i) {
                     case 0: sink.os << "123"; break;
                     case 1: sink.os << "456"; break;
                     case 2: sink.os << "789"; break;
                     case 3: {
                       sink.done_with_trailer(
                           {{"Dummy1", "DummyVal1"}, {"Dummy2", "DummyVal2"}});
                     } break;
                     }
                     (*i)++;
                     return true;
                   },
                   [i](bool success) {
                     EXPECT_TRUE(success);
                     delete i;
                   });
             })
        .Get("/streamed",
             [&](const Request & /*req*/, Response &res) {
               res.set_content_provider(
                   6, "text/plain",
                   [](size_t offset, size_t /*length*/, DataSink &sink) {
                     sink.os << (offset < 3 ? "a" : "b");
                     return true;
                   });
             })
        .Get("/streamed-without-length",
             [&](const Request & /*req*/, Response &res) {
               auto data = new std::string("abcdefg");
               res.set_content_provider(
                   "text/plain",
                   [data](size_t offset, DataSink &sink) {
                     if (offset < data->size()) {
                       sink.os << data->substr(offset);
                     }
                     sink.done();
                     return true;
                   },
                   [data](bool success) {
                     EXPECT_TRUE(success);
                     delete data;
                   });
             })
        .Get("/streamed-with-range",
             [&](const Request &req, Response &res) {
               auto data = new std::string("abcdefg");
               // An explicit status keeps the server from picking the 206 it
               // would otherwise choose for a ranged request, so the response
               // is not a partial representation.
               auto status = req.get_param_value("status");
               if (status == "200") {
                 res.status = StatusCode::OK_200;
               } else if (status == "403") {
                 res.status = StatusCode::Forbidden_403;
               }
               res.set_content_provider(
                   data->size(), "text/plain",
                   [data](size_t offset, size_t length, DataSink &sink) {
                     size_t DATA_CHUNK_SIZE = 4;
                     const auto &d = *data;
                     auto out_len =
                         std::min(static_cast<size_t>(length), DATA_CHUNK_SIZE);
                     auto ret =
                         sink.write(&d[static_cast<size_t>(offset)], out_len);
                     EXPECT_TRUE(ret);
                     return true;
                   },
                   [data, &req](bool success) {
                     EXPECT_EQ(success, !req.has_param("error"));
                     delete data;
                   });
             })
        .Get("/streamed-cancel",
             [&](const Request & /*req*/, Response &res) {
               res.set_content_provider(
                   size_t(-1), "text/plain",
                   [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
                     sink.os << "data_chunk";
                     return true;
                   });
             })
        .Get("/regex-with-delimiter",
             [&](const Request &req, Response & /*res*/) {
               ASSERT_TRUE(req.has_param("key"));
               EXPECT_EQ("^(?.*(value))", req.get_param_value("key"));
             })
        .Get("/with-range",
             [&](const Request & /*req*/, Response &res) {
               res.set_content("abcdefg", "text/plain");
             })
        .Get("/test-start-time",
             [&](const Request &req, Response & /*res*/) {
               EXPECT_NE(req.start_time_,
                         std::chrono::steady_clock::time_point::min());
             })
        .Get("/with-range-customized-response",
             [&](const Request & /*req*/, Response &res) {
               res.status = StatusCode::BadRequest_400;
               res.set_content(JSON_DATA, "application/json");
             })
        .Post("/chunked",
              [&](const Request &req, Response & /*res*/) {
                EXPECT_EQ(req.body, "dechunked post body");
              })
        .Post("/large-chunked",
              [&](const Request &req, Response & /*res*/) {
                std::string expected(6 * 30 * 1024u, 'a');
                EXPECT_EQ(req.body, expected);
              })
        .Post("/multipart",
              [&](const Request &req, Response & /*res*/) {
                EXPECT_EQ(4u, req.form.get_field_count("text1") +
                                  req.form.get_field_count("text2") +
                                  req.form.get_field_count("file3") +
                                  req.form.get_field_count("file4"));
                EXPECT_EQ(2u, req.form.get_file_count("file1") +
                                  req.form.get_file_count("file2"));
                ASSERT_TRUE(!req.form.has_file("???"));
                ASSERT_TRUE(!req.form.has_field("???"));
                ASSERT_TRUE(req.body.empty());

                {
                  const auto &text = req.form.get_field("text1");
                  EXPECT_EQ("text default", text);
                }

                {
                  const auto &text = req.form.get_field("text2");
                  EXPECT_EQ("aωb", text);
                }

                {
                  const auto &file = req.form.get_file("file1");
                  EXPECT_EQ("hello.txt", file.filename);
                  EXPECT_EQ("text/plain", file.content_type);
                  EXPECT_EQ("h\ne\n\nl\nl\no\n", file.content);
                }

                {
                  const auto &file = req.form.get_file("file2");
                  EXPECT_EQ("world.json", file.filename);
                  EXPECT_EQ("application/json", file.content_type);
                  EXPECT_EQ("{\n  \"world\", true\n}\n", file.content);
                }

                {
                  const auto &text = req.form.get_field("file3");
                  EXPECT_EQ(0u, text.size());
                }

                {
                  const auto &text = req.form.get_field("file4");
                  EXPECT_EQ(0u, text.size());
                }
              })
        .Post("/multipart/multi_file_values",
              [&](const Request &req, Response & /*res*/) {
                EXPECT_EQ(3u, req.form.get_field_count("text") +
                                  req.form.get_field_count("multi_text1"));
                EXPECT_EQ(2u, req.form.get_file_count("multi_file1"));
                ASSERT_TRUE(!req.form.has_file("???"));
                ASSERT_TRUE(!req.form.has_field("???"));
                ASSERT_TRUE(req.body.empty());

                {
                  const auto &text = req.form.get_field("text");
                  EXPECT_EQ("default text", text);
                }
                {
                  const auto &text1_values = req.form.get_fields("multi_text1");
                  EXPECT_EQ(2u, text1_values.size());
                  EXPECT_EQ("aaaaa", text1_values[0]);
                  EXPECT_EQ("bbbbb", text1_values[1]);
                }

                {
                  const auto &file1_values = req.form.get_files("multi_file1");
                  EXPECT_EQ(2u, file1_values.size());
                  auto file1 = file1_values[0];
                  EXPECT_EQ(file1.filename, "hello.txt");
                  EXPECT_EQ(file1.content_type, "text/plain");
                  EXPECT_EQ("h\ne\n\nl\nl\no\n", file1.content);

                  auto file2 = file1_values[1];
                  EXPECT_EQ(file2.filename, "world.json");
                  EXPECT_EQ(file2.content_type, "application/json");
                  EXPECT_EQ("{\n  \"world\", true\n}\n", file2.content);
                }
              })
        .Post("/empty",
              [&](const Request &req, Response &res) {
                EXPECT_EQ(req.body, "");
                EXPECT_EQ("text/plain", req.get_header_value("Content-Type"));
                EXPECT_EQ("0", req.get_header_value("Content-Length"));
                res.set_content("empty", "text/plain");
              })
        .Post("/empty-no-content-type",
              [&](const Request &req, Response &res) {
                EXPECT_EQ(req.body, "");
                EXPECT_FALSE(req.has_header("Content-Type"));
                EXPECT_EQ("0", req.get_header_value("Content-Length"));
                res.set_content("empty-no-content-type", "text/plain");
              })
        .Post("/path-only",
              [&](const Request &req, Response &res) {
                EXPECT_EQ(req.body, "");
                EXPECT_EQ("", req.get_header_value("Content-Type"));
                EXPECT_EQ("0", req.get_header_value("Content-Length"));
                res.set_content("path-only", "text/plain");
              })
        .Post("/path-headers-only",
              [&](const Request &req, Response &res) {
                EXPECT_EQ(req.body, "");
                EXPECT_EQ("", req.get_header_value("Content-Type"));
                EXPECT_EQ("0", req.get_header_value("Content-Length"));
                EXPECT_EQ("world", req.get_header_value("hello"));
                EXPECT_EQ("world2", req.get_header_value("hello2"));
                res.set_content("path-headers-only", "text/plain");
              })
        .Post("/post-large",
              [&](const Request &req, Response &res) {
                EXPECT_EQ(req.body, LARGE_DATA);
                res.set_content(req.body, "text/plain");
              })
        .Post("/post-loopback",
              [&](const Request &, Response &res,
                  ContentReader const &content_reader) {
                std::string body;
                content_reader([&](const char *data, size_t data_length) {
                  body.append(data, data_length);
                  return true;
                });

                res.set_content(body, "text/plain");
              })
        .Put("/put-loopback",
             [&](const Request &, Response &res,
                 ContentReader const &content_reader) {
               std::string body;
               content_reader([&](const char *data, size_t data_length) {
                 body.append(data, data_length);
                 return true;
               });

               res.set_content(body, "text/plain");
             })
        .Patch("/patch-loopback",
               [&](const Request &, Response &res,
                   ContentReader const &content_reader) {
                 std::string body;
                 content_reader([&](const char *data, size_t data_length) {
                   body.append(data, data_length);
                   return true;
                 });

                 res.set_content(body, "text/plain");
               })
        .Put("/empty-no-content-type",
             [&](const Request &req, Response &res) {
               EXPECT_EQ(req.body, "");
               EXPECT_FALSE(req.has_header("Content-Type"));
               EXPECT_EQ("0", req.get_header_value("Content-Length"));
               res.set_content("empty-no-content-type", "text/plain");
             })
        .Put("/put",
             [&](const Request &req, Response &res) {
               EXPECT_EQ(req.body, "PUT");
               res.set_content(req.body, "text/plain");
             })
        .Put("/put-large",
             [&](const Request &req, Response &res) {
               EXPECT_EQ(req.body, LARGE_DATA);
               res.set_content(req.body, "text/plain");
             })
        .Patch("/patch",
               [&](const Request &req, Response &res) {
                 EXPECT_EQ(req.body, "PATCH");
                 res.set_content(req.body, "text/plain");
               })
        .Delete("/delete",
                [&](const Request & /*req*/, Response &res) {
                  res.set_content("DELETE", "text/plain");
                })
        .Delete("/delete-body",
                [&](const Request &req, Response &res) {
                  EXPECT_EQ(req.body, "content");
                  res.set_content(req.body, "text/plain");
                })
        .Options(R"(\*)",
                 [&](const Request & /*req*/, Response &res) {
                   res.set_header("Allow", "GET, POST, HEAD, OPTIONS");
                 })
        .CustomRoute("PROPFIND", "/dav/:id",
                     [&](const Request &req, Response &res) {
                       res.set_header("x-body-size",
                                      std::to_string(req.body.size()));
                       res.set_header("x-matched-route", req.matched_route);
                       res.set_header("x-dav-id", req.path_params.at("id"));
                       res.status = StatusCode::MultiStatus_207;
                       res.set_content(req.body, "application/xml");
                     })
        .CustomRoute("PROPFIND", R"(/dav-re/(\d+))",
                     [&](const Request &req, Response &res) {
                       res.set_header("x-dav-match", req.matches[1]);
                       res.status = StatusCode::MultiStatus_207;
                     })
        .CustomRoute("MKCOL", "/dav-mkcol",
                     [&](const Request &req, Response &res) {
                       EXPECT_TRUE(req.body.empty());
                       res.status = StatusCode::Created_201;
                     })
        .CustomRoute(
            "REPORT", "/dav-report",
            [&](const Request & /*req*/, Response &res,
                const ContentReader &content_reader) {
              std::string body;
              content_reader([&](const char *data, size_t data_length) {
                body.append(data, data_length);
                return true;
              });
              res.set_header("x-body-size", std::to_string(body.size()));
              res.status = StatusCode::MultiStatus_207;
              res.set_content(body, "application/xml");
            })
        .Get("/request-target",
             [&](const Request &req, Response & /*res*/) {
               EXPECT_EQ("/request-target?aaa=bbb&ccc=ddd", req.target);
               EXPECT_EQ("bbb", req.get_param_value("aaa"));
               EXPECT_EQ("ddd", req.get_param_value("ccc"));
             })
        .Get("/long-query-value",
             [&](const Request &req, Response & /*res*/) {
               EXPECT_EQ(LONG_QUERY_URL, req.target);
               EXPECT_EQ(LONG_QUERY_VALUE, req.get_param_value("key"));
             })
        .Get("/too-long-query-value",
             [&](const Request &req, Response & /*res*/) {
               EXPECT_EQ(TOO_LONG_QUERY_URL, req.target);
               EXPECT_EQ(TOO_LONG_QUERY_VALUE, req.get_param_value("key"));
             })
        .Get("/array-param",
             [&](const Request &req, Response & /*res*/) {
               EXPECT_EQ(3u, req.get_param_value_count("array"));
               EXPECT_EQ("value1", req.get_param_value("array", 0));
               EXPECT_EQ("value2", req.get_param_value("array", 1));
               EXPECT_EQ("value3", req.get_param_value("array", 2));
             })
        .Get("/array-param-values",
             [&](const Request &req, Response & /*res*/) {
               auto values = req.get_param_values("array");
               EXPECT_EQ(3u, values.size());
               EXPECT_EQ("value1", values[0]);
               EXPECT_EQ("value2", values[1]);
               EXPECT_EQ("value3", values[2]);

               auto empty = req.get_param_values("nonexistent");
               EXPECT_TRUE(empty.empty());
             })
        .Post("/validate-no-multiple-headers",
              [&](const Request &req, Response & /*res*/) {
                EXPECT_EQ(1u, req.get_header_value_count("Content-Length"));
                EXPECT_EQ("5", req.get_header_value("Content-Length"));
              })
        .Post("/content_receiver",
              [&](const Request &req, Response &res,
                  const ContentReader &content_reader) {
                if (req.is_multipart_form_data()) {
                  std::vector<FormData> items;
                  content_reader(
                      [&](const FormData &file) {
                        items.push_back(file);
                        return true;
                      },
                      [&](const char *data, size_t data_length) {
                        items.back().content.append(data, data_length);
                        return true;
                      });

                  EXPECT_EQ(5u, items.size());

                  {
                    const auto &file = get_file_value(items, "text1");
                    EXPECT_TRUE(file.filename.empty());
                    EXPECT_EQ("text default", file.content);
                  }

                  {
                    const auto &file = get_file_value(items, "text2");
                    EXPECT_TRUE(file.filename.empty());
                    EXPECT_EQ("aωb", file.content);
                  }

                  {
                    const auto &file = get_file_value(items, "file1");
                    EXPECT_EQ("hello.txt", file.filename);
                    EXPECT_EQ("text/plain", file.content_type);
                    EXPECT_EQ("h\ne\n\nl\nl\no\n", file.content);
                  }

                  {
                    const auto &file = get_file_value(items, "file2");
                    EXPECT_EQ("world.json", file.filename);
                    EXPECT_EQ("application/json", file.content_type);
                    EXPECT_EQ(R"({\n  "world": true\n}\n)", file.content);
                  }

                  {
                    const auto &file = get_file_value(items, "file3");
                    EXPECT_TRUE(file.filename.empty());
                    EXPECT_EQ("application/octet-stream", file.content_type);
                    EXPECT_EQ(0u, file.content.size());
                  }
                } else {
                  std::string body;
                  content_reader([&](const char *data, size_t data_length) {
                    EXPECT_EQ(7U, data_length);
                    body.append(data, data_length);
                    return true;
                  });
                  EXPECT_EQ(body, "content");
                  res.set_content(body, "text/plain");
                }
              })
        .Put("/content_receiver",
             [&](const Request & /*req*/, Response &res,
                 const ContentReader &content_reader) {
               std::string body;
               content_reader([&](const char *data, size_t data_length) {
                 body.append(data, data_length);
                 return true;
               });
               EXPECT_EQ(body, "content");
               res.set_content(body, "text/plain");
             })
        .Patch("/content_receiver",
               [&](const Request & /*req*/, Response &res,
                   const ContentReader &content_reader) {
                 std::string body;
                 content_reader([&](const char *data, size_t data_length) {
                   body.append(data, data_length);
                   return true;
                 });
                 EXPECT_EQ(body, "content");
                 res.set_content(body, "text/plain");
               })
        .Post("/query-string-and-body",
              [&](const Request &req, Response & /*res*/) {
                ASSERT_TRUE(req.has_param("key"));
                EXPECT_EQ(req.get_param_value("key"), "value");
                EXPECT_EQ(req.body, "content");
              })
        .Get("/last-request",
             [&](const Request &req, Response & /*res*/) {
               EXPECT_EQ("close", req.get_header_value("Connection"));
             })
        .Get(R"(/redirect/(\d+))",
             [&](const Request &req, Response &res) {
               auto num = std::stoi(req.matches[1]) + 1;
               std::string url = "/redirect/" + std::to_string(num);
               res.set_redirect(url);
             })
        .Post("/binary",
              [&](const Request &req, Response &res) {
                EXPECT_EQ(4U, req.body.size());
                EXPECT_EQ("application/octet-stream",
                          req.get_header_value("Content-Type"));
                EXPECT_EQ("4", req.get_header_value("Content-Length"));
                res.set_content(req.body, "application/octet-stream");
              })
        .Put("/binary",
             [&](const Request &req, Response &res) {
               EXPECT_EQ(4U, req.body.size());
               EXPECT_EQ("application/octet-stream",
                         req.get_header_value("Content-Type"));
               EXPECT_EQ("4", req.get_header_value("Content-Length"));
               res.set_content(req.body, "application/octet-stream");
             })
        .Patch("/binary",
               [&](const Request &req, Response &res) {
                 EXPECT_EQ(4U, req.body.size());
                 EXPECT_EQ("application/octet-stream",
                           req.get_header_value("Content-Type"));
                 EXPECT_EQ("4", req.get_header_value("Content-Length"));
                 res.set_content(req.body, "application/octet-stream");
               })
        .Delete("/binary",
                [&](const Request &req, Response &res) {
                  EXPECT_EQ(4U, req.body.size());
                  EXPECT_EQ("application/octet-stream",
                            req.get_header_value("Content-Type"));
                  EXPECT_EQ("4", req.get_header_value("Content-Length"));
                  res.set_content(req.body, "application/octet-stream");
                })
        .Get("/issue1772",
             [&](const Request & /*req*/, Response &res) {
               res.status = 401;
               res.set_header("WWW-Authenticate", "Basic realm=123456");
             })
        .Delete("/issue609",
                [](const httplib::Request &, httplib::Response &res,
                   const httplib::ContentReader &) {
                  res.set_content("ok", "text/plain");
                })
#if defined(CPPHTTPLIB_ZLIB_SUPPORT) || defined(CPPHTTPLIB_BROTLI_SUPPORT) ||  \
    defined(CPPHTTPLIB_ZSTD_SUPPORT)
        .Get("/compress",
             [&](const Request & /*req*/, Response &res) {
               res.set_content(
                   "12345678901234567890123456789012345678901234567890123456789"
                   "01234567890123456789012345678901234567890",
                   "text/plain");
             })
        .Get("/compress-with-charset",
             [&](const Request & /*req*/, Response &res) {
               res.set_content(
                   "12345678901234567890123456789012345678901234567890123456789"
                   "01234567890123456789012345678901234567890",
                   "application/json; charset=utf-8");
             })
        .Get("/nocompress",
             [&](const Request & /*req*/, Response &res) {
               res.set_content(
                   "12345678901234567890123456789012345678901234567890123456789"
                   "01234567890123456789012345678901234567890",
                   "application/octet-stream");
             })
        .Post("/compress-multipart",
              [&](const Request &req, Response & /*res*/) {
                EXPECT_EQ(2u, req.form.fields.size());
                ASSERT_TRUE(!req.form.has_field("???"));

                {
                  const auto &text = req.form.get_field("key1");
                  EXPECT_EQ("test", text);
                }

                {
                  const auto &text = req.form.get_field("key2");
                  EXPECT_EQ("--abcdefg123", text);
                }
              })
#endif
        ;

    persons_["john"] = "programmer";

    t_ = thread([&]() { ASSERT_TRUE(svr_.listen(HOST, PORT)); });

    svr_.wait_until_ready();
  }

  virtual void TearDown() {
    svr_.stop();
    if (!request_threads_.empty()) {
      std::this_thread::sleep_for(std::chrono::seconds(1));
      for (auto &t : request_threads_) {
        t.join();
      }
    }
    t_.join();
  }

  map<string, string> persons_;
#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli_;
  SSLServer svr_;
#else
  Client cli_;
  Server svr_;
#endif
  thread t_;
  std::vector<thread> request_threads_;
};

TEST_F(ServerTest, GetMethod200) {
  auto res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("HTTP/1.1", res->version);
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("OK", res->reason);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ(1U, res->get_header_value_count("Content-Type"));
  EXPECT_EQ("Hello World!", res->body);
}

TEST_F(ServerTest, GetEmptyFile) {
  auto res = cli_.Get("/empty_file");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("application/octet-stream", res->get_header_value("Content-Type"));
  EXPECT_EQ(0, std::stoi(res->get_header_value("Content-Length")));
  EXPECT_EQ("", res->body);
}

TEST_F(ServerTest, GetFileContent) {
  auto res = cli_.Get("/file_content");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  EXPECT_EQ(9, std::stoi(res->get_header_value("Content-Length")));
  EXPECT_EQ("test.html", res->body);
}

TEST_F(ServerTest, GetFileContentWithRange) {
  auto res = cli_.Get("/file_content", Headers{{make_range_header({{1, 3}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  EXPECT_EQ("bytes 1-3/9", res->get_header_value("Content-Range"));
  EXPECT_EQ(3, std::stoi(res->get_header_value("Content-Length")));
  EXPECT_EQ("est", res->body);
}

TEST_F(ServerTest, GetFileContentWithContentType) {
  auto res = cli_.Get("/file_content_with_content_type");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ(5, std::stoi(res->get_header_value("Content-Length")));
  EXPECT_EQ("file\n", res->body);
}

TEST_F(ServerTest, GetInvalidFileContent) {
  auto res = cli_.Get("/invalid_file_content");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethod200withPercentEncoding) {
  auto res = cli_.Get("/%68%69"); // auto res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("HTTP/1.1", res->version);
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ(1U, res->get_header_value_count("Content-Type"));
  EXPECT_EQ("Hello World!", res->body);
}

TEST_F(ServerTest, GetMethod302) {
  auto res = cli_.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Found_302, res->status);
  EXPECT_EQ("/hi", res->get_header_value("Location"));
}

TEST_F(ServerTest, GetMethod302Redirect) {
  cli_.set_follow_location(true);
  auto res = cli_.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("Hello World!", res->body);
  EXPECT_EQ("/hi", res->location);
}

TEST_F(ServerTest, GetMethod404) {
  auto res = cli_.Get("/invalid");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, HeadMethod200) {
  auto res = cli_.Head("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_TRUE(res->body.empty());
}

TEST_F(ServerTest, HeadMethod200Static) {
  auto res = cli_.Head("/mount/dir/index.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  EXPECT_EQ(104, std::stoi(res->get_header_value("Content-Length")));
  EXPECT_TRUE(res->body.empty());
}

TEST_F(ServerTest, HeadMethod404) {
  auto res = cli_.Head("/invalid");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
  EXPECT_TRUE(res->body.empty());
}

TEST_F(ServerTest, GetMethodPersonJohn) {
  auto res = cli_.Get("/person/john");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("programmer", res->body);
}

TEST_F(ServerTest, PostMethod1) {
  auto res = cli_.Get("/person/john1");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);

  res = cli_.Post("/person", "name=john1&note=coder",
                  "application/x-www-form-urlencoded");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  res = cli_.Get("/person/john1");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("text/plain", res->get_header_value("Content-Type"));
  ASSERT_EQ("coder", res->body);
}

TEST_F(ServerTest, PostMethod2) {
  auto res = cli_.Get("/person/john2");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);

  Params params;
  params.emplace("name", "john2");
  params.emplace("note", "coder");

  res = cli_.Post("/person", params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  res = cli_.Get("/person/john2");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("text/plain", res->get_header_value("Content-Type"));
  ASSERT_EQ("coder", res->body);
}

TEST_F(ServerTest, PutMethod3) {
  auto res = cli_.Get("/person/john3");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);

  Params params;
  params.emplace("name", "john3");
  params.emplace("note", "coder");

  res = cli_.Put("/person", params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  res = cli_.Get("/person/john3");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("text/plain", res->get_header_value("Content-Type"));
  ASSERT_EQ("coder", res->body);
}

TEST_F(ServerTest, DeleteMethod1) {
  auto res = cli_.Get("/person/john4");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);

  Params params;
  params.emplace("name", "john4");
  params.emplace("note", "coder");

  res = cli_.Post("/person", params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  res = cli_.Get("/person/john4");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("text/plain", res->get_header_value("Content-Type"));
  ASSERT_EQ("coder", res->body);

  Params delete_params;
  delete_params.emplace("name", "john4");

  res = cli_.Delete("/person", delete_params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("DELETED", res->body);

  res = cli_.Get("/person/john4");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, DeleteMethod2) {
  auto res = cli_.Get("/person/john5");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);

  Params params;
  params.emplace("name", "john5");
  params.emplace("note", "developer");

  res = cli_.Post("/person", params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  res = cli_.Get("/person/john5");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("text/plain", res->get_header_value("Content-Type"));
  ASSERT_EQ("developer", res->body);

  Params delete_params;
  delete_params.emplace("name", "john5");

  Headers headers;
  headers.emplace("Custom-Header", "test-value");

  res = cli_.Delete("/person", headers, delete_params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("DELETED", res->body);

  res = cli_.Get("/person/john5");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, DeleteMethod3) {
  auto res = cli_.Get("/person/john6");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);

  Params params;
  params.emplace("name", "john6");
  params.emplace("note", "tester");

  res = cli_.Post("/person", params);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  res = cli_.Get("/person/john6");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("text/plain", res->get_header_value("Content-Type"));
  ASSERT_EQ("tester", res->body);

  Params delete_params;
  delete_params.emplace("name", "john6");

  Headers headers;
  headers.emplace("Custom-Header", "test-value");

  res = cli_.Delete("/person", headers, delete_params, nullptr);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("DELETED", res->body);

  res = cli_.Get("/person/john6");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, PostWwwFormUrlEncodedJson) {
  Params params;
  params.emplace("json", JSON_DATA);

  auto res = cli_.Post("/x-www-form-urlencoded-json", params);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(JSON_DATA, res->body);
}

TEST_F(ServerTest, PostEmptyContent) {
  auto res = cli_.Post("/empty", "", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("empty", res->body);
}

TEST_F(ServerTest, PostEmptyContentWithNoContentType) {
  auto res = cli_.Post("/empty-no-content-type");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("empty-no-content-type", res->body);
}

TEST_F(ServerTest, PostPathOnly) {
  auto res = cli_.Post("/path-only");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("path-only", res->body);
}

TEST_F(ServerTest, PostPathAndHeadersOnly) {
  auto res = cli_.Post("/path-headers-only",
                       Headers({{"hello", "world"}, {"hello2", "world2"}}));
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("path-headers-only", res->body);
}

TEST_F(ServerTest, PostLarge) {
  auto res = cli_.Post("/post-large", LARGE_DATA, "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(LARGE_DATA, res->body);
}

TEST_F(ServerTest, PutEmptyContentWithNoContentType) {
  auto res = cli_.Put("/empty-no-content-type");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("empty-no-content-type", res->body);
}

TEST_F(ServerTest, GetMethodDir) {
  auto res = cli_.Get("/dir/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));

  auto body = R"(<html>
<head>
</head>
<body>
  <a href="/dir/test.html">Test</a>
  <a href="/hi">hi</a>
</body>
</html>
)";
  EXPECT_EQ(body, res->body);
}

TEST_F(ServerTest, GetMethodDirTest) {
  auto res = cli_.Get("/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  EXPECT_EQ("test.html", res->body);
}

TEST_F(ServerTest, GetMethodDirTestWithDoubleDots) {
  auto res = cli_.Get("/dir/../dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodInvalidPath) {
  auto res = cli_.Get("/dir/../test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodOutOfBaseDir) {
  auto res = cli_.Get("/../www/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodOutOfBaseDir2) {
  auto res = cli_.Get("/dir/../../www/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodDirMountTest) {
  auto res = cli_.Get("/mount/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  EXPECT_EQ("test.html", res->body);
}

TEST_F(ServerTest, GetMethodDirMountTestWithDoubleDots) {
  auto res = cli_.Get("/mount/dir/../dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodInvalidMountPath) {
  auto res = cli_.Get("/mount/dir/../test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodEmbeddedNUL) {
  auto res = cli_.Get("/mount/dir/test.html%00.js");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodOutOfBaseDirMount) {
  auto res = cli_.Get("/mount/../www2/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodOutOfBaseDirMount2) {
  auto res = cli_.Get("/mount/dir/../../www2/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodOutOfBaseDirMountWithBackslash) {
  auto res = cli_.Get("/mount/%2e%2e%5c/www2/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, GetMethodDirMountWithoutTrailingSlash) {
  auto res = cli_.Get("/mount/dir");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);
  EXPECT_EQ("./dir/", res->get_header_value("Location"));
}

TEST_F(ServerTest, GetMethodDirWithLeadingDoubleSlash) {
  auto res = cli_.Get("//dir");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
  EXPECT_FALSE(res->has_header("Location"));
}

TEST_F(ServerTest, PostMethod303) {
  auto res = cli_.Post("/1", "body", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::SeeOther_303, res->status);
  EXPECT_EQ("/2", res->get_header_value("Location"));
}

TEST_F(ServerTest, PostMethod303Redirect) {
  cli_.set_follow_location(true);
  auto res = cli_.Post("/1", "body", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("redirected.", res->body);
  EXPECT_EQ("/2", res->location);
}

TEST_F(ServerTest, UserDefinedMIMETypeMapping) {
  auto res = cli_.Get("/dir/test.abcde");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/abcde", res->get_header_value("Content-Type"));
  EXPECT_EQ("abcde", res->body);
}

TEST_F(ServerTest, StaticFileRange) {
  auto res =
      cli_.Get("/dir/test.abcde", Headers{{make_range_header({{2, 3}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("text/abcde", res->get_header_value("Content-Type"));
  EXPECT_EQ("2", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 2-3/5", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("cd"), res->body);
}

TEST_F(ServerTest, StaticFileRanges) {
  auto res = cli_.Get("/dir/test.abcde",
                      Headers{{make_range_header({{1, 2}, {4, -1}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_TRUE(
      res->get_header_value("Content-Type")
          .find(
              "multipart/byteranges; boundary=--cpp-httplib-multipart-data-") ==
      0);
  EXPECT_EQ("266", res->get_header_value("Content-Length"));
}

TEST_F(ServerTest, StaticFileRangeHead) {
  auto res = cli_.Head("/dir/test.abcde", {{make_range_header({{2, 3}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("text/abcde", res->get_header_value("Content-Type"));
  EXPECT_EQ("2", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 2-3/5", res->get_header_value("Content-Range"));
}

TEST_F(ServerTest, StaticFileRangeBigFile) {
  auto res = cli_.Get("/dir/1MB.txt", Headers{{make_range_header({{-1, 5}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("5", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 1048571-1048575/1048576",
            res->get_header_value("Content-Range"));
  EXPECT_EQ("LAST\n", res->body);
}

TEST_F(ServerTest, StaticFileRangeBigFile2) {
  auto res =
      cli_.Get("/dir/1MB.txt", Headers{{make_range_header({{1, 4097}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("4097", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 1-4097/1048576", res->get_header_value("Content-Range"));
}

TEST_F(ServerTest, StaticFileBigFile) {
  auto res = cli_.Get("/dir/1MB.txt");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("1048576", res->get_header_value("Content-Length"));
}

TEST_F(ServerTest, InvalidBaseDirMount) {
  EXPECT_EQ(false, svr_.set_mount_point("invalid_mount_point", "./www3"));
}

TEST_F(ServerTest, Binary) {
  std::vector<char> binary{0x00, 0x01, 0x02, 0x03};

  auto res = cli_.Post("/binary", binary.data(), binary.size(),
                       "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());

  res = cli_.Put("/binary", binary.data(), binary.size(),
                 "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());

  res = cli_.Patch("/binary", binary.data(), binary.size(),
                   "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());

  res = cli_.Delete("/binary", binary.data(), binary.size(),
                    "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());
}

TEST_F(ServerTest, BinaryString) {
  auto binary = std::string("\x00\x01\x02\x03", 4);

  auto res = cli_.Post("/binary", binary, "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());

  res = cli_.Put("/binary", binary, "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());

  res = cli_.Patch("/binary", binary, "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());

  res = cli_.Delete("/binary", binary, "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(4U, res->body.size());
}

TEST_F(ServerTest, EmptyRequest) {
  auto res = cli_.Get("");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Connection, res.error());
}

TEST_F(ServerTest, LongRequest) {
  std::string request;
  for (size_t i = 0; i < 545; i++) {
    request += "/TooLongRequest";
  }
  request += "OK";

  auto res = cli_.Get(request.c_str());

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, TooLongRequest) {
  std::string request;
  for (size_t i = 0; i < 546; i++) {
    request += "/TooLongRequest";
  }
  request += "_NG";

  auto start = std::chrono::high_resolution_clock::now();

  cli_.set_keep_alive(true);
  auto res = cli_.Get(request.c_str());

  auto end = std::chrono::high_resolution_clock::now();
  auto elapsed =
      std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
          .count();

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::UriTooLong_414, res->status);
  EXPECT_LE(elapsed, 1000);
  EXPECT_EQ("close", res->get_header_value("Connection"));
  EXPECT_FALSE(cli_.is_socket_open());
}

TEST_F(ServerTest, AlmostTooLongRequest) {
  // test for #2046 - URI length check shouldn't include other content on req
  // line URI is max URI length, minus 14 other chars in req line (GET, space,
  // leading /, space, HTTP/1.1)
  std::string request =
      "/" + string(CPPHTTPLIB_REQUEST_URI_MAX_LENGTH - 14, 'A');

  auto res = cli_.Get(request.c_str());

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, LongHeader) {
  Request req;
  req.method = "GET";
  req.path = "/hi";

  std::string host_and_port;
  host_and_port += HOST;
  host_and_port += ":";
  host_and_port += std::to_string(PORT);

  req.headers.emplace("Host", host_and_port.c_str());
  req.headers.emplace("Accept", "*/*");
  req.headers.emplace("User-Agent", "cpp-httplib/0.1");

  req.headers.emplace(
      "Header-Name",
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@");

  auto res = std::make_shared<Response>();
  auto error = Error::Success;
  auto ret = cli_.send(req, *res, error);

  ASSERT_TRUE(ret);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, LongQueryValue) {
  auto start = std::chrono::high_resolution_clock::now();

  cli_.set_keep_alive(true);
  auto res = cli_.Get(LONG_QUERY_URL.c_str());

  auto end = std::chrono::high_resolution_clock::now();
  auto elapsed =
      std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
          .count();

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::UriTooLong_414, res->status);
  EXPECT_LE(elapsed, 1000);
  EXPECT_EQ("close", res->get_header_value("Connection"));
  EXPECT_FALSE(cli_.is_socket_open());
}

TEST_F(ServerTest, TooLongQueryValue) {
  auto res = cli_.Get(TOO_LONG_QUERY_URL.c_str());

  ASSERT_FALSE(res);
  EXPECT_EQ(Error::Read, res.error());
}

TEST_F(ServerTest, TooLongHeader) {
  Request req;
  req.method = "GET";
  req.path = "/hi";

  std::string host_and_port;
  host_and_port += HOST;
  host_and_port += ":";
  host_and_port += std::to_string(PORT);

  req.headers.emplace("Host", host_and_port.c_str());
  req.headers.emplace("Accept", "*/*");
  req.headers.emplace("User-Agent", "cpp-httplib/0.1");

  req.headers.emplace(
      "Header-Name",
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"
      "@@@@@@@@@@@@@@@@@");

  auto res = std::make_shared<Response>();
  auto error = Error::Success;
  auto ret = cli_.send(req, *res, error);

  ASSERT_TRUE(ret);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, HeaderCountAtLimit) {
  // Test with headers just under the 100 limit
  httplib::Headers headers;

  // Add 95 custom headers (the client will add Host, User-Agent, Accept, etc.)
  // This should keep us just under the 100 header limit
  for (int i = 0; i < 95; i++) {
    std::string name = "X-Test-Header-" + std::to_string(i);
    std::string value = "value" + std::to_string(i);
    headers.emplace(name, value);
  }

  // This should work fine as we're under the limit
  auto res = cli_.Get("/hi", headers);
  EXPECT_TRUE(res);
  if (res) { EXPECT_EQ(StatusCode::OK_200, res->status); }
}

TEST_F(ServerTest, HeaderCountExceedsLimit) {
  // Test with many headers to exceed the 100 limit
  httplib::Headers headers;

  // Add 150 headers to definitely exceed the 100 limit
  for (int i = 0; i < 150; i++) {
    std::string name = "X-Test-Header-" + std::to_string(i);
    std::string value = "value" + std::to_string(i);
    headers.emplace(name, value);
  }

  // This should fail due to exceeding header count limit
  cli_.set_keep_alive(true);
  auto res = cli_.Get("/hi", headers);

  // The server should respond with 400 Bad Request
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
  EXPECT_EQ("close", res->get_header_value("Connection"));
  EXPECT_FALSE(cli_.is_socket_open());
}

TEST_F(ServerTest, PercentEncoding) {
  auto res = cli_.Get("/e%6edwith%");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, PercentEncodingUnicode) {
  auto res = cli_.Get("/e%u006edwith%");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, InvalidPercentEncoding) {
  auto res = cli_.Get("/%endwith%");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, InvalidPercentEncodingUnicode) {
  auto res = cli_.Get("/%uendwith%");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, EndWithPercentCharacterInQuery) {
  auto res = cli_.Get("/hello?aaa=bbb%");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, PlusSignEncoding) {
  auto res = cli_.Get("/a+%2Bb?a %2bb=a %2Bb");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("a +b", res->body);
}

TEST_F(ServerTest, HeaderCountSecurityTest) {
  // This test simulates a potential DoS attack using many headers
  // to verify our security fix prevents memory exhaustion

  httplib::Headers attack_headers;

  // Attempt to add many headers like an attacker would (200 headers to far
  // exceed limit)
  for (int i = 0; i < 200; i++) {
    std::string name = "X-Attack-Header-" + std::to_string(i);
    std::string value = "attack_payload_" + std::to_string(i);
    attack_headers.emplace(name, value);
  }

  // Try to POST with excessive headers
  cli_.set_keep_alive(true);
  auto res = cli_.Post("/", attack_headers, "test_data", "text/plain");

  // Should either fail or return 400 Bad Request due to security limit
  if (res) {
    // If we get a response, it should be 400 Bad Request
    EXPECT_EQ(StatusCode::BadRequest_400, res->status);
    EXPECT_EQ("close", res->get_header_value("Connection"));
  }

  EXPECT_FALSE(cli_.is_socket_open());
}

TEST_F(ServerTest, MultipartFormData) {
  UploadFormDataItems items = {
      {"text1", "text default", "", ""},
      {"text2", "aωb", "", ""},
      {"file1", "h\ne\n\nl\nl\no\n", "hello.txt", "text/plain"},
      {"file2", "{\n  \"world\", true\n}\n", "world.json", "application/json"},
      {"file3", "", "", "application/octet-stream"},
      {"file4", "", "", "   application/json  tmp-string    "}};

  auto res = cli_.Post("/multipart", items);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, MultipartFormDataMultiFileValues) {
  UploadFormDataItems items = {
      {"text", "default text", "", ""},

      {"multi_text1", "aaaaa", "", ""},
      {"multi_text1", "bbbbb", "", ""},

      {"multi_file1", "h\ne\n\nl\nl\no\n", "hello.txt", "text/plain"},
      {"multi_file1", "{\n  \"world\", true\n}\n", "world.json",
       "application/json"},
  };

  auto res = cli_.Post("/multipart/multi_file_values", items);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, CaseInsensitiveHeaderName) {
  auto res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("content-type"));
  EXPECT_EQ("Hello World!", res->body);
}

TEST_F(ServerTest, CaseInsensitiveTransferEncoding) {
  Request req;
  req.method = "POST";
  req.path = "/chunked";

  std::string host_and_port;
  host_and_port += HOST;
  host_and_port += ":";
  host_and_port += std::to_string(PORT);

  req.headers.emplace("Host", host_and_port.c_str());
  req.headers.emplace("Accept", "*/*");
  req.headers.emplace("User-Agent", "cpp-httplib/0.1");
  req.headers.emplace("Content-Type", "text/plain");
  req.headers.emplace("Content-Length", "0");
  req.headers.emplace(
      "Transfer-Encoding",
      "Chunked"); // Note, "Chunked" rather than typical "chunked".

  // Client does not chunk, so make a chunked body manually.
  req.body = "4\r\ndech\r\nf\r\nunked post body\r\n0\r\n\r\n";

  auto res = std::make_shared<Response>();
  auto error = Error::Success;
  auto ret = cli_.send(req, *res, error);

  ASSERT_TRUE(ret);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

template <typename ClientT>
static void expect_chunked_body_status(ClientT &cli, const char *body,
                                       int expected_status) {
  Request req;
  req.method = "POST";
  req.path = "/chunked";

  std::string host_and_port;
  host_and_port += HOST;
  host_and_port += ":";
  host_and_port += std::to_string(PORT);

  req.headers.emplace("Host", host_and_port.c_str());
  req.headers.emplace("Content-Length", "0");
  req.headers.emplace("Transfer-Encoding", "chunked");
  req.body = body;

  auto res = std::make_shared<Response>();
  auto error = Error::Success;
  ASSERT_TRUE(cli.send(req, *res, error));
  EXPECT_EQ(expected_status, res->status);
}

// GHSA-h6wq-j5mv-f3q8: the server must reject malformed chunk-size lines
// rather than treat them as valid lengths.
template <typename ClientT>
static void expect_chunked_body_rejected(ClientT &cli, const char *body) {
  expect_chunked_body_status(cli, body, StatusCode::BadRequest_400);
}

TEST_F(ServerTest, RejectsNegativeChunkSize) {
  expect_chunked_body_rejected(cli_, "-2\r\nAAAA\r\n0\r\n\r\n");
}

TEST_F(ServerTest, RejectsChunkSizeWithLeadingPlus) {
  expect_chunked_body_rejected(
      cli_, "+4\r\ndech\r\nf\r\nunked post body\r\n0\r\n\r\n");
}

// RFC 9112 §7.1.1: a chunk-ext is made of tokens and quoted-strings, so the
// chunk-size line carries no CR, LF or other control character ahead of its
// terminator. Such a line must be refused rather than read as extension text.
TEST_F(ServerTest, RejectsBareLFInChunkExtension) {
  expect_chunked_body_rejected(
      cli_, "4;\nxx\r\ndech\r\nf\r\nunked post body\r\n0\r\n\r\n");
}

TEST_F(ServerTest, RejectsBareLFAfterChunkSize) {
  expect_chunked_body_rejected(
      cli_, "4\nxx\r\ndech\r\nf\r\nunked post body\r\n0\r\n\r\n");
}

TEST_F(ServerTest, RejectsBareCRInChunkExtension) {
  expect_chunked_body_rejected(
      cli_, "4;a\rb\r\ndech\r\nf\r\nunked post body\r\n0\r\n\r\n");
}

TEST_F(ServerTest, RejectsControlCharacterInChunkExtension) {
  // The literal stays split: a hex escape consumes every hex digit that
  // follows, so "\x01b" would be the single byte \x1b, not \x01 then 'b'.
  expect_chunked_body_rejected(
      cli_, "4;a\x01"
            "b\r\ndech\r\nf\r\nunked post body\r\n0\r\n\r\n");
}

// The bytes around chunk data are no payload, so they cannot ride on the
// payload limit
TEST_F(ServerTest, RejectsChunkOverheadPastItsLimit) {
  // Small enough that the whole request is sent before the server turns it
  // down, yet past the limit by the last chunks
  auto pad = std::string(CPPHTTPLIB_HEADER_MAX_LENGTH / 16, 'x');
  auto zeros = std::string(CPPHTTPLIB_HEADER_MAX_LENGTH / 16, '0');
  auto spaces = std::string(CPPHTTPLIB_HEADER_MAX_LENGTH / 16, ' ');
  for (const auto &size_line : {"1;" + pad, zeros + "1", "1" + spaces}) {
    SCOPED_TRACE(size_line.substr(0, 2));
    std::string body;
    for (auto c : std::string("dechunked post body")) {
      body += size_line + "\r\n" + c + "\r\n";
    }
    body += "0\r\n\r\n";
    expect_chunked_body_rejected(cli_, body.c_str());
  }
}

TEST_F(ServerTest, AcceptsChunkExtension) {
  expect_chunked_body_status(cli_,
                             "4;name=value\r\ndech\r\n"
                             "f ; note=\"a;b c\"\r\nunked post body\r\n"
                             "0;last\r\n\r\n",
                             StatusCode::OK_200);
}

TEST_F(ServerTest, GetStreamed2) {
  auto res = cli_.Get("/streamed", Headers{{make_range_header({{2, 3}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("2", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 2-3/6", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("ab"), res->body);
}

TEST_F(ServerTest, GetStreamed) {
  auto res = cli_.Get("/streamed");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("6", res->get_header_value("Content-Length"));
  EXPECT_EQ(std::string("aaabbb"), res->body);
}

TEST_F(ServerTest, GetStreamedWithoutLengthWithRange) {
  auto res = cli_.Get("/streamed-without-length",
                      Headers{make_range_header({{0, -1}})});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(false, res->has_header("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(std::string("abcdefg"), res->body);
}

TEST_F(ServerTest, GetStreamedWithRange1) {
  auto res =
      cli_.Get("/streamed-with-range", Headers{{make_range_header({{3, 5}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("3", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 3-5/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("def"), res->body);
}

TEST_F(ServerTest, GetStreamedWithRange2) {
  auto res =
      cli_.Get("/streamed-with-range", Headers{{make_range_header({{1, -1}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("6", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 1-6/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("bcdefg"), res->body);
}

TEST_F(ServerTest, GetStreamedWithRangeSuffix1) {
  auto res = cli_.Get("/streamed-with-range", Headers{{"Range", "bytes=-3"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("3", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 4-6/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("efg"), res->body);
}

TEST_F(ServerTest, GetStreamedWithRangeSuffix2) {
  // RFC 9110 14.1.2: a suffix-length longer than the representation selects
  // the entire representation.
  for (auto range : {"bytes=-8", "bytes=-9999"}) {
    auto res = cli_.Get("/streamed-with-range", Headers{{"Range", range}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::PartialContent_206, res->status) << range;
    EXPECT_EQ("7", res->get_header_value("Content-Length")) << range;
    EXPECT_EQ("bytes 0-6/7", res->get_header_value("Content-Range")) << range;
    EXPECT_EQ(std::string("abcdefg"), res->body) << range;
  }
}

TEST_F(ServerTest, GetStreamedWithRangeSuffixZero) {
  auto res =
      cli_.Get("/streamed-with-range?error", Headers{{"Range", "bytes=-0"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
  EXPECT_EQ("0", res->get_header_value("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(0U, res->body.size());
}

TEST_F(ServerTest, GetStreamedWithRangeAndNonPartialStatus) {
  // Only a 206 is served as a partial representation. Under any other status
  // `apply_ranges()` reported the full content length, so the body must match
  // that header, and the content provider must never be asked for an offset
  // outside the representation.
  auto check = [&](int status, const char *range) {
    auto path =
        std::string("/streamed-with-range?status=") + std::to_string(status);
    auto ctx = path + " Range: " + range;

    auto res = cli_.Get(path, Headers{{"Range", range}});
    ASSERT_TRUE(res) << ctx << " Error: " << to_string(res.error());
    EXPECT_EQ(status, res->status) << ctx;
    EXPECT_EQ("7", res->get_header_value("Content-Length")) << ctx;
    EXPECT_EQ("text/plain", res->get_header_value("Content-Type")) << ctx;
    EXPECT_FALSE(res->has_header("Content-Range")) << ctx;
    EXPECT_EQ(std::string("abcdefg"), res->body) << ctx;
  };

  // Non-2xx: `detail::range_error()` never validated these ranges at all.
  check(403, "bytes=3-5");
  // The offset is far past the representation.
  check(403, "bytes=100000-100200");
  // `first_pos` is still -1 here, and the bounds asserts in
  // `get_range_offset_and_length()` are compiled out under NDEBUG.
  check(403, "bytes=-3");
  // `apply_ranges()` makes no boundary for a non-206 response, so the
  // multipart branch would have written one that is empty.
  check(403, "bytes=1-2, 4-5");

  // 2xx but not 206: the ranges were validated, yet the Content-Length still
  // covers the whole representation.
  check(200, "bytes=3-5");
  check(200, "bytes=1-2, 4-5");
}

TEST_F(ServerTest, GetStreamedWithRangeError) {
  auto res =
      cli_.Get("/streamed-with-range",
               Headers{{"Range", "bytes=92233720368547758079223372036854775806-"
                                 "92233720368547758079223372036854775807"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
  EXPECT_EQ("0", res->get_header_value("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(0U, res->body.size());
}

TEST_F(ServerTest, GetRangeWithMaxLongLength) {
  auto res = cli_.Get(
      "/with-range",
      Headers{{"Range",
               "bytes=0-" + std::to_string(std::numeric_limits<long>::max())},
              {"Accept-Encoding", ""}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("7", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 0-6/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("abcdefg"), res->body);
}

TEST_F(ServerTest, GetRangeWithZeroToInfinite) {
  auto res = cli_.Get("/with-range", Headers{
                                         {"Range", "bytes=0-"},
                                         {"Accept-Encoding", ""},
                                     });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("7", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 0-6/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("abcdefg"), res->body);
}

TEST_F(ServerTest, GetStreamedWithRangeMultipart) {
  auto res = cli_.Get("/streamed-with-range",
                      Headers{{make_range_header({{1, 2}, {4, 5}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("267", res->get_header_value("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(267U, res->body.size());

  // Check that both range contents are present
  EXPECT_TRUE(res->body.find("bc\r\n") != std::string::npos);
  EXPECT_TRUE(res->body.find("ef\r\n") != std::string::npos);

  // Check that Content-Range headers are present for both ranges
  EXPECT_TRUE(res->body.find("Content-Range: bytes 1-2/7") !=
              std::string::npos);
  EXPECT_TRUE(res->body.find("Content-Range: bytes 4-5/7") !=
              std::string::npos);
}

TEST_F(ServerTest, GetStreamedWithTooManyRanges) {
  Ranges ranges;
  for (size_t i = 0; i < CPPHTTPLIB_RANGE_MAX_COUNT + 1; i++) {
    ranges.emplace_back(0, -1);
  }

  auto res = cli_.Get("/streamed-with-range?error",
                      Headers{{make_range_header(ranges)}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
  EXPECT_EQ("0", res->get_header_value("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(0U, res->body.size());
}

TEST_F(ServerTest, GetStreamedWithOverwrapping) {
  auto res = cli_.Get("/streamed-with-range",
                      Headers{{make_range_header({{1, 4}, {2, 5}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ(5U, res->body.size());

  // Check that overlapping ranges are coalesced into a single range
  EXPECT_EQ("bcdef", res->body);
  EXPECT_EQ("bytes 1-5/7", res->get_header_value("Content-Range"));

  // Should be single range, not multipart
  EXPECT_TRUE(res->has_header("Content-Range"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
}

TEST_F(ServerTest, GetStreamedWithNonAscendingRanges) {
  auto res = cli_.Get("/streamed-with-range",
                      Headers{{make_range_header({{4, 5}, {0, 2}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ(268U, res->body.size());

  // Check that both range contents are present
  EXPECT_TRUE(res->body.find("ef\r\n") != std::string::npos);
  EXPECT_TRUE(res->body.find("abc\r\n") != std::string::npos);

  // Check that Content-Range headers are present for both ranges
  EXPECT_TRUE(res->body.find("Content-Range: bytes 4-5/7") !=
              std::string::npos);
  EXPECT_TRUE(res->body.find("Content-Range: bytes 0-2/7") !=
              std::string::npos);
}

TEST_F(ServerTest, GetStreamedWithDuplicateRanges) {
  auto res = cli_.Get("/streamed-with-range",
                      Headers{{make_range_header({{0, 2}, {0, 2}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ(269U, res->body.size());

  // Check that both duplicate range contents are present
  size_t first_abc = res->body.find("abc\r\n");
  EXPECT_TRUE(first_abc != std::string::npos);
  size_t second_abc = res->body.find("abc\r\n", first_abc + 1);
  EXPECT_TRUE(second_abc != std::string::npos);

  // Check that Content-Range headers are present for both ranges
  size_t first_range = res->body.find("Content-Range: bytes 0-2/7");
  EXPECT_TRUE(first_range != std::string::npos);
  size_t second_range =
      res->body.find("Content-Range: bytes 0-2/7", first_range + 1);
  EXPECT_TRUE(second_range != std::string::npos);
}

TEST_F(ServerTest, GetStreamedWithRangesMoreThanTwoOverwrapping) {
  auto res =
      cli_.Get("/streamed-with-range?error",
               Headers{{make_range_header({{0, 1}, {1, 2}, {2, 3}, {3, 4}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
  EXPECT_EQ("0", res->get_header_value("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(0U, res->body.size());
}

TEST_F(ServerTest, GetStreamedEndless) {
  uint64_t offset = 0;
  auto res = cli_.Get("/streamed-cancel",
                      [&](const char * /*data*/, uint64_t data_length) {
                        if (offset < 100) {
                          offset += data_length;
                          return true;
                        }
                        return false;
                      });
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST_F(ServerTest, ClientStop) {
  std::atomic_size_t count{4};
  std::vector<std::thread> threads;

  for (auto i = count.load(); i != 0; --i) {
    threads.emplace_back([&]() {
      auto res = cli_.Get("/streamed-cancel",
                          [&](const char *, uint64_t) { return true; });

      --count;

      ASSERT_TRUE(!res);
      EXPECT_TRUE(res.error() == Error::Canceled ||
                  res.error() == Error::Read || res.error() == Error::Write);
    });
  }

  std::this_thread::sleep_for(std::chrono::seconds(2));
  while (count != 0) {
    cli_.stop();
    std::this_thread::sleep_for(std::chrono::milliseconds(10));
  }
  for (auto &t : threads) {
    t.join();
  }
}

TEST_F(ServerTest, GetWithRange1) {
  auto res = cli_.Get("/with-range", Headers{
                                         make_range_header({{3, 5}}),
                                         {"Accept-Encoding", ""},
                                     });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("3", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 3-5/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("def"), res->body);
}

TEST_F(ServerTest, GetWithRange2) {
  auto res = cli_.Get("/with-range", Headers{
                                         make_range_header({{1, -1}}),
                                         {"Accept-Encoding", ""},
                                     });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("6", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 1-6/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("bcdefg"), res->body);
}

TEST_F(ServerTest, GetWithRange3) {
  auto res = cli_.Get("/with-range", Headers{
                                         make_range_header({{0, 0}}),
                                         {"Accept-Encoding", ""},
                                     });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("1", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 0-0/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("a"), res->body);
}

TEST_F(ServerTest, GetWithRange4) {
  auto res = cli_.Get("/with-range", Headers{
                                         make_range_header({{-1, 2}}),
                                         {"Accept-Encoding", ""},
                                     });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("2", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 5-6/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("fg"), res->body);
}

TEST_F(ServerTest, GetWithRange5) {
  auto res = cli_.Get("/with-range", Headers{
                                         make_range_header({{0, 5}}),
                                         {"Accept-Encoding", ""},
                                     });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("6", res->get_header_value("Content-Length"));
  EXPECT_EQ(true, res->has_header("Content-Range"));
  EXPECT_EQ("bytes 0-5/7", res->get_header_value("Content-Range"));
  EXPECT_EQ(std::string("abcdef"), res->body);
}

TEST_F(ServerTest, GetWithRangeOffsetGreaterThanContent) {
  auto res =
      cli_.Get("/with-range", Headers{{make_range_header({{10000, 20000}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
}

TEST_F(ServerTest, GetWithRangeMultipart) {
  auto res =
      cli_.Get("/with-range", Headers{{make_range_header({{1, 2}, {4, 5}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_EQ("267", res->get_header_value("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(267U, res->body.size());
}

TEST_F(ServerTest, GetWithRangeMultipartOffsetGreaterThanContent) {
  auto res = cli_.Get("/with-range",
                      Headers{{make_range_header({{-1, 2}, {10000, 30000}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
}

TEST_F(ServerTest, GetWithRangeCustomizedResponse) {
  auto res = cli_.Get("/with-range-customized-response",
                      Headers{{make_range_header({{1, 2}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
  EXPECT_EQ(true, res->has_header("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(JSON_DATA, res->body);
}

TEST_F(ServerTest, GetWithRangeMultipartCustomizedResponseMultipleRange) {
  auto res = cli_.Get("/with-range-customized-response",
                      Headers{{make_range_header({{1, 2}, {4, 5}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
  EXPECT_EQ(true, res->has_header("Content-Length"));
  EXPECT_EQ(false, res->has_header("Content-Range"));
  EXPECT_EQ(JSON_DATA, res->body);
}

TEST_F(ServerTest, Issue1772) {
  auto res = cli_.Get("/issue1772", Headers{{make_range_header({{1000, -1}})}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
}

TEST_F(ServerTest, Issue609) {
  auto res = cli_.Delete("/issue609");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("ok"), res->body);
}

TEST_F(ServerTest, GetStreamedChunked) {
  auto res = cli_.Get("/streamed-chunked");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);
}

TEST_F(ServerTest, GetStreamedChunked2) {
  auto res = cli_.Get("/streamed-chunked2");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);
}

TEST_F(ServerTest, GetStreamedChunkedWithTrailer) {
  auto res = cli_.Get("/streamed-chunked-with-trailer");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);

  EXPECT_TRUE(res->has_header("Trailer"));
  EXPECT_EQ(1U, res->get_header_value_count("Trailer"));
  EXPECT_EQ(std::string("Dummy1, Dummy2"), res->get_header_value("Trailer"));

  // Trailers are now stored separately from headers (security fix)
  EXPECT_EQ(2U, res->trailers.size());
  EXPECT_TRUE(res->has_trailer("Dummy1"));
  EXPECT_TRUE(res->has_trailer("Dummy2"));
  EXPECT_FALSE(res->has_trailer("Dummy3"));
  EXPECT_EQ(std::string("DummyVal1"), res->get_trailer_value("Dummy1"));
  EXPECT_EQ(std::string("DummyVal2"), res->get_trailer_value("Dummy2"));

  // Verify trailers are NOT in headers (security verification)
  EXPECT_EQ(std::string(""), res->get_header_value("Dummy1"));
  EXPECT_EQ(std::string(""), res->get_header_value("Dummy2"));
}

TEST_F(ServerTest, LargeChunkedPost) {
  Request req;
  req.method = "POST";
  req.path = "/large-chunked";

  std::string host_and_port;
  host_and_port += HOST;
  host_and_port += ":";
  host_and_port += std::to_string(PORT);

  req.headers.emplace("Host", host_and_port.c_str());
  req.headers.emplace("Accept", "*/*");
  req.headers.emplace("User-Agent", "cpp-httplib/0.1");
  req.headers.emplace("Content-Type", "text/plain");
  req.headers.emplace("Content-Length", "0");
  req.headers.emplace("Transfer-Encoding", "chunked");

  std::string long_string(30 * 1024u, 'a');
  std::string chunk = "7800\r\n" + long_string + "\r\n";

  // Attempt to make a large enough post to exceed OS buffers, to test that
  // the server handles short reads if the full chunk data isn't available.
  req.body = chunk + chunk + chunk + chunk + chunk + chunk + "0\r\n\r\n";

  auto res = std::make_shared<Response>();
  auto error = Error::Success;
  auto ret = cli_.send(req, *res, error);

  ASSERT_TRUE(ret);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, GetMethodRemoteAddr) {
  auto res = cli_.Get("/remote_addr");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_TRUE(res->body == "::1" || res->body == "127.0.0.1");
}

TEST_F(ServerTest, GetMethodLocalAddr) {
  auto res = cli_.Get("/local_addr");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_TRUE(res->body == std::string("::1:").append(to_string(PORT)) ||
              res->body == std::string("127.0.0.1:").append(to_string(PORT)));
}

TEST_F(ServerTest, HTTPResponseSplitting) {
  auto res = cli_.Get("/http_response_splitting");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, SlowRequest) {
  request_threads_.emplace_back([this]() { auto res = cli_.Get("/slow"); });
  request_threads_.emplace_back([this]() { auto res = cli_.Get("/slow"); });
  request_threads_.emplace_back([this]() { auto res = cli_.Get("/slow"); });
}

#if 0
TEST_F(ServerTest, SlowPost) {
  char buffer[64 * 1024];
  memset(buffer, 0x42, sizeof(buffer));

  auto res = cli_.Post(
      "/slowpost", 64 * 1024 * 1024,
      [&](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        auto ret = sink.write(buffer, sizeof(buffer));
        EXPECT_TRUE(ret);
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, SlowPostFail) {
  char buffer[64 * 1024];
  memset(buffer, 0x42, sizeof(buffer));

  cli_.set_write_timeout(std::chrono::seconds(0));
  auto res = cli_.Post(
      "/slowpost", 64 * 1024 * 1024,
      [&](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.write(buffer, sizeof(buffer));
        return true;
      },
      "text/plain");

  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Write, res.error());
}
#endif

TEST_F(ServerTest, Put) {
  auto res = cli_.Put("/put", "PUT", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PutWithContentProvider) {
  auto res = cli_.Put(
      "/put", 3,
      [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.os << "PUT";
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PostWithContentProviderAbort) {
  auto res = cli_.Post(
      "/post", 42,
      [](size_t /*offset*/, size_t /*length*/, DataSink & /*sink*/) {
        return false;
      },
      "text/plain");

  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST_F(ServerTest, PutWithContentProviderWithoutLength) {
  auto res = cli_.Put(
      "/put",
      [](size_t /*offset*/, DataSink &sink) {
        sink.os << "PUT";
        sink.done();
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PostWithContentProviderWithoutLengthAbort) {
  auto res = cli_.Post(
      "/post", [](size_t /*offset*/, DataSink & /*sink*/) { return false; },
      "text/plain");

  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST_F(ServerTest, PostLoopBack) {
  std::string body;
  auto res = cli_.Post(
      "/post-loopback", 9,
      [](size_t /*offset*/, size_t length, DataSink &sink) {
        EXPECT_EQ(9u, length);
        sink.write("123", 3);
        sink.write("456", 3);
        sink.write("789", 3);
        return true;
      },
      "text/plain",
      [&body](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("123456789", body);
}

TEST_F(ServerTest, PutLoopBack) {
  std::string body;
  auto res = cli_.Put(
      "/put-loopback", 9,
      [](size_t /*offset*/, size_t length, DataSink &sink) {
        EXPECT_EQ(9u, length);
        sink.write("123", 3);
        sink.write("456", 3);
        sink.write("789", 3);
        return true;
      },
      "text/plain",
      [&body](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("123456789", body);
}

TEST_F(ServerTest, PatchLoopBack) {
  std::string body;
  auto res = cli_.Patch(
      "/patch-loopback", 9,
      [](size_t /*offset*/, size_t length, DataSink &sink) {
        EXPECT_EQ(9u, length);
        sink.write("123", 3);
        sink.write("456", 3);
        sink.write("789", 3);
        return true;
      },
      "text/plain",
      [&body](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("123456789", body);
}

TEST_F(ServerTest, PostLoopBackWithoutRequestContentLength) {
  std::string body;
  auto res = cli_.Post(
      "/post-loopback",
      [](size_t /*offset*/, DataSink &sink) {
        sink.write("123", 3);
        sink.write("456", 3);
        sink.write("789", 3);
        sink.done();
        return true;
      },
      "text/plain",
      [&body](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("123456789", body);
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST_F(ServerTest, PutWithContentProviderWithGzip) {
  cli_.set_compress(true);
  auto res = cli_.Put(
      "/put", 3,
      [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.os << "PUT";
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PostWithContentProviderWithGzipAbort) {
  cli_.set_compress(true);
  auto res = cli_.Post(
      "/post", 42,
      [](size_t /*offset*/, size_t /*length*/, DataSink & /*sink*/) {
        return false;
      },
      "text/plain");

  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST_F(ServerTest, PutWithContentProviderWithoutLengthWithGzip) {
  cli_.set_compress(true);
  auto res = cli_.Put(
      "/put",
      [](size_t /*offset*/, DataSink &sink) {
        sink.os << "PUT";
        sink.done();
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PostWithContentProviderWithoutLengthWithGzipAbort) {
  cli_.set_compress(true);
  auto res = cli_.Post(
      "/post", [](size_t /*offset*/, DataSink & /*sink*/) { return false; },
      "text/plain");

  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::Canceled, res.error());
}

TEST_F(ServerTest, PutLargeFileWithGzip) {
  cli_.set_compress(true);
  auto res = cli_.Put("/put-large", LARGE_DATA, "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(LARGE_DATA, res->body);
}

TEST_F(ServerTest, PutLargeFileWithGzip2) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  std::string s = std::string("https://") + HOST + ":" + std::to_string(PORT);
  Client cli(s.c_str());
  cli.enable_server_certificate_verification(false);
#else
  std::string s = std::string("http://") + HOST + ":" + std::to_string(PORT);
  Client cli(s.c_str());
#endif
  cli.set_compress(true);

  auto res = cli.Put("/put-large", LARGE_DATA, "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(LARGE_DATA, res->body);
  // The compressed size should be less than a 10th of the original. May vary
  // depending on the zlib library.
  EXPECT_LT(res.get_request_header_value_u64("Content-Length"),
            static_cast<uint64_t>(10 * 1024 * 1024));
#ifdef CPPHTTPLIB_BROTLI_SUPPORT
  EXPECT_EQ("br", res.get_request_header_value("Content-Encoding"));
#elif defined(CPPHTTPLIB_ZLIB_SUPPORT)
  EXPECT_EQ("gzip", res.get_request_header_value("Content-Encoding"));
#elif defined(CPPHTTPLIB_ZSTD_SUPPORT)
  EXPECT_EQ("zstd", res.get_request_header_value("Content-Encoding"));
#endif
}

TEST_F(ServerTest, PutContentWithDeflate) {
  cli_.set_compress(false);
  Headers headers;
  headers.emplace("Content-Encoding", "deflate");
  // PUT in deflate format:
  auto res = cli_.Put("/put", headers,
                      "\170\234\013\010\015\001\0\001\361\0\372", "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, GetStreamedChunkedWithGzip) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");

  auto res = cli_.Get("/streamed-chunked", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);
}

TEST_F(ServerTest, GetStreamedChunkedWithGzip2) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");

  auto res = cli_.Get("/streamed-chunked2", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);
}

TEST_F(ServerTest, SplitDelimiterInPathRegex) {
  auto res = cli_.Get("/regex-with-delimiter?key=^(?.*(value))");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(GzipDecompressor, ChunkedDecompression) {
  std::string data;
  for (size_t i = 0; i < 32 * 1024; ++i) {
    data.push_back(static_cast<char>('a' + i % 26));
  }

  std::string compressed_data;
  {
    httplib::detail::gzip_compressor compressor;
    bool result = compressor.compress(
        data.data(), data.size(),
        /*last=*/true,
        [&](const char *compressed_data_chunk, size_t compressed_data_size) {
          compressed_data.insert(compressed_data.size(), compressed_data_chunk,
                                 compressed_data_size);
          return true;
        });
    ASSERT_TRUE(result);
  }

  std::string decompressed_data;
  {
    httplib::detail::gzip_decompressor decompressor;

    // Chunk size is chosen specifically to have a decompressed chunk size equal
    // to 16384 bytes 16384 bytes is the size of decompressor output buffer
    size_t chunk_size = 130;
    for (size_t chunk_begin = 0; chunk_begin < compressed_data.size();
         chunk_begin += chunk_size) {
      size_t current_chunk_size =
          std::min(compressed_data.size() - chunk_begin, chunk_size);
      bool result = decompressor.decompress(
          compressed_data.data() + chunk_begin, current_chunk_size,
          [&](const char *decompressed_data_chunk,
              size_t decompressed_data_chunk_size) {
            decompressed_data.insert(decompressed_data.size(),
                                     decompressed_data_chunk,
                                     decompressed_data_chunk_size);
            return true;
          });
      ASSERT_TRUE(result);
    }
  }
  ASSERT_EQ(data, decompressed_data);
}

TEST(GzipDecompressor, DeflateDecompression) {
  std::string original_text = "Raw deflate without gzip";
  unsigned char data[32] = {0x78, 0x9C, 0x0B, 0x4A, 0x2C, 0x57, 0x48, 0x49,
                            0x4D, 0xCB, 0x49, 0x2C, 0x49, 0x55, 0x28, 0xCF,
                            0x2C, 0xC9, 0xC8, 0x2F, 0x2D, 0x51, 0x48, 0xAF,
                            0xCA, 0x2C, 0x00, 0x00, 0x6F, 0x98, 0x09, 0x2E};
  std::string compressed_data(data, data + sizeof(data) / sizeof(data[0]));

  std::string decompressed_data;
  {
    httplib::detail::gzip_decompressor decompressor;

    bool result = decompressor.decompress(
        compressed_data.data(), compressed_data.size(),
        [&](const char *decompressed_data_chunk,
            size_t decompressed_data_chunk_size) {
          decompressed_data.insert(decompressed_data.size(),
                                   decompressed_data_chunk,
                                   decompressed_data_chunk_size);
          return true;
        });
    ASSERT_TRUE(result);
  }
  ASSERT_EQ(original_text, decompressed_data);
}

TEST(GzipDecompressor, DeflateDecompressionTrailingBytes) {
  std::string original_text = "Raw deflate without gzip";
  unsigned char data[40] = {0x78, 0x9C, 0x0B, 0x4A, 0x2C, 0x57, 0x48, 0x49,
                            0x4D, 0xCB, 0x49, 0x2C, 0x49, 0x55, 0x28, 0xCF,
                            0x2C, 0xC9, 0xC8, 0x2F, 0x2D, 0x51, 0x48, 0xAF,
                            0xCA, 0x2C, 0x00, 0x00, 0x6F, 0x98, 0x09, 0x2E,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  std::string compressed_data(data, data + sizeof(data) / sizeof(data[0]));

  std::string decompressed_data;
  {
    httplib::detail::gzip_decompressor decompressor;

    bool result = decompressor.decompress(
        compressed_data.data(), compressed_data.size(),
        [&](const char *decompressed_data_chunk,
            size_t decompressed_data_chunk_size) {
          decompressed_data.insert(decompressed_data.size(),
                                   decompressed_data_chunk,
                                   decompressed_data_chunk_size);
          return true;
        });
    ASSERT_TRUE(result);
  }
  ASSERT_EQ(original_text, decompressed_data);
}

#endif

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
TEST_F(ServerTest, GetStreamedChunkedWithBrotli) {
  Headers headers;
  headers.emplace("Accept-Encoding", "br");

  auto res = cli_.Get("/streamed-chunked", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);
}

TEST_F(ServerTest, GetStreamedChunkedWithBrotli2) {
  Headers headers;
  headers.emplace("Accept-Encoding", "br");

  auto res = cli_.Get("/streamed-chunked2", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(std::string("123456789"), res->body);
}

TEST_F(ServerTest, PutWithContentProviderWithBrotli) {
  cli_.set_compress(true);
  auto res = cli_.Put(
      "/put", 3,
      [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.os << "PUT";
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PutWithContentProviderWithoutLengthWithBrotli) {
  cli_.set_compress(true);
  auto res = cli_.Put(
      "/put",
      [](size_t /*offset*/, DataSink &sink) {
        sink.os << "PUT";
        sink.done();
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

TEST_F(ServerTest, PutLargeFileWithBrotli) {
  cli_.set_compress(true);
  auto res = cli_.Put("/put-large", LARGE_DATA, "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(LARGE_DATA, res->body);
  EXPECT_EQ("br", res.get_request_header_value("Content-Encoding"));
}
#endif

TEST_F(ServerTest, Patch) {
  auto res = cli_.Patch("/patch", "PATCH", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PATCH", res->body);
}

TEST_F(ServerTest, Delete) {
  auto res = cli_.Delete("/delete");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("DELETE", res->body);
}

TEST_F(ServerTest, DeleteContentReceiver) {
  auto res = cli_.Delete("/delete-body", "content", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("content", res->body);
}

TEST_F(ServerTest, Options) {
  auto res = cli_.Options("*");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("GET, POST, HEAD, OPTIONS", res->get_header_value("Allow"));
  EXPECT_TRUE(res->body.empty());
}

TEST_F(ServerTest, URL) {
  auto res = cli_.Get("/request-target?aaa=bbb&ccc=ddd");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, ArrayParam) {
  auto res = cli_.Get("/array-param?array=value1&array=value2&array=value3");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, ArrayParamValues) {
  auto res =
      cli_.Get("/array-param-values?array=value1&array=value2&array=value3");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, NoMultipleHeaders) {
  Headers headers = {{"Content-Length", "5"}};
  auto res = cli_.Post("/validate-no-multiple-headers", headers, "hello",
                       "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, PostContentReceiver) {
  auto res = cli_.Post("/content_receiver", "content", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("content", res->body);
}

TEST_F(ServerTest, PostMultipartFileContentReceiver) {
  UploadFormDataItems items = {
      {"text1", "text default", "", ""},
      {"text2", "aωb", "", ""},
      {"file1", "h\ne\n\nl\nl\no\n", "hello.txt", "text/plain"},
      {"file2", R"({\n  "world": true\n}\n)", "world.json", "application/json"},
      {"file3", "", "", "application/octet-stream"},
  };

  auto res = cli_.Post("/content_receiver", items);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, PostMultipartPlusBoundary) {
  UploadFormDataItems items = {
      {"text1", "text default", "", ""},
      {"text2", "aωb", "", ""},
      {"file1", "h\ne\n\nl\nl\no\n", "hello.txt", "text/plain"},
      {"file2", R"({\n  "world": true\n}\n)", "world.json", "application/json"},
      {"file3", "", "", "application/octet-stream"},
  };

  auto boundary = std::string("+++++");

  std::string body;

  for (const auto &item : items) {
    body += "--" + boundary + "\r\n";
    body += "Content-Disposition: form-data; name=\"" + item.name + "\"";
    if (!item.filename.empty()) {
      body += "; filename=\"" + item.filename + "\"";
    }
    body += "\r\n";
    if (!item.content_type.empty()) {
      body += "Content-Type: " + item.content_type + "\r\n";
    }
    body += "\r\n";
    body += item.content + "\r\n";
  }
  body += "--" + boundary + "--\r\n";

  std::string content_type = "multipart/form-data; boundary=" + boundary;
  auto res = cli_.Post("/content_receiver", body, content_type.c_str());

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MultipartFormDataTest, FieldEscaping) {
  Server svr;

  svr.Post("/post", [&](const Request &req, Response & /*res*/,
                        const ContentReader &content_reader) {
    ASSERT_TRUE(req.is_multipart_form_data());
    std::vector<FormData> received;
    content_reader(
        [&](const FormData &file) {
          received.push_back(file);
          return true;
        },
        [&](const char *data, size_t data_length) {
          received.back().content.append(data, data_length);
          return true;
        });

    // '"', CR and LF in names and filenames are escaped following the
    // WHATWG HTML standard, so each part still parses as a single part
    // with no injected headers. Content types get CR/LF escaped too,
    // while '"' (legal there, e.g. quoted charset) is preserved.
    ASSERT_EQ(4U, received.size());

    EXPECT_EQ("na%22me", received[0].name);
    EXPECT_EQ("quoted name", received[0].content);

    EXPECT_EQ("file", received[1].name);
    EXPECT_EQ("evil%0D%0AContent-Type: text/evil%0D%0A%0D%0A.pdf",
              received[1].filename);
    EXPECT_EQ("application/octet-stream", received[1].content_type);
    EXPECT_EQ("injected", received[1].content);

    EXPECT_EQ("my%0Dna%0Ame", received[2].name);
    EXPECT_EQ("my%22file.txt", received[2].filename);
    EXPECT_EQ("cr lf name", received[2].content);

    EXPECT_EQ("typed", received[3].name);
    EXPECT_EQ("text/plain; charset=\"utf-8\"%0D%0AX-Evil: 1",
              received[3].content_type);
    EXPECT_EQ("typed content", received[3].content);
  });

  auto port = svr.bind_to_any_port("localhost");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", port);

  UploadFormDataItems items = {
      {"na\"me", "quoted name", "", ""},
      {"file", "injected", "evil\r\nContent-Type: text/evil\r\n\r\n.pdf",
       "application/octet-stream"},
      {"my\rna\nme", "cr lf name", "my\"file.txt", "text/plain"},
      {"typed", "typed content", "",
       "text/plain; charset=\"utf-8\"\r\nX-Evil: 1"},
  };

  auto res = cli.Post("/post", items);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MultipartFormDataTest, PublicWriterAPI) {
  const UploadFormDataItems items = {
      {"name1", "Content 1", "", ""},
      {"name2", "Content 2", "file2.txt", "text/plain"},
  };

  Server svr;

  svr.Post("/post", [&](const Request &req, Response & /*res*/,
                        const ContentReader &content_reader) {
    ASSERT_TRUE(req.is_multipart_form_data());
    std::vector<FormData> received;
    content_reader(
        [&](const FormData &file) {
          received.push_back(file);
          return true;
        },
        [&](const char *data, size_t data_length) {
          received.back().content.append(data, data_length);
          return true;
        });

    ASSERT_EQ(2U, received.size());
    EXPECT_EQ("name1", received[0].name);
    EXPECT_EQ("Content 1", received[0].content);
    EXPECT_EQ("name2", received[1].name);
    EXPECT_EQ("Content 2", received[1].content);
    EXPECT_EQ("file2.txt", received[1].filename);
    EXPECT_EQ("text/plain", received[1].content_type);
  });

  auto port = svr.bind_to_any_port("localhost");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", port);

  // Whole-body serialization with a generated boundary
  {
    MultipartFormDataWriter writer;
    EXPECT_TRUE(is_valid_multipart_boundary(writer.boundary()));
    EXPECT_EQ("multipart/form-data; boundary=" + writer.boundary(),
              writer.content_type());

    auto body = writer.serialize(items);
    EXPECT_EQ(body.size(), writer.content_length(items));

    auto res = cli.Post("/post", body, writer.content_type());
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  // Per-part framing with a custom boundary via a content provider
  {
    EXPECT_FALSE(is_valid_multipart_boundary("bad boundary"));
    ASSERT_TRUE(is_valid_multipart_boundary("custom-boundary_123"));

    MultipartFormDataWriter writer("custom-boundary_123");
    EXPECT_EQ("custom-boundary_123", writer.boundary());

    std::string body;
    for (const auto &item : items) {
      body += writer.item_begin(item);
      body += item.content;
      body += MultipartFormDataWriter::item_end();
    }
    body += writer.finish();
    EXPECT_EQ(body.size(), writer.content_length(items));

    auto res = cli.Post(
        "/post", body.size(),
        [&](size_t offset, size_t length, DataSink &sink) {
          sink.write(body.data() + offset, length);
          return true;
        },
        writer.content_type());
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST_F(ServerTest, PostContentReceiverGzip) {
  cli_.set_compress(true);
  auto res = cli_.Post("/content_receiver", "content", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("content", res->body);
}

TEST_F(ServerTest, PutContentReceiver) {
  auto res = cli_.Put("/content_receiver", "content", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("content", res->body);
}

TEST_F(ServerTest, PatchContentReceiver) {
  auto res = cli_.Patch("/content_receiver", "content", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ("content", res->body);
}

template <typename ClientType>
void TestWithHeadersAndContentReceiver(
    ClientType &cli,
    std::function<Result(ClientType &, const std::string &, const Headers &,
                         const std::string &, const std::string &,
                         ContentReceiver, DownloadProgress)>
        request_func) {
  Headers headers;
  headers.emplace("X-Custom-Header", "test-value");

  std::string received_body;
  auto res = request_func(
      cli, "/content_receiver", headers, "content", "application/json",
      [&](const char *data, size_t data_length) {
        received_body.append(data, data_length);
        return true;
      },
      nullptr);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("content", received_body);
}

TEST_F(ServerTest, PostWithHeadersAndContentReceiver) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiver<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver, DownloadProgress progress) {
        return cli.Post(path, headers, body, content_type, receiver, progress);
      });
}

TEST_F(ServerTest, PutWithHeadersAndContentReceiver) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiver<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver, DownloadProgress progress) {
        return cli.Put(path, headers, body, content_type, receiver, progress);
      });
}

TEST_F(ServerTest, PatchWithHeadersAndContentReceiver) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiver<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver, DownloadProgress progress) {
        return cli.Patch(path, headers, body, content_type, receiver, progress);
      });
}

template <typename ClientType>
void TestWithHeadersAndContentReceiverWithProgress(
    ClientType &cli,
    std::function<Result(ClientType &, const std::string &, const Headers &,
                         const std::string &, const std::string &,
                         ContentReceiver, DownloadProgress)>
        request_func) {
  Headers headers;
  headers.emplace("X-Test-Header", "progress-test");

  std::string received_body;
  auto progress_called = false;

  auto res = request_func(
      cli, "/content_receiver", headers, "content", "text/plain",
      [&](const char *data, size_t data_length) {
        received_body.append(data, data_length);
        return true;
      },
      [&](uint64_t /*current*/, uint64_t /*total*/) {
        progress_called = true;
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("content", received_body);
  EXPECT_TRUE(progress_called);
}

TEST_F(ServerTest, PostWithHeadersAndContentReceiverWithProgress) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiverWithProgress<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver, DownloadProgress progress) {
        return cli.Post(path, headers, body, content_type, receiver, progress);
      });
}

TEST_F(ServerTest, PutWithHeadersAndContentReceiverWithProgress) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiverWithProgress<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver, DownloadProgress progress) {
        return cli.Put(path, headers, body, content_type, receiver, progress);
      });
}

TEST_F(ServerTest, PatchWithHeadersAndContentReceiverWithProgress) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiverWithProgress<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver, DownloadProgress progress) {
        return cli.Patch(path, headers, body, content_type, receiver, progress);
      });
}

template <typename ClientType>
void TestWithHeadersAndContentReceiverError(
    ClientType &cli, std::function<Result(ClientType &, const std::string &,
                                          const Headers &, const std::string &,
                                          const std::string &, ContentReceiver)>
                         request_func) {
  Headers headers;
  headers.emplace("X-Error-Test", "true");

  std::string received_body;
  auto receiver_failed = false;

  auto res =
      request_func(cli, "/content_receiver", headers, "content", "text/plain",
                   [&](const char *data, size_t data_length) {
                     received_body.append(data, data_length);
                     receiver_failed = true;
                     return false;
                   });

  ASSERT_FALSE(res);
  EXPECT_TRUE(receiver_failed);
}

TEST_F(ServerTest, PostWithHeadersAndContentReceiverError) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiverError<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver) {
        return cli.Post(path, headers, body, content_type, receiver);
      });
}

TEST_F(ServerTest, PuttWithHeadersAndContentReceiverError) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiverError<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver) {
        return cli.Put(path, headers, body, content_type, receiver);
      });
}

TEST_F(ServerTest, PatchWithHeadersAndContentReceiverError) {
#ifdef CPPHTTPLIB_SSL_ENABLED
  using ClientT = SSLClient;
#else
  using ClientT = Client;
#endif
  TestWithHeadersAndContentReceiverError<ClientT>(
      cli_, [](ClientT &cli, const std::string &path, const Headers &headers,
               const std::string &body, const std::string &content_type,
               ContentReceiver receiver) {
        return cli.Patch(path, headers, body, content_type, receiver);
      });
}

TEST_F(ServerTest, PostQueryStringAndBody) {
  auto res =
      cli_.Post("/query-string-and-body?key=value", "content", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, HTTP2Magic) {
  Request req;
  req.method = "PRI";
  req.path = "*";
  req.body = "SM";

  auto res = std::make_shared<Response>();
  auto error = Error::Success;
  auto ret = cli_.send(req, *res, error);

  ASSERT_TRUE(ret);
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
}

TEST_F(ServerTest, KeepAlive) {
  auto res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("Hello World!", res->body);

  res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("Hello World!", res->body);

  res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("Hello World!", res->body);

  res = cli_.Get("/not-exist");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);

  res = cli_.Post("/empty", "", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("empty", res->body);
  EXPECT_EQ("close", res->get_header_value("Connection"));

  res = cli_.Post(
      "/empty", 0, [&](size_t, size_t, DataSink &) { return true; },
      "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("empty", res->body);

  cli_.set_keep_alive(false);
  res = cli_.Get("/last-request");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("close", res->get_header_value("Connection"));
}

TEST_F(ServerTest, TooManyRedirect) {
  cli_.set_follow_location(true);
  auto res = cli_.Get("/redirect/0");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::ExceedRedirectCount, res.error());
}

TEST_F(ServerTest, BadRequestLineCancelsKeepAlive) {
  Request req;
  req.method = "FOOBAR";
  req.path = "/hi";

  cli_.set_keep_alive(true);
  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
  EXPECT_EQ("close", res->get_header_value("Connection"));
  EXPECT_FALSE(cli_.is_socket_open());
}

TEST_F(ServerTest, CustomRouteReadsBody) {
  const std::string xml =
      R"(<?xml version="1.0"?><propfind><allprop/></propfind>)";

  Request req;
  req.method = "PROPFIND";
  req.path = "/dav/dir";
  req.set_header("Depth", "1");
  req.body = xml;

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
  EXPECT_EQ(xml, res->body);
  EXPECT_EQ(std::to_string(xml.size()), res->get_header_value("x-body-size"));
  EXPECT_EQ("application/xml", res->get_header_value("Content-Type"));
}

TEST_F(ServerTest, CustomRouteMatchedRouteAndPathParams) {
  Request req;
  req.method = "PROPFIND";
  req.path = "/dav/42";

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
  EXPECT_EQ("/dav/:id", res->get_header_value("x-matched-route"));
  EXPECT_EQ("42", res->get_header_value("x-dav-id"));
}

TEST_F(ServerTest, CustomRouteRegexPattern) {
  Request req;
  req.method = "PROPFIND";
  req.path = "/dav-re/123";

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
  EXPECT_EQ("123", res->get_header_value("x-dav-match"));
}

TEST_F(ServerTest, CustomRouteWithoutBody) {
  Request req;
  req.method = "MKCOL";
  req.path = "/dav-mkcol";

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Created_201, res->status);
}

TEST_F(ServerTest, CustomRouteWithContentReader) {
  const std::string xml = R"(<?xml version="1.0"?><sync-collection/>)";

  Request req;
  req.method = "REPORT";
  req.path = "/dav-report";
  req.body = xml;

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
  EXPECT_EQ(xml, res->body);
}

// A content reader route must fire even when the request carries no body,
// the way the built-in Delete(pattern, HandlerWithContentReader) does.
// Without that, a body-less PROPFIND-style request would fall through to 404.
TEST_F(ServerTest, CustomRouteWithContentReaderWithoutBody) {
  Request req;
  req.method = "REPORT";
  req.path = "/dav-report";

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
  EXPECT_EQ("0", res->get_header_value("x-body-size"));
}

TEST_F(ServerTest, CustomRouteUnmatchedPathReturns404) {
  Request req;
  req.method = "PROPFIND";
  req.path = "/not-dav";

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, CustomRouteUnregisteredMethodIsRejected) {
  Request req;
  req.method = "UNLOCK";
  req.path = "/dav/dir";

  cli_.set_keep_alive(true);
  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
  EXPECT_EQ("close", res->get_header_value("Connection"));
  EXPECT_FALSE(cli_.is_socket_open());
}

TEST_F(ServerTest, CustomRouteDoesNotServeStaticFiles) {
  // The mount point serves this path, but only for GET and HEAD.
  auto get_res = cli_.Get("/dir/index.html");
  ASSERT_TRUE(get_res) << "Error: " << to_string(get_res.error());
  ASSERT_EQ(StatusCode::OK_200, get_res->status);

  Request req;
  req.method = "PROPFIND";
  req.path = "/dir/index.html";

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST_F(ServerTest, CustomRouteKeepAlive) {
  const std::string xml = R"(<?xml version="1.0"?><propfind/>)";

  cli_.set_keep_alive(true);

  for (auto i = 0; i < 2; i++) {
    Request req;
    req.method = "PROPFIND";
    req.path = "/dav/dir";
    req.body = xml;

    auto res = cli_.send(req);

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
    EXPECT_EQ(xml, res->body);
    EXPECT_TRUE(cli_.is_socket_open());
  }

  // A built-in method must still be served on the same connection.
  cli_.set_keep_alive(false);

  auto res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("close", res->get_header_value("Connection"));
}

TEST_F(ServerTest, CustomRouteExpect100Continue) {
  const std::string xml = R"(<?xml version="1.0"?><propfind/>)";

  Request req;
  req.method = "PROPFIND";
  req.path = "/dav/dir";
  req.set_header("Expect", "100-continue");
  req.body = xml;

  auto res = cli_.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MultiStatus_207, res->status);
  EXPECT_EQ(xml, res->body);
}

TEST_F(ServerTest, StartTime) { auto res = cli_.Get("/test-start-time"); }

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST_F(ServerTest, Gzip) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");
  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("33", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, GzipWithContentTypeParameters) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");
  auto res = cli_.Get("/compress-with-charset", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("application/json; charset=utf-8",
            res->get_header_value("Content-Type"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, GzipWithoutAcceptEncoding) {
  Headers headers;
  headers.emplace("Accept-Encoding", "");
  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(res->get_header_value("Content-Encoding").empty());
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, GzipWithContentReceiver) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");
  std::string body;
  auto res =
      cli_.Get("/compress", headers, [&](const char *data, size_t data_length) {
        EXPECT_EQ(100U, data_length);
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("33", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, GzipWithoutDecompressing) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");

  cli_.set_decompress(false);
  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("33", res->get_header_value("Content-Length"));
  EXPECT_EQ(33U, res->body.size());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, GzipWithContentReceiverWithoutAcceptEncoding) {
  Headers headers;
  headers.emplace("Accept-Encoding", "");

  std::string body;
  auto res =
      cli_.Get("/compress", headers, [&](const char *data, size_t data_length) {
        EXPECT_EQ(100U, data_length);
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(res->get_header_value("Content-Encoding").empty());
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, NoGzip) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");
  auto res = cli_.Get("/nocompress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(false, res->has_header("Content-Encoding"));
  EXPECT_EQ("application/octet-stream", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, NoGzipWithContentReceiver) {
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip, deflate");
  std::string body;
  auto res = cli_.Get("/nocompress", headers,
                      [&](const char *data, size_t data_length) {
                        EXPECT_EQ(100U, data_length);
                        body.append(data, data_length);
                        return true;
                      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(false, res->has_header("Content-Encoding"));
  EXPECT_EQ("application/octet-stream", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, MultipartFormDataGzip) {
  UploadFormDataItems items = {
      {"key1", "test", "", ""},
      {"key2", "--abcdefg123", "", ""},
  };

  cli_.set_compress(true);
  auto res = cli_.Post("/compress-multipart", items);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}
#endif

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
// Static file compression is opt-in, so these run their own server rather than
// flipping it on for the shared ServerTest fixture, which would silently
// rewrite what every other static file test is asserting.
class StaticFileCompressionTest : public ::testing::Test {
protected:
  void TearDown() override {
    if (t_.joinable()) {
      svr_.stop();
      t_.join();
    }
  }

  int start(const std::function<void(Server &)> &configure = nullptr) {
    // Serves the same tree as a directory of build-time compressed assets
    // would be served: the mount point names the coding the files are already
    // stored in. Registered before "/" so it is the one that matches.
    svr_.set_mount_point("/pre-encoded", "./www",
                         {{"Content-Encoding", "gzip"}});

    svr_.set_mount_point("/", "./www");

    svr_.Get("/file_content", [](const Request & /*req*/, Response &res) {
      res.set_file_content("./www/dir/index.html", "text/html");
    });

    svr_.Get("/pre-encoded-file-content",
             [](const Request & /*req*/, Response &res) {
               res.set_header("Content-Encoding", "gzip");
               res.set_file_content("./www/dir/index.html", "text/html");
             });

    svr_.Get("/streamed", [](const Request & /*req*/, Response &res) {
      res.set_content_provider(
          6, "text/plain",
          [](size_t offset, size_t /*length*/, DataSink &sink) {
            sink.write(offset < 3 ? "aaa" : "bbb", 3);
            return true;
          });
    });

    svr_.Get("/slow-stream", [](const Request & /*req*/, Response &res) {
      res.set_content_provider(
          1000, "text/plain",
          [](size_t offset, size_t /*length*/, DataSink &sink) {
            if (offset < 100) {
              std::string data(100, 'A');
              sink.write(data.data(), data.size());
              return true;
            }
            std::this_thread::sleep_for(std::chrono::seconds(2));
            std::string data(900, 'B');
            sink.write(data.data(), data.size());
            return true;
          });
    });

    if (configure) { configure(svr_); }

    auto port = svr_.bind_to_any_port(HOST);
    t_ = std::thread([&]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
    return port;
  }

  static void enable(Server &svr) { svr.set_static_file_compression(true); }

  // Every file under ./www except 1MB.txt is smaller than the default
  // 1400-byte floor, so a test that needs a small file compressed has to lower
  // it out of the way.
  static void enable_without_floor(Server &svr) {
    svr.set_static_file_compression(true);
    svr.set_static_file_compression_min_length(0);
  }

  Server svr_;
  std::thread t_;
};

TEST_F(StaticFileCompressionTest, DisabledByDefault) {
  auto port = start();

  Client cli(HOST, port);
  auto res = cli.Get("/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_FALSE(res->has_header("Content-Encoding"));
  EXPECT_EQ("1048576", res->get_header_value("Content-Length"));
  EXPECT_EQ(1048576U, res->body.size());
}

TEST_F(StaticFileCompressionTest, MountPoint) {
  auto port = start(enable);

  Client cli(HOST, port);
  cli.set_decompress(false);
  auto res = cli.Get("/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("Accept-Encoding", res->get_header_value("Vary"));
  // The response stays self-delimiting: a length, not a chunked body.
  EXPECT_FALSE(res->has_header("Transfer-Encoding"));
  EXPECT_EQ(std::to_string(res->body.size()),
            res->get_header_value("Content-Length"));
  EXPECT_LT(res->body.size(), 1048576U);
  EXPECT_FALSE(res->body.empty());
}

TEST_F(StaticFileCompressionTest, MountPointDecompressed) {
  auto port = start(enable);

  Client cli(HOST, port);
  auto res = cli.Get("/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ(1048576U, res->body.size());
}

TEST_F(StaticFileCompressionTest, FileContent) {
  auto port = start(enable_without_floor);

  Client cli(HOST, port);
  auto res = cli.Get("/file_content", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_EQ(104U, res->body.size());
}

// A handler that serves an already-encoded file names the coding itself. The
// file-backed path decided its coding from Accept-Encoding and the content
// type alone, so it compressed the stored bytes a second time and appended a
// second Content-Encoding field line.
TEST_F(StaticFileCompressionTest, PreEncodedFileContentIsNotCompressedAgain) {
  auto port = start(enable_without_floor);

  Client cli(HOST, port);
  cli.set_decompress(false);
  auto res = cli.Get("/pre-encoded-file-content",
                     Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(1U, res->get_header_value_count("Content-Encoding"));
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  // Vary belongs to a coding the server chose, and it chose none here.
  EXPECT_FALSE(res->has_header("Vary"));
  // The file travels exactly as it is stored on disk.
  EXPECT_EQ(104U, res->body.size());
}

// The 1MB file clears the default floor, so this one runs the configuration a
// deployment would actually have.
TEST_F(StaticFileCompressionTest, PreEncodedMountPointIsNotCompressedAgain) {
  auto port = start(enable);

  Client cli(HOST, port);
  cli.set_decompress(false);
  auto res =
      cli.Get("/pre-encoded/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(1U, res->get_header_value_count("Content-Encoding"));
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_FALSE(res->has_header("Vary"));
  EXPECT_EQ(1048576U, res->body.size());
  EXPECT_EQ("1048576", res->get_header_value("Content-Length"));
}

TEST_F(StaticFileCompressionTest, Head) {
  auto port = start(enable);

  Client cli(HOST, port);
  cli.set_decompress(false);
  auto get = cli.Get("/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(get) << "Error: " << to_string(get.error());

  auto res = cli.Head("/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
  EXPECT_FALSE(res->has_header("Transfer-Encoding"));
  // HEAD still reports the size a GET would return.
  EXPECT_EQ(get->get_header_value("Content-Length"),
            res->get_header_value("Content-Length"));
  EXPECT_TRUE(res->body.empty());
}

TEST_F(StaticFileCompressionTest, RangeStaysIdentity) {
  auto port = start(enable);

  Client cli(HOST, port);
  auto res = cli.Get("/dir/test.abcde", Headers{make_range_header({{2, 3}}),
                                                {"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  EXPECT_FALSE(res->has_header("Content-Encoding"));
  EXPECT_EQ("2", res->get_header_value("Content-Length"));
  EXPECT_EQ("bytes 2-3/5", res->get_header_value("Content-Range"));
  EXPECT_EQ("cd", res->body);
}

TEST_F(StaticFileCompressionTest, NotCompressibleType) {
  auto port = start(enable);

  Client cli(HOST, port);
  auto res = cli.Get("/file", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("application/octet-stream", res->get_header_value("Content-Type"));
  EXPECT_FALSE(res->has_header("Content-Encoding"));
  EXPECT_EQ("5", res->get_header_value("Content-Length"));
}

TEST_F(StaticFileCompressionTest, EmptyFile) {
  auto port = start(enable);

  Client cli(HOST, port);
  auto res = cli.Get("/empty_file", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_FALSE(res->has_header("Content-Encoding"));
  EXPECT_EQ("0", res->get_header_value("Content-Length"));
  EXPECT_TRUE(res->body.empty());
}

TEST_F(StaticFileCompressionTest, MinLength) {
  auto port = start(enable);

  Client cli(HOST, port);

  // 104 bytes, well under the default floor. Compressing it would add the
  // gzip header and trailer to a body that already fits in one packet.
  auto res = cli.Get("/dir/index.html", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_FALSE(res->has_header("Content-Encoding"));
  EXPECT_EQ("104", res->get_header_value("Content-Length"));
}

TEST_F(StaticFileCompressionTest, MinLengthLowered) {
  auto port = start([](Server &svr) {
    svr.set_static_file_compression(true);
    svr.set_static_file_compression_min_length(1);
  });

  Client cli(HOST, port);
  cli.set_decompress(false);

  auto res = cli.Get("/dir/test.html", Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));

  // A 9-byte file comes back larger than it went in, because gzip's header and
  // trailer outweigh anything deflate can save. That is the end of the range
  // the floor exists to keep out.
  EXPECT_GT(res->body.size(), 9U);
}

TEST_F(StaticFileCompressionTest, MaxLength) {
  auto port = start([](Server &svr) {
    svr.set_static_file_compression(true);
    svr.set_static_file_compression_min_length(0);
    svr.set_static_file_compression_max_length(1024);
  });

  Client cli(HOST, port);

  // Over the limit: served as is. Not named `big`/`small`: <rpcndr.h>
  // defines `small` as a macro on Windows.
  auto over = cli.Get("/dir/1MB.txt", Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(over) << "Error: " << to_string(over.error());
  EXPECT_FALSE(over->has_header("Content-Encoding"));
  EXPECT_EQ("1048576", over->get_header_value("Content-Length"));

  // Under it: compressed.
  auto under = cli.Get("/dir/index.html", Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(under) << "Error: " << to_string(under.error());
  EXPECT_EQ("gzip", under->get_header_value("Content-Encoding"));
}

TEST_F(StaticFileCompressionTest, EtagPerEncoding) {
  auto port = start(enable_without_floor);

  Client cli(HOST, port);

  auto identity = cli.Get("/dir/index.html", Headers{{"Accept-Encoding", ""}});
  ASSERT_TRUE(identity) << "Error: " << to_string(identity.error());
  EXPECT_FALSE(identity->has_header("Content-Encoding"));
  auto identity_etag = identity->get_header_value("ETag");
  ASSERT_FALSE(identity_etag.empty());

  auto gzipped =
      cli.Get("/dir/index.html", Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(gzipped) << "Error: " << to_string(gzipped.error());
  EXPECT_EQ("gzip", gzipped->get_header_value("Content-Encoding"));
  auto gzip_etag = gzipped->get_header_value("ETag");
  ASSERT_FALSE(gzip_etag.empty());

  // Two representations, two validators.
  EXPECT_NE(identity_etag, gzip_etag);

  // Each one revalidates against the request that would produce it...
  auto fresh =
      cli.Get("/dir/index.html", Headers{{"Accept-Encoding", "gzip"},
                                         {"If-None-Match", gzip_etag}});
  ASSERT_TRUE(fresh) << "Error: " << to_string(fresh.error());
  EXPECT_EQ(StatusCode::NotModified_304, fresh->status);

  auto fresh_identity =
      cli.Get("/dir/index.html", Headers{{"Accept-Encoding", ""},
                                         {"If-None-Match", identity_etag}});
  ASSERT_TRUE(fresh_identity) << "Error: " << to_string(fresh_identity.error());
  EXPECT_EQ(StatusCode::NotModified_304, fresh_identity->status);

  // ...and not against the other representation.
  auto crossed =
      cli.Get("/dir/index.html",
              Headers{{"Accept-Encoding", ""}, {"If-None-Match", gzip_etag}});
  ASSERT_TRUE(crossed) << "Error: " << to_string(crossed.error());
  EXPECT_EQ(StatusCode::OK_200, crossed->status);
}

// The opt-in covers responses the server reads off disk itself. A caller's own
// known-length provider keeps its Content-Length and, more importantly, keeps
// delivering incrementally: routing it through a compressor would hold every
// write back until zlib's window filled.
TEST_F(StaticFileCompressionTest, KnownLengthProviderUnaffected) {
  auto port = start(enable);

  Client cli(HOST, port);
  auto res = cli.Get("/streamed", Headers{{"Accept-Encoding", "gzip"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_FALSE(res->has_header("Content-Encoding"));
  EXPECT_EQ("6", res->get_header_value("Content-Length"));
  EXPECT_EQ("aaabbb", res->body);
}

TEST_F(StaticFileCompressionTest, IncrementalProviderUnaffected) {
  auto port = start(enable);

  Client cli(HOST, port);
  cli.set_read_timeout(1, 0);

  auto handle = cli.open_stream("GET", "/slow-stream", Params{},
                                Headers{{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(handle.is_valid());

  // The provider writes 100 bytes and then stalls for longer than the read
  // timeout. Those first bytes have to arrive anyway: run the response through
  // a compressor and zlib holds them until its window fills, so the read would
  // come back empty instead.
  char buf[256];
  auto n = handle.read(buf, sizeof(buf));
  ASSERT_GT(n, 0) << "first read should return the bytes already written";
  EXPECT_EQ(std::string(100, 'A'), std::string(buf, static_cast<size_t>(n)));
}
#endif

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
TEST_F(ServerTest, Brotli) {
  Headers headers;
  headers.emplace("Accept-Encoding", "br");
  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("br", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("19", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}
#endif

#ifdef CPPHTTPLIB_ZSTD_SUPPORT
TEST_F(ServerTest, Zstd) {
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");
  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("zstd", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("26", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, ZstdWithoutAcceptEncoding) {
  Headers headers;
  headers.emplace("Accept-Encoding", "");
  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(res->get_header_value("Content-Encoding").empty());
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, ZstdWithContentReceiver) {
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");
  std::string body;
  auto res =
      cli_.Get("/compress", headers, [&](const char *data, size_t data_length) {
        EXPECT_EQ(100U, data_length);
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("zstd", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("26", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, ZstdWithoutDecompressing) {
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");

  cli_.set_decompress(false);
  auto res = cli_.Get("/compress", headers);

  unsigned char compressed[26] = {0x28, 0xb5, 0x2f, 0xfd, 0x20, 0x64, 0x8d,
                                  0x00, 0x00, 0x50, 0x31, 0x32, 0x33, 0x34,
                                  0x35, 0x36, 0x37, 0x38, 0x39, 0x30, 0x01,
                                  0x00, 0xd7, 0xa9, 0x20, 0x01};

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("zstd", res->get_header_value("Content-Encoding"));
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("26", res->get_header_value("Content-Length"));
  EXPECT_EQ(StatusCode::OK_200, res->status);
  ASSERT_EQ(26U, res->body.size());
  EXPECT_TRUE(std::memcmp(compressed, res->body.data(), sizeof(compressed)) ==
              0);
}

TEST_F(ServerTest, ZstdWithContentReceiverWithoutAcceptEncoding) {
  Headers headers;
  headers.emplace("Accept-Encoding", "");

  std::string body;
  auto res =
      cli_.Get("/compress", headers, [&](const char *data, size_t data_length) {
        EXPECT_EQ(100U, data_length);
        body.append(data, data_length);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(res->get_header_value("Content-Encoding").empty());
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, NoZstd) {
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");
  auto res = cli_.Get("/nocompress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(false, res->has_header("Content-Encoding"));
  EXPECT_EQ("application/octet-stream", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            res->body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, NoZstdWithContentReceiver) {
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");
  std::string body;
  auto res = cli_.Get("/nocompress", headers,
                      [&](const char *data, size_t data_length) {
                        EXPECT_EQ(100U, data_length);
                        body.append(data, data_length);
                        return true;
                      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(false, res->has_header("Content-Encoding"));
  EXPECT_EQ("application/octet-stream", res->get_header_value("Content-Type"));
  EXPECT_EQ("100", res->get_header_value("Content-Length"));
  EXPECT_EQ("123456789012345678901234567890123456789012345678901234567890123456"
            "7890123456789012345678901234567890",
            body);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

// TODO: How to enable zstd ??
TEST_F(ServerTest, MultipartFormDataZstd) {
  UploadFormDataItems items = {
      {"key1", "test", "", ""},
      {"key2", "--abcdefg123", "", ""},
  };
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");

  cli_.set_compress(true);
  auto res = cli_.Post("/compress-multipart", headers, items);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(ServerTest, PutWithContentProviderWithZstd) {
  Headers headers;
  headers.emplace("Accept-Encoding", "zstd");

  cli_.set_compress(true);
  auto res = cli_.Put(
      "/put", headers, 3,
      [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.os << "PUT";
        return true;
      },
      "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("PUT", res->body);
}

// Pre-compression logging tests
TEST_F(ServerTest, PreCompressionLogging) {
  // Test data for compression (matches the actual /compress endpoint content)
  const std::string test_content =
      "123456789012345678901234567890123456789012345678901234567890123456789012"
      "3456789012345678901234567890";

  // Variables to capture logging data
  std::string pre_compression_body;
  std::string pre_compression_content_type;
  std::string pre_compression_content_encoding;

  std::string post_compression_body;
  std::string post_compression_content_type;
  std::string post_compression_content_encoding;

  // Set up pre-compression logger
  svr_.set_pre_compression_logger([&](const Request & /*req*/,
                                      const Response &res) {
    pre_compression_body = res.body;
    pre_compression_content_type = res.get_header_value("Content-Type");
    pre_compression_content_encoding = res.get_header_value("Content-Encoding");
  });

  // Set up post-compression logger
  svr_.set_logger([&](const Request & /*req*/, const Response &res) {
    post_compression_body = res.body;
    post_compression_content_type = res.get_header_value("Content-Type");
    post_compression_content_encoding =
        res.get_header_value("Content-Encoding");
  });

  // Test with gzip compression
  Headers headers;
  headers.emplace("Accept-Encoding", "gzip");

  auto res = cli_.Get("/compress", headers);

  // Verify response was compressed
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));

  // Verify pre-compression logger captured uncompressed content
  EXPECT_EQ(test_content, pre_compression_body);
  EXPECT_EQ("text/plain", pre_compression_content_type);
  EXPECT_TRUE(pre_compression_content_encoding
                  .empty()); // No encoding header before compression

  // Verify post-compression logger captured compressed content
  EXPECT_NE(test_content,
            post_compression_body); // Should be different after compression
  EXPECT_EQ("text/plain", post_compression_content_type);
  EXPECT_EQ("gzip", post_compression_content_encoding);

  // Verify compressed content is smaller
  EXPECT_LT(post_compression_body.size(), pre_compression_body.size());
}

TEST_F(ServerTest, PreCompressionLoggingWithBrotli) {
  const std::string test_content =
      "123456789012345678901234567890123456789012345678901234567890123456789012"
      "3456789012345678901234567890";

  std::string pre_compression_body;
  std::string post_compression_body;

  svr_.set_pre_compression_logger(
      [&](const Request & /*req*/, const Response &res) {
        pre_compression_body = res.body;
      });

  svr_.set_logger([&](const Request & /*req*/, const Response &res) {
    post_compression_body = res.body;
  });

  Headers headers;
  headers.emplace("Accept-Encoding", "br");

  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("br", res->get_header_value("Content-Encoding"));

  // Verify pre-compression content is uncompressed
  EXPECT_EQ(test_content, pre_compression_body);

  // Verify post-compression content is compressed
  EXPECT_NE(test_content, post_compression_body);
  EXPECT_LT(post_compression_body.size(), pre_compression_body.size());
}

TEST_F(ServerTest, PreCompressionLoggingWithoutCompression) {
  const std::string test_content =
      "123456789012345678901234567890123456789012345678901234567890123456789012"
      "3456789012345678901234567890";

  std::string pre_compression_body;
  std::string post_compression_body;

  svr_.set_pre_compression_logger(
      [&](const Request & /*req*/, const Response &res) {
        pre_compression_body = res.body;
      });

  svr_.set_logger([&](const Request & /*req*/, const Response &res) {
    post_compression_body = res.body;
  });

  // Request without compression (use /nocompress endpoint)
  Headers headers;
  auto res = cli_.Get("/nocompress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_TRUE(res->get_header_value("Content-Encoding").empty());

  // Pre-compression logger should not be called when no compression is applied
  EXPECT_TRUE(
      pre_compression_body.empty()); // Pre-compression logger not called
  EXPECT_EQ(
      test_content,
      post_compression_body); // Post-compression logger captures final content
}

TEST_F(ServerTest, LoggerSeesContentLength) {
  size_t logged_content_length = 0;
  std::string logged_content_length_header;

  svr_.set_logger([&](const Request & /*req*/, const Response &res) {
    logged_content_length = res.content_length_;
    logged_content_length_header = res.get_header_value("Content-Length");
  });

  auto res = cli_.Get("/nocompress");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(res->body.size(), logged_content_length);
  EXPECT_EQ(std::to_string(logged_content_length),
            logged_content_length_header);
}

TEST_F(ServerTest, PreCompressionLoggingOnlyPreLogger) {
  const std::string test_content =
      "123456789012345678901234567890123456789012345678901234567890123456789012"
      "3456789012345678901234567890";

  std::string pre_compression_body;
  bool pre_logger_called = false;

  // Set only pre-compression logger
  svr_.set_pre_compression_logger(
      [&](const Request & /*req*/, const Response &res) {
        pre_compression_body = res.body;
        pre_logger_called = true;
      });

  Headers headers;
  headers.emplace("Accept-Encoding", "gzip");

  auto res = cli_.Get("/compress", headers);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));

  // Verify pre-compression logger was called
  EXPECT_TRUE(pre_logger_called);
  EXPECT_EQ(test_content, pre_compression_body);
}

TEST_F(ServerTest, SendLargeBodyAfterRequestLineError) {
  {
    // Test with Expect: 100-continue header - success case
    // Server returns 100 Continue, client sends body, server returns 200 OK
    Request req;
    req.method = "POST";
    req.path = "/post-large";
    req.set_header("Expect", "100-continue");
    req.body = LARGE_DATA;

    Response res;
    auto error = Error::Success;

    cli_.set_keep_alive(true);
    auto ret = cli_.send(req, res, error);

    EXPECT_TRUE(ret);
    EXPECT_EQ(StatusCode::OK_200, res.status);
    EXPECT_EQ(LARGE_DATA, res.body);
  }

  {
    // Test with Expect: 100-continue header - error case
    // Client should not send the body when server returns an error
    Request req;
    req.method = "POST";
    req.path = "/post-large?q=" + LONG_QUERY_VALUE;
    req.set_header("Expect", "100-continue");
    req.body = LARGE_DATA;

    Response res;
    auto error = Error::Success;

    auto start = std::chrono::high_resolution_clock::now();
    cli_.set_keep_alive(true);
    auto ret = cli_.send(req, res, error);
    auto end = std::chrono::high_resolution_clock::now();

    auto elapsed =
        std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
            .count();

    // With Expect: 100-continue, request completes successfully but with error
    EXPECT_TRUE(ret);
    EXPECT_EQ(StatusCode::UriTooLong_414, res.status);
    EXPECT_EQ("close", res.get_header_value("Connection"));
    EXPECT_FALSE(cli_.is_socket_open());
    EXPECT_LE(elapsed, 2000);
  }

  {
    // Send an extra GET request to ensure error recovery without hanging
    Request req;
    req.method = "GET";
    req.path = "/hi";

    auto start = std::chrono::high_resolution_clock::now();
    auto res = cli_.send(req);
    auto end = std::chrono::high_resolution_clock::now();

    auto elapsed =
        std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
            .count();

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("Hello World!", res->body);
    EXPECT_LE(elapsed, 500);
  }
}

TEST(ZstdDecompressor, ChunkedDecompression) {
  std::string data;
  for (size_t i = 0; i < 32 * 1024; ++i) {
    data.push_back(static_cast<char>('a' + i % 26));
  }

  std::string compressed_data;
  {
    httplib::detail::zstd_compressor compressor;
    bool result = compressor.compress(
        data.data(), data.size(),
        /*last=*/true,
        [&](const char *compressed_data_chunk, size_t compressed_data_size) {
          compressed_data.insert(compressed_data.size(), compressed_data_chunk,
                                 compressed_data_size);
          return true;
        });
    ASSERT_TRUE(result);
  }

  std::string decompressed_data;
  {
    httplib::detail::zstd_decompressor decompressor;

    // Chunk size is chosen specifically to have a decompressed chunk size equal
    // to 16384 bytes 16384 bytes is the size of decompressor output buffer
    size_t chunk_size = 130;
    for (size_t chunk_begin = 0; chunk_begin < compressed_data.size();
         chunk_begin += chunk_size) {
      size_t current_chunk_size =
          std::min(compressed_data.size() - chunk_begin, chunk_size);
      bool result = decompressor.decompress(
          compressed_data.data() + chunk_begin, current_chunk_size,
          [&](const char *decompressed_data_chunk,
              size_t decompressed_data_chunk_size) {
            decompressed_data.insert(decompressed_data.size(),
                                     decompressed_data_chunk,
                                     decompressed_data_chunk_size);
            return true;
          });
      ASSERT_TRUE(result);
    }
  }
  ASSERT_EQ(data, decompressed_data);
}

TEST(ZstdDecompressor, Decompress) {
  std::string original_text = "Compressed with ZSTD";
  unsigned char data[29] = {0x28, 0xb5, 0x2f, 0xfd, 0x20, 0x14, 0xa1, 0x00,
                            0x00, 0x43, 0x6f, 0x6d, 0x70, 0x72, 0x65, 0x73,
                            0x73, 0x65, 0x64, 0x20, 0x77, 0x69, 0x74, 0x68,
                            0x20, 0x5a, 0x53, 0x54, 0x44};
  std::string compressed_data(data, data + sizeof(data) / sizeof(data[0]));

  std::string decompressed_data;
  {
    httplib::detail::zstd_decompressor decompressor;

    bool result = decompressor.decompress(
        compressed_data.data(), compressed_data.size(),
        [&](const char *decompressed_data_chunk,
            size_t decompressed_data_chunk_size) {
          decompressed_data.insert(decompressed_data.size(),
                                   decompressed_data_chunk,
                                   decompressed_data_chunk_size);
          return true;
        });
    ASSERT_TRUE(result);
  }
  ASSERT_EQ(original_text, decompressed_data);
}
#endif

// Sends a raw request to a server listening at HOST:PORT, writing it in
// separate chunks so that the server sees each part in its own read(). Used to
// place a read boundary at a specific offset of a request body.
static bool send_request_in_parts(time_t read_timeout_sec,
                                  const std::vector<std::string> &parts,
                                  std::string *resp = nullptr,
                                  int port = PORT) {
  auto error = Error::Success;

  auto client_sock = detail::create_client_socket(
      HOST, "", port, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/5, 0,
      /*read_timeout_sec=*/5, 0,
      /*write_timeout_sec=*/5, 0, std::string(), error);

  if (client_sock == INVALID_SOCKET) { return false; }

  auto ret = detail::process_client_socket(
      client_sock, read_timeout_sec, 0, 0, 0, 0,
      std::chrono::steady_clock::time_point::min(), [&](Stream &strm) {
        for (size_t i = 0; i < parts.size(); i++) {
          const auto &part = parts[i];
          if (part.size() !=
              static_cast<size_t>(strm.write(part.data(), part.size()))) {
            return false;
          }
          if (i + 1 < parts.size()) {
            std::this_thread::sleep_for(std::chrono::milliseconds(100));
          }
        }

        char buf[512];

        detail::stream_line_reader line_reader(strm, buf, sizeof(buf));
        while (line_reader.getline()) {
          if (resp) { *resp += line_reader.ptr(); }
        }
        return true;
      });

  detail::close_socket(client_sock);

  return ret;
}

// Sends a raw request to a server listening at HOST:PORT.
static bool send_request(time_t read_timeout_sec, const std::string &req,
                         std::string *resp = nullptr, int port = PORT) {
  return send_request_in_parts(read_timeout_sec, {req}, resp, port);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(SSLClientServerTest, ReadTimeoutBoundsTheWholeHandshake) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.set_read_timeout(1, 0);

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // The start of a TLS record, then the rest of it a byte every 100 ms, which
  // keeps each wait well within the read timeout. The server gives up a
  // second in, so the bytes sent after that fail.
  std::vector<std::string> parts{std::string("\x16\x03\x01\x00\xff", 5)};
  parts.resize(26, std::string(1, '\0'));
  EXPECT_FALSE(send_request_in_parts(5, parts));
}
#endif

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
// send_request_in_parts() over TLS, each part in a TLS record of its own.
static bool send_ssl_request_in_parts(time_t read_timeout_sec,
                                      const std::vector<std::string> &parts,
                                      std::string *resp = nullptr,
                                      int port = PORT) {
  auto error = Error::Success;
  auto sock = detail::create_client_socket(
      HOST, "", port, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/5, 0, read_timeout_sec, 0,
      /*write_timeout_sec=*/5, 0, std::string(), error);
  if (sock == INVALID_SOCKET) { return false; }
  auto sock_se = detail::scope_exit([&] { detail::close_socket(sock); });

  auto ctx = SSL_CTX_new(TLS_client_method());
  auto ssl = SSL_new(ctx);
  auto ssl_se = detail::scope_exit([&] {
    SSL_free(ssl);
    SSL_CTX_free(ctx);
  });
  SSL_set_fd(ssl, static_cast<int>(sock));
  if (SSL_connect(ssl) != 1) { return false; }

  for (size_t i = 0; i < parts.size(); i++) {
    const auto &part = parts[i];
    if (SSL_write(ssl, part.data(), static_cast<int>(part.size())) !=
        static_cast<int>(part.size())) {
      return false;
    }
    if (i + 1 < parts.size()) {
      std::this_thread::sleep_for(std::chrono::milliseconds(100));
    }
  }

  char buf[512];
  int n;
  while ((n = SSL_read(ssl, buf, sizeof(buf))) > 0) {
    if (resp) { resp->append(buf, static_cast<size_t>(n)); }
  }
  return true;
}
#endif

// The request line, then a header value a byte at a time.
static std::vector<std::string> slow_request_head_parts() {
  std::vector<std::string> parts{"GET / HTTP/1.1\r\nHost: x\r\nX-Slow: "};
  parts.resize(26, "a");
  parts.emplace_back("\r\n\r\n");
  return parts;
}

// `send` takes 2.5 seconds over slow_request_head_parts(), each wait well
// within the one-second read timeout. The server gives up a second in, before
// the head is complete.
static void
expect_slow_request_head_dropped(Server &svr,
                                 const std::function<std::string()> &send) {
  std::atomic<bool> handled(false);
  svr.Get("/", [&](const Request &, Response &res) {
    handled = true;
    res.set_content("ok", "text/plain");
  });
  svr.set_read_timeout(1, 0);

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  auto resp = send();
  EXPECT_FALSE(handled);
  EXPECT_EQ(std::string::npos, resp.find("200 OK"));
}

TEST(ServerRequestParsingTest, ReadTimeoutBoundsTheWholeRequestHead) {
  Server svr;
  expect_slow_request_head_dropped(svr, [] {
    std::string resp;
    send_request_in_parts(5, slow_request_head_parts(), &resp);
    return resp;
  });
}

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
TEST(SSLClientServerTest, ReadTimeoutBoundsTheWholeRequestHead) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  expect_slow_request_head_dropped(svr, [] {
    std::string resp;
    send_ssl_request_in_parts(5, slow_request_head_parts(), &resp);
    return resp;
  });
}
#endif

TEST(ServerRequestParsingTest, TrimWhitespaceFromHeaderValues) {
  Server svr;
  std::string header_value;
  svr.Get("/validate-ws-in-headers", [&](const Request &req, Response &res) {
    header_value = req.get_header_value("foo");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Only space and horizontal tab are whitespace. Make sure other whitespace-
  // like characters are not treated the same - use vertical tab and escape.
  const std::string req = "GET /validate-ws-in-headers HTTP/1.1\r\n"
                          "foo: \t \v bar \x1B\t \r\n"
                          "Connection: close\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res));
  EXPECT_EQ(header_value, "");
  EXPECT_EQ("HTTP/1.1 400 Bad Request", res.substr(0, 24));
}

TEST(HeadersOrderTest, ReceivedFieldsKeepTheirOrder) {
  Server svr;
  std::string received;
  svr.Get("/order", [&](const Request &req, Response &res) {
    received = entries_to_string(req.headers);
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = "GET /order HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "X-First: 1\r\n"
                          "X-Dup: a\r\n"
                          "X-Second: 2\r\n"
                          "X-Dup: b\r\n"
                          "Connection: close\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res, port));
  EXPECT_EQ("HTTP/1.1 200 OK", res.substr(0, 15));
  EXPECT_EQ(
      "Host=localhost X-First=1 X-Dup=a X-Second=2 X-Dup=b Connection=close ",
      received);
}

TEST(HeadersOrderTest, SentFieldsKeepTheirOrder) {
  Server svr;
  svr.Get("/cookies", [](const Request & /*req*/, Response &res) {
    res.set_header("Set-Cookie", "first=1");
    res.set_header("X-Between", "y");
    res.set_header("Set-Cookie", "second=2");
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get("/cookies");
  ASSERT_TRUE(res);
  EXPECT_EQ(2U, res->get_header_value_count("Set-Cookie"));
  EXPECT_EQ("first=1", res->get_header_value("Set-Cookie", "", 0));
  EXPECT_EQ("second=2", res->get_header_value("Set-Cookie", "", 1));
}

// A stream may send a byte at a time with a small extension on each chunk,
// however long it runs
TEST(ChunkOverheadTest, AcceptsSmallOverheadOnEveryChunk) {
  Server svr;
  svr.Post("/count", [](const Request &req, Response &res) {
    res.set_content(std::to_string(req.body.size()), "text/plain");
  });
  auto port = svr.bind_to_any_port(HOST);
  ASSERT_LT(0, port);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  std::string req = std::string("POST /count HTTP/1.1\r\nHost: ") + HOST +
                    "\r\nTransfer-Encoding: chunked\r\n"
                    "Connection: close\r\n\r\n";
  for (auto i = 0; i < 4096; i++) {
    req += "1;a=b\r\nx\r\n";
  }
  req += "0\r\n\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res, port));
  EXPECT_EQ(0u, res.find("HTTP/1.1 200 OK\r\n"));
  EXPECT_EQ("4096", res.substr(res.size() - 4));
}

TEST(ServerResponseSplittingTest, ChunkedTrailerCRLFInjection) {
  Server svr;
  svr.Get("/injected-trailer", [&](const Request & /*req*/, Response &res) {
    auto i = new int(0);
    res.set_header("Trailer", "X-Safe, X-Reflected");
    res.set_chunked_content_provider(
        "text/plain",
        [i](size_t /*offset*/, DataSink &sink) {
          if (*i == 0) {
            sink.os << "body";
          } else {
            Headers trailer;
            // A valid trailer that must survive.
            trailer.emplace("X-Safe", "safe");
            // Attacker-controlled value carrying CR/LF (response splitting).
            trailer.emplace("X-Reflected",
                            "legit\r\nInjected-Header: pwned\r\nX-Evil: also");
            // Attacker-controlled name carrying CR/LF.
            trailer.emplace("X-Bad\r\nSet-Cookie: a=1", "x");
            sink.done_with_trailer(trailer);
          }
          (*i)++;
          return true;
        },
        [i](bool /*success*/) { delete i; });
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = std::string("GET /injected-trailer HTTP/1.1\r\n") +
                          "Host: " + HOST +
                          "\r\n"
                          "Connection: close\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res));

  // The injected fields must not appear anywhere in the raw response.
  EXPECT_EQ(std::string::npos, res.find("Injected-Header"));
  EXPECT_EQ(std::string::npos, res.find("X-Evil"));
  EXPECT_EQ(std::string::npos, res.find("Set-Cookie"));

  // Invalid trailers are dropped entirely, matching set_header().
  EXPECT_EQ(std::string::npos, res.find("X-Reflected:"));

  // The valid trailer still passes through.
  EXPECT_NE(std::string::npos, res.find("X-Safe: safe"));
}

TEST(ServerResponseSplittingTest, ResponseHeaderCRLFInjection) {
  // A custom header writer gets only the fields the default one writes
  auto verbatim_writer = [](Stream &strm, Headers &hdrs) -> ssize_t {
    std::string s;
    for (const auto &h : hdrs) {
      s += h.first + ": " + h.second + "\r\n";
    }
    s += "\r\n";
    return strm.write(s.data(), s.size());
  };

  for (auto custom_writer : {false, true}) {
    SCOPED_TRACE(custom_writer ? "custom header writer" : "default writer");
    Server svr;
    if (custom_writer) { svr.set_header_writer(verbatim_writer); }
    svr.set_post_routing_handler([](const Request &, Response &res) {
      res.headers.emplace("X-Late", "late\r\nInjected-Late: pwned");
    });
    svr.Get("/injected-header", [&](const Request & /*req*/, Response &res) {
      // res.headers is a public field an application can populate directly,
      // bypassing set_header()'s validation (e.g. reflecting a request value).
      // A valid header that must survive.
      res.headers.emplace("X-Safe", "safe");
      // Attacker-controlled value carrying CR/LF (response splitting).
      res.headers.emplace("X-Reflected",
                          "legit\r\nInjected-Header: pwned\r\nX-Evil: also");
      // Attacker-controlled name carrying CR/LF.
      res.headers.emplace("X-Bad\r\nSet-Cookie: a=1", "x");
      res.set_content("body", "text/plain");
    });

    thread t = thread([&] { svr.listen(HOST, PORT); });
    auto se = detail::scope_exit([&] {
      svr.stop();
      t.join();
      ASSERT_FALSE(svr.is_running());
    });

    svr.wait_until_ready();

    const std::string req = std::string("GET /injected-header HTTP/1.1\r\n") +
                            "Host: " + HOST +
                            "\r\n"
                            "Connection: close\r\n"
                            "\r\n";

    std::string res;
    ASSERT_TRUE(send_request(5, req, &res));

    // The injected fields must not appear anywhere in the raw response.
    EXPECT_EQ(std::string::npos, res.find("Injected-Header"));
    EXPECT_EQ(std::string::npos, res.find("X-Evil"));
    EXPECT_EQ(std::string::npos, res.find("Set-Cookie"));
    EXPECT_EQ(std::string::npos, res.find("Injected-Late"));

    // Invalid headers are dropped entirely, matching set_header().
    EXPECT_EQ(std::string::npos, res.find("X-Reflected:"));

    // The valid header still passes through.
    EXPECT_NE(std::string::npos, res.find("X-Safe: safe"));
  }
}

// Forward declaration: in split builds split.py strips `inline` and moves the
// definition into httplib.cc, so detail::write_request_line is not visible from
// the public httplib.h. Re-declaring it here lets the tests link against the
// symbol in both header-only and split builds.
namespace httplib {
namespace detail {
ssize_t write_request_line(Stream &strm, const std::string &method,
                           const std::string &path);
} // namespace detail
} // namespace httplib

TEST(RequestLineInjectionTest, RejectsInvalidCharsInTarget) {
  // A well-formed target is written verbatim.
  {
    detail::BufferStream strm;
    auto n = detail::write_request_line(strm, "GET", "/path?a=b");
    EXPECT_GT(n, 0);
    EXPECT_EQ("GET /path?a=b HTTP/1.1\r\n", strm.get_buffer());
  }

  // A target carrying CR/LF, SP or other control octets must be rejected
  // before anything reaches the wire, otherwise it splits the request line and
  // injects a header or a whole request.
  const std::string evil_targets[] = {
      "/a\r\nInjected: pwned",
      "/a\rInjected",
      "/a\nInjected",
      "/a\r\n\r\nGET /evil HTTP/1.1\r\nHost: victim\r\n\r\n",
      "/a b",
      "/a\tb",
      "/a\x7f",
  };
  for (const auto &evil : evil_targets) {
    detail::BufferStream strm;
    auto n = detail::write_request_line(strm, "GET", evil);
    EXPECT_LT(n, 0);
    EXPECT_TRUE(strm.get_buffer().empty());
  }
}

TEST(RequestLineInjectionTest, ClientRejectsCRLFTargetEndToEnd) {
  // End-to-end counterpart to RejectsInvalidCharsInTarget. With path encoding
  // disabled the client transmits the target verbatim, so a CR/LF-bearing
  // target reaches write_request. The client must fail cleanly with
  // Error::Write instead of putting a request-line-less, header-injecting
  // request on the wire.
  Server svr;

  svr.Get("/a", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_path_encode(false);
    // The request is rejected before anything is written, so the connection
    // stays silent and the subsequent response read would otherwise block for
    // the full default read timeout. Shorten it -- the assertion is on the
    // error, not the timeout.
    cli.set_read_timeout(1, 0);

    auto res = cli.Get("/a\r\nInjected: pwned");
    EXPECT_FALSE(res);
    EXPECT_EQ(Error::Write, res.error());
  }
}

TEST(RequestLineInjectionTest, RejectsNonTokenMethod) {
  // Methods that are tokens (RFC 9110 Section 9.1) are written verbatim,
  // including extension methods.
  const std::string good_methods[] = {"GET", "PROPFIND", "M-SEARCH"};
  for (const auto &method : good_methods) {
    detail::BufferStream strm;
    auto n = detail::write_request_line(strm, method, "/");
    EXPECT_GT(n, 0);
    EXPECT_EQ(method + " / HTTP/1.1\r\n", strm.get_buffer());
  }

  // A method carrying CR/LF would split the request line and smuggle a whole
  // request ahead of the real one. A space or an empty method corrupts the
  // request line. All must be rejected before anything reaches the wire.
  const std::string evil_methods[] = {
      "GET /smuggled HTTP/1.1\r\nHost: x\r\n\r\nGET",
      "GET\r\nInjected: pwned",
      "GET\r",
      "GET\n",
      "GE T",
      "",
  };
  for (const auto &evil : evil_methods) {
    detail::BufferStream strm;
    auto n = detail::write_request_line(strm, evil, "/");
    EXPECT_LT(n, 0);
    EXPECT_TRUE(strm.get_buffer().empty());
  }
}

TEST(RequestLineInjectionTest, ClientRejectsNonTokenMethodEndToEnd) {
  // End-to-end counterpart to RejectsNonTokenMethod: a smuggling method passed
  // through Client::send must fail with Error::Write and no request, neither
  // the smuggled one nor the real one, may reach the server.
  Server svr;

  std::atomic<int> request_count(0);
  svr.set_pre_routing_handler([&](const Request &, Response &res) {
    request_count++;
    res.status = StatusCode::OK_200;
    return Server::HandlerResponse::Handled;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, port);

    const std::string evil_methods[] = {
        "GET /smuggled HTTP/1.1\r\nHost: x\r\n\r\nGET",
        "GE T",
        "",
    };
    for (const auto &evil : evil_methods) {
      Request req;
      req.method = evil;
      req.path = "/";
      auto res = cli.send(req);
      EXPECT_FALSE(res);
      EXPECT_EQ(Error::Write, res.error());
    }

    auto handle =
        cli.open_stream("GET /smuggled HTTP/1.1\r\nHost: x\r\n\r\nGET", "/");
    EXPECT_FALSE(handle.is_valid());
    EXPECT_EQ(Error::Write, handle.error);

    // A valid request on the same client still goes through.
    auto res = cli.Get("/");
    ASSERT_TRUE(res);
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  EXPECT_EQ(1, request_count.load());
}

// Sends a raw request and verifies that there isn't a crash or exception.
static void test_raw_request(const std::string &req,
                             std::string *out = nullptr) {
  Server svr;
  svr.Get("/hi", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });
  svr.Put("/put_hi", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });
  svr.Get("/header_field_value_check",
          [&](const Request & /*req*/, Response &res) {
            res.set_content("ok", "text/plain");
          });
  svr.CustomRoute("PROPFIND", "/dav",
                  [&](const Request & /*req*/, Response &res) {
                    res.status = StatusCode::MultiStatus_207;
                  });

  // Server read timeout must be longer than the client read timeout for the
  // bug to reproduce, probably to force the server to process a request
  // without a trailing blank line.
  const time_t client_read_timeout_sec = 1;
  svr.set_read_timeout(std::chrono::seconds(client_read_timeout_sec + 1));
  bool listen_thread_ok = false;
  thread t = thread([&] { listen_thread_ok = svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    EXPECT_TRUE(listen_thread_ok);
  });

  svr.wait_until_ready();

  ASSERT_TRUE(send_request(client_read_timeout_sec, req, out));
}

TEST(ServerRequestParsingTest, ReadHeadersRegexComplexity) {
  // A certain header line causes an exception if the header property is parsed
  // naively with a single regex. This occurs with libc++ but not libstdc++.
  test_raw_request(
      "GET /hi HTTP/1.1\r\n"
      " :                                                                      "
      "                                                                      "
      " ");
}

TEST(ServerRequestParsingTest, ReadHeadersRegexComplexity2) {
  // A certain header line causes an exception if the header property *name* is
  // parsed with a regular expression starting with "(.+?):" - this is a non-
  // greedy matcher and requires backtracking when there are a lot of ":"
  // characters.
  // This occurs with libc++ but not libstdc++.
  test_raw_request(
      "GET /hi HTTP/1.1\r\n"
      ":-:::::::::::::::::::::::::::-::::::::::::::::::::::::@-&&&&&&&&&&&"
      "--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@-&&&&&&&&"
      "&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@-:::::"
      "::-:::::::::::::::::@-&&&&&&&&&&&--:::::::-::::::::::::::::::::::::"
      ":::::-:::::::::::::::::@-&&&&&&&&&&&--:::::::-:::::::::::::::::::::"
      "::::::::-:::::::::::::::::@-&&&&&&&--:::::::-::::::::::::::::::::::"
      ":::::::-:::::::::::::::::@-&&&&&&&&&&&--:::::::-:::::::::::::::::::"
      "::::::::::-:::::::::::::::::@-&&&&&::::::::::::-:::::::::::::::::@-"
      "&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-::::::::::::::::"
      ":@-&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::"
      "::::@-&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-::::::@-&&"
      "&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@"
      "::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@-&&&&&&&&&&&"
      "--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@-&&&&&&&&"
      "&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@-&&&&&"
      "&&&&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@-&&"
      "&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::::@"
      "-&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::::"
      "::@-&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-::::::::::::"
      ":::::@-&&&&&&&&&&&::-:::::::::::::::::@-&&&&&&&&&&&--:::::::-::::::"
      ":::::::::::::::::::::::-:::::::::::::::::@-&&&&&&&&&&&--:::::::-:::"
      "::::::::::::::::::::::::::-:::::::::::::::::@-&&&&&&&&&&&--:::::::-"
      ":::::::::::::::::::::::::::::-:::::::::::::::::@-&&&&&&&&&&&---&&:&"
      "&&.0------------:-:::::::::::::::::::::::::::::-:::::::::::::::::@-"
      "&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-::::::::::::::::"
      ":@-&&&&&&&&&&&--:::::::-:::::::::::::::::::::::::::::-:::::::::::::"
      "::::@-&&&&&&&&&&&---&&:&&&.0------------O--------\rH PUTHTTP/1.1\r\n"
      "&&&%%%");
}

TEST(ServerRequestParsingTest, ExcessiveWhitespaceInUnparsableHeaderLine) {
  // Make sure this doesn't crash the server.
  // In a previous version of the header line regex, the "\r" rendered the line
  // unparsable and the regex engine repeatedly backtracked, trying to look for
  // a new position where the leading white space ended and the field value
  // began.
  // The crash occurs with libc++ but not libstdc++.
  test_raw_request("GET /hi HTTP/1.1\r\n"
                   "a:" +
                   std::string(2000, ' ') + '\r' + std::string(20, 'z') +
                   "\r\n"
                   "\r\n");
}

TEST(ServerRequestParsingTest, StrictRequestLine) {
  const char *rejected[] = {
      // RFC 9112 §3: one SP between the parts, and nothing else
      "GET  /hi HTTP/1.1\r\nHost: localhost\r\n\r\n",
      "GET\t/hi HTTP/1.1\r\nHost: localhost\r\n\r\n",
      "GET /hi\tHTTP/1.1\r\nHost: localhost\r\n\r\n",
      "GET /hi HTTP/1.1 \r\nHost: localhost\r\n\r\n",
      // A request-target has no fragment
      "GET /hi#x HTTP/1.1\r\nHost: localhost\r\n\r\n",
      // An HTTP/1.1 request needs a Host
      "GET /hi HTTP/1.1\r\n\r\n",
  };
  for (auto request : rejected) {
    std::string out;
    test_raw_request(request, &out);
    EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24)) << request;
  }

  std::string out;
  test_raw_request("GET /hi HTTP/1.0\r\n\r\n", &out);
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));
}

TEST(ServerRequestParsingTest, AmbiguousTransferEncodingClosesConnection) {
  // RFC 9112 §6.1
  const char *requests[] = {
      "PUT /put_hi HTTP/1.1\r\n"
      "Host: localhost\r\n"
      "Content-Length: 0\r\n"
      "Transfer-Encoding: chunked\r\n"
      "\r\n"
      "0\r\n\r\n",
      "PUT /put_hi HTTP/1.0\r\n"
      "Connection: keep-alive\r\n"
      "Transfer-Encoding: chunked\r\n"
      "\r\n"
      "0\r\n\r\n",
  };

  for (auto request : requests) {
    std::string out;
    test_raw_request(request, &out);
    EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15)) << request;
    EXPECT_NE(std::string::npos, out.find("Connection: close")) << request;
  }
}

TEST(ServerRequestParsingTest, InvalidFirstChunkLengthInRequest) {
  std::string out;

  test_raw_request("PUT /put_hi HTTP/1.1\r\n"
                   "Content-Type: text/plain\r\n"
                   "Transfer-Encoding: chunked\r\n"
                   "\r\n"
                   "nothex\r\n",
                   &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, InvalidSecondChunkLengthInRequest) {
  std::string out;

  test_raw_request("PUT /put_hi HTTP/1.1\r\n"
                   "Content-Type: text/plain\r\n"
                   "Transfer-Encoding: chunked\r\n"
                   "\r\n"
                   "3\r\n"
                   "xyz\r\n"
                   "NaN\r\n",
                   &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, ChunkLengthTooHighInRequest) {
  std::string out;

  test_raw_request("PUT /put_hi HTTP/1.1\r\n"
                   "Content-Type: text/plain\r\n"
                   "Transfer-Encoding: chunked\r\n"
                   "\r\n"
                   // Length is too large for 64 bits.
                   "1ffffffffffffffff\r\n"
                   "xyz\r\n",
                   &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, InvalidHeaderTextWithExtraCR) {
  test_raw_request("GET /hi HTTP/1.1\r\n"
                   "Content-Type: text/plain\r\n\r");
}

TEST(ServerRequestParsingTest, InvalidSpaceInURL) {
  std::string out;
  test_raw_request("GET /h i HTTP/1.1\r\n\r\n", &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, InvalidControlCharInURL) {
  for (auto target : {"/h\ri", "/h\x7fi"}) {
    std::string out;
    test_raw_request(std::string("GET ") + target + " HTTP/1.1\r\n\r\n", &out);
    EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24)) << target;
  }
}

TEST(ServerRequestParsingTest, NonAsciiInURLAccepted) {
  std::string out;
  test_raw_request("GET /hi?q=\xE3\x81\x82 HTTP/1.1\r\n"
                   "Host: localhost\r\n"
                   "Connection: close\r\n\r\n",
                   &out);
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));
}

TEST(ServerRequestParsingTest, RemoteAddrSetOnBadRequest) {
  Server svr;

  svr.set_error_handler([&](const Request &req, Response & /*res*/) {
    EXPECT_TRUE(!req.remote_addr.empty());
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Send an invalid request line to trigger Bad Request
  const std::string bad_req = "BADMETHOD / HTTP/1.1\r\nHost: localhost\r\n\r\n";
  std::string out;
  ASSERT_TRUE(send_request(5, bad_req, &out));
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

// A custom method with neither Content-Length nor Transfer-Encoding must be
// answered right away rather than blocking on a read that waits for EOF.
TEST(ServerRequestParsingTest, CustomMethodWithoutFraming) {
  std::string out;
  test_raw_request("PROPFIND /dav HTTP/1.1\r\nHost: localhost\r\n\r\n", &out);
  EXPECT_EQ("HTTP/1.1 207 Multi-Status", out.substr(0, 25));
}

TEST(CustomRouteRegistrationTest, RejectsBuiltInMethods) {
  const char *methods[] = {"GET",     "HEAD",    "POST",  "PUT",   "DELETE",
                           "CONNECT", "OPTIONS", "TRACE", "PATCH", "PRI"};

  for (const auto *method : methods) {
    Server svr;
    svr.CustomRoute(method, "/x", [](const Request &, Response &) {});

    EXPECT_FALSE(svr.is_valid()) << method;
    EXPECT_FALSE(svr.listen(HOST, PORT)) << method;
  }
}

TEST(CustomRouteRegistrationTest, RejectsNonTokenMethods) {
  const char *methods[] = {"",          "PRO PFIND", "PROP\tFIND", "PROP/FIND",
                           "PROP,FIND", "PROP:FIND", "PROP(FIND)", "\x01FIND"};

  for (const auto *method : methods) {
    Server svr;
    svr.CustomRoute(method, "/x", [](const Request &, Response &) {});

    EXPECT_FALSE(svr.is_valid()) << method;
  }
}

TEST(CustomRouteRegistrationTest, AcceptsWebDavAndUpnpMethods) {
  const char *methods[] = {"PROPFIND", "PROPPATCH", "MKCOL",
                           "COPY",     "MOVE",      "LOCK",
                           "UNLOCK",   "REPORT",    "SUBSCRIBE"};

  Server svr;
  for (const auto *method : methods) {
    svr.CustomRoute(method, "/x", [](const Request &, Response &) {});
  }

  EXPECT_TRUE(svr.is_valid());
}

TEST(CustomRouteRegistrationTest, ContentReaderOverloadRejectsBuiltInMethods) {
  Server svr;
  svr.CustomRoute("POST", "/x",
                  [](const Request &, Response &, const ContentReader &) {});

  EXPECT_FALSE(svr.is_valid());
}

TEST(CustomRouteRegistrationTest, RejectionIsSticky) {
  Server svr;
  svr.CustomRoute("PROPFIND", "/a", [](const Request &, Response &) {});
  svr.CustomRoute("GET", "/b", [](const Request &, Response &) {});
  svr.CustomRoute("MKCOL", "/c", [](const Request &, Response &) {});

  EXPECT_FALSE(svr.is_valid());
}

TEST(CustomRouteRegistrationTest, ReportsRejectionToErrorLogger) {
  Server svr;

  auto captured = Error::Success;
  svr.set_error_logger(
      [&](const Error &err, const Request * /*req*/) { captured = err; });

  svr.CustomRoute("POST", "/x", [](const Request &, Response &) {});

  EXPECT_EQ(Error::InvalidHTTPMethod, captured);
}

TEST(ServerRequestParsingTest, InvalidFieldValueContains_CR_LF_NUL) {
  std::string out;
  std::string request(
      "GET /header_field_value_check HTTP/1.1\r\nTest: [\r\x00\n]\r\n\r\n", 55);
  test_raw_request(request, &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, InvalidFieldValueContains_LF) {
  std::string out;
  std::string request(
      "GET /header_field_value_check HTTP/1.1\r\nTest: [\n\n\n]\r\n\r\n", 55);
  test_raw_request(request, &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, InvalidFieldNameContains_PreceedingSpaces) {
  std::string out;
  std::string request(
      "GET /header_field_value_check HTTP/1.1\r\n  Test: val\r\n\r\n", 55);
  test_raw_request(request, &out);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", out.substr(0, 24));
}

TEST(ServerRequestParsingTest, EmptyFieldValue) {
  std::string out;

  test_raw_request("GET /header_field_value_check HTTP/1.1\r\n"
                   "Host: localhost\r\n"
                   "Test: \r\n\r\n",
                   &out);
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));
}

TEST(ServerRequestParsingTest, HeaderValueNotPercentDecoded) {
  Server svr;
  std::string x_custom;
  std::string cookie;
  std::string xff;
  std::string x_unicode;
  std::string x_iis;

  svr.Get("/check", [&](const Request &req, Response &res) {
    x_custom = req.get_header_value("X-Custom");
    cookie = req.get_header_value("Cookie");
    xff = req.get_header_value("X-Forwarded-For");
    x_unicode = req.get_header_value("X-Unicode");
    x_iis = req.get_header_value("X-IIS");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = "GET /check HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "X-Custom: a%0D%0AInjected: b\r\n"
                          "Cookie: session%3Dvictim%3B%20admin%3Dyes\r\n"
                          "X-Forwarded-For: 1.2.3.4%2C5.6.7.8\r\n"
                          "X-Unicode: %E3%81%82\r\n"
                          "X-IIS: %u00E9\r\n"
                          "Connection: close\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res));
  EXPECT_EQ("HTTP/1.1 200 OK", res.substr(0, 15));

  // Every value must be returned verbatim (wire form), with no decoding.
  EXPECT_EQ("a%0D%0AInjected: b", x_custom);
  EXPECT_EQ("session%3Dvictim%3B%20admin%3Dyes", cookie);
  EXPECT_EQ("1.2.3.4%2C5.6.7.8", xff);
  EXPECT_EQ("%E3%81%82", x_unicode);
  EXPECT_EQ("%u00E9", x_iis);
}

// Applications that previously relied on automatic percent-decoding can
// reproduce the old behavior by explicitly calling decode_path_component()
// or, for RFC 3986 conformance, decode_uri_component().
TEST(ServerRequestParsingTest, HeaderValueExplicitDecodingByApplication) {
  Server svr;
  std::string decoded;

  svr.Get("/check", [&](const Request &req, Response &res) {
    decoded = decode_uri_component(req.get_header_value("X-Custom"));
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = "GET /check HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "X-Custom: hello%20world\r\n"
                          "Connection: close\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res));
  EXPECT_EQ("HTTP/1.1 200 OK", res.substr(0, 15));
  EXPECT_EQ("hello world", decoded);
}

// Regression test for #2033. Browsers send Referer values that include
// percent-encoded characters such as %0A inside the URL. Decoding the
// header value would either trip the post-decode CR/LF/NUL guard (the
// original bug, returning 400) or, after that guard was relaxed, silently
// store a literal LF — both unacceptable. The wire form must round-trip.
TEST(ServerRequestParsingTest, RefererWithPercentEncodedNewline) {
  Server svr;
  std::string referer;

  svr.Get("/check", [&](const Request &req, Response &res) {
    referer = req.get_header_value("Referer");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = "GET /check HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "Referer: http://localhost:1111/?q=Hello%0A\r\n"
                          "Connection: close\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(5, req, &res));
  EXPECT_EQ("HTTP/1.1 200 OK", res.substr(0, 15));
  EXPECT_EQ("http://localhost:1111/?q=Hello%0A", referer);
}

TEST(ServerStopTest, StopServerWithChunkedTransmission) {
  Server svr;

  svr.Get("/events", [](const Request & /*req*/, Response &res) {
    res.set_header("Cache-Control", "no-cache");
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          std::string s = "data:";
          s += std::to_string(offset);
          s += "\n\n";
          auto ret = sink.write(s.data(), s.size());
          EXPECT_TRUE(ret);
          std::this_thread::sleep_for(std::chrono::seconds(1));
          return true;
        });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  svr.wait_until_ready();

  Client client(HOST, PORT);
  const Headers headers = {{"Accept", "text/event-stream"}};

  auto get_thread = std::thread([&client, &headers]() {
    auto res = client.Get(
        "/events", headers,
        [](const char * /*data*/, size_t /*len*/) -> bool { return true; });
  });
  auto se = detail::scope_exit([&] {
    svr.stop();
    get_thread.join();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  // Give GET time to get a few messages.
  std::this_thread::sleep_for(std::chrono::seconds(2));
}

TEST(ServerStopTest, ClientAccessAfterServerDown) {
  httplib::Server svr;
  svr.Post("/hi",
           [&](const httplib::Request & /*req*/, httplib::Response &res) {
             res.status = StatusCode::OK_200;
           });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  auto res = cli.Post("/hi", "data", "text/plain");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  svr.stop();
  thread.join();
  ASSERT_FALSE(svr.is_running());

  res = cli.Post("/hi", "data", "text/plain");
  ASSERT_FALSE(res);
}

TEST(ServerStopTest, ListenFailure) {
  Server svr;
  auto t = thread([&]() {
    auto ret = svr.listen("????", PORT);
    EXPECT_FALSE(ret);
  });
  svr.wait_until_ready();
  svr.stop();
  t.join();
}

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
TEST(ServerStopTest, Decommision) {
  Server svr;

  svr.Get("/hi", [&](const Request &, Response &res) { res.body = "hi..."; });

  for (int i = 0; i < 4; i++) {
    auto is_even = !(i % 2);

    std::thread t{[&] {
      try {
        std::this_thread::sleep_for(std::chrono::milliseconds(100));

        if (is_even) {
          throw std::runtime_error("Some thing that happens to go wrong.");
        }

        svr.listen(HOST, PORT);
      } catch (...) { svr.decommission(); }
    }};

    svr.wait_until_ready();

    // Server is up
    {
      Client cli(HOST, PORT);
      auto res = cli.Get("/hi");
      if (is_even) {
        EXPECT_FALSE(res);
      } else {
        EXPECT_TRUE(res);
        EXPECT_EQ("hi...", res->body);
      }
    }

    svr.stop();
    t.join();

    // Server is down...
    {
      Client cli(HOST, PORT);
      auto res = cli.Get("/hi");
      EXPECT_FALSE(res);
    }
  }
}
#endif

// Helper function for string body upload progress tests
template <typename SetupHandler, typename ClientCall>
void TestStringBodyUploadProgress(SetupHandler &&setup_handler,
                                  ClientCall &&client_call,
                                  const string &body) {
  Server svr;
  setup_handler(svr);

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  vector<uint64_t> progress_values;
  bool progress_called = false;

  auto res =
      client_call(cli, body, [&](uint64_t current, uint64_t /*total*/) -> bool {
        progress_values.push_back(current);
        progress_called = true;
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_TRUE(progress_called);
}

TEST(UploadProgressTest, PostStringBodyBasic) {
  TestStringBodyUploadProgress(
      [](Server &svr) {
        svr.Post("/test", [](const Request & /*req*/, Response &res) {
          res.set_content("received", "text/plain");
        });
      },
      [](Client &cli, const string &body, UploadProgress progress_callback) {
        return cli.Post("/test", body, "text/plain", progress_callback);
      },
      "test data for upload progress");
}

TEST(UploadProgressTest, PutStringBodyBasic) {
  TestStringBodyUploadProgress(
      [](Server &svr) {
        svr.Put("/test", [](const Request & /*req*/, Response &res) {
          res.set_content("put received", "text/plain");
        });
      },
      [](Client &cli, const string &body, UploadProgress progress_callback) {
        return cli.Put("/test", body, "text/plain", progress_callback);
      },
      "put test data for upload progress");
}

TEST(UploadProgressTest, PatchStringBodyBasic) {
  TestStringBodyUploadProgress(
      [](Server &svr) {
        svr.Patch("/test", [](const Request & /*req*/, Response &res) {
          res.set_content("patch received", "text/plain");
        });
      },
      [](Client &cli, const string &body, UploadProgress progress_callback) {
        return cli.Patch("/test", body, "text/plain", progress_callback);
      },
      "patch test data for upload progress");
}

// Helper function for content provider upload progress tests
template <typename SetupHandler, typename ClientCall>
void TestContentProviderUploadProgress(SetupHandler &&setup_handler,
                                       ClientCall &&client_call) {
  Server svr;
  setup_handler(svr);

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, PORT);
  vector<uint64_t> progress_values;

  auto res =
      client_call(cli, [&](uint64_t current, uint64_t /*total*/) -> bool {
        progress_values.push_back(current);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_FALSE(progress_values.empty());
}

TEST(UploadProgressTest, PostContentProviderProgress) {
  TestContentProviderUploadProgress(
      [](Server &svr) {
        svr.Post("/test", [](const Request & /*req*/, Response &res) {
          res.set_content("provider received", "text/plain");
        });
      },
      [](Client &cli, UploadProgress progress_callback) {
        return cli.Post(
            "/test", 9,
            [](size_t /*offset*/, size_t /*length*/, DataSink &sink) -> bool {
              sink.os << "test data";
              return true;
            },
            "text/plain", progress_callback);
      });
}

// Helper function for multipart upload progress tests
template <typename SetupHandler, typename ClientCall>
void TestMultipartUploadProgress(SetupHandler &&setup_handler,
                                 ClientCall &&client_call,
                                 const string &endpoint) {
  Server svr;
  setup_handler(svr);

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, PORT);
  vector<uint64_t> progress_values;

  UploadFormDataItems items = {
      {"field1", "value1", "", ""},
      {"field2", "longer value for progress tracking test", "", ""},
      {"file1", "file content data for upload progress", "test.txt",
       "text/plain"}};

  auto res = client_call(cli, endpoint, items,
                         [&](uint64_t current, uint64_t /*total*/) -> bool {
                           progress_values.push_back(current);
                           return true;
                         });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_FALSE(progress_values.empty());
}

TEST(UploadProgressTest, PostMultipartProgress) {
  TestMultipartUploadProgress(
      [](Server &svr) {
        svr.Post("/multipart", [](const Request &req, Response &res) {
          EXPECT_TRUE(!req.form.files.empty() || !req.form.fields.empty());
          res.set_content("multipart received", "text/plain");
        });
      },
      [](Client &cli, const string &endpoint, const UploadFormDataItems &items,
         UploadProgress progress_callback) {
        return cli.Post(endpoint, items, progress_callback);
      },
      "/multipart");
}

// Helper function for basic download progress tests
template <typename SetupHandler, typename ClientCall>
void TestBasicDownloadProgress(SetupHandler &&setup_handler,
                               ClientCall &&client_call, const string &endpoint,
                               size_t expected_content_size) {
  Server svr;
  setup_handler(svr);

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, PORT);
  vector<uint64_t> progress_values;

  auto res = client_call(cli, endpoint,
                         [&](uint64_t current, uint64_t /*total*/) -> bool {
                           progress_values.push_back(current);
                           return true;
                         });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_FALSE(progress_values.empty());
  EXPECT_EQ(expected_content_size, res->body.size());
}

TEST(DownloadProgressTest, GetBasic) {
  TestBasicDownloadProgress(
      [](Server &svr) {
        svr.Get("/download", [](const Request & /*req*/, Response &res) {
          string content(1000, 'D');
          res.set_content(content, "text/plain");
        });
      },
      [](Client &cli, const string &endpoint,
         DownloadProgress progress_callback) {
        return cli.Get(endpoint, progress_callback);
      },
      "/download", 1000u);
}

// Helper function for content receiver download progress tests
template <typename SetupHandler, typename ClientCall>
void TestContentReceiverDownloadProgress(SetupHandler &&setup_handler,
                                         ClientCall &&client_call,
                                         const string &endpoint,
                                         size_t expected_content_size) {
  Server svr;
  setup_handler(svr);

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, PORT);
  vector<uint64_t> progress_values;
  string received_body;

  auto res = client_call(
      cli, endpoint,
      [&](const char *data, size_t data_length) -> bool {
        received_body.append(data, data_length);
        return true;
      },
      [&](uint64_t current, uint64_t /*total*/) -> bool {
        progress_values.push_back(current);
        return true;
      });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_FALSE(progress_values.empty());
  EXPECT_EQ(expected_content_size, received_body.size());
  EXPECT_TRUE(res->body.empty());
}

TEST(DownloadProgressTest, GetWithContentReceiver) {
  TestContentReceiverDownloadProgress(
      [](Server &svr) {
        svr.Get("/download-receiver",
                [](const Request & /*req*/, Response &res) {
                  string content(2000, 'R');
                  res.set_content(content, "text/plain");
                });
      },
      [](Client &cli, const string &endpoint, ContentReceiver content_receiver,
         DownloadProgress progress_callback) {
        return cli.Get(endpoint, content_receiver, progress_callback);
      },
      "/download-receiver", 2000u);
}

TEST(StreamingTest, ChunkedZeroLengthWriteDoesNotEndTheBody) {
  // A provider reaching a pass with nothing to hand over - an empty buffer
  // popped off a queue, say - must not be taken to mean the body is finished.
  // It used to end the loop with the terminating chunk unwritten while the
  // server still considered the response complete, so the peer waited for an
  // end that never arrived.
  Server svr;

  svr.Get("/stream", [](const Request & /*req*/, Response &res) {
    auto step = std::make_shared<int>(0);
    res.set_chunked_content_provider("text/plain",
                                     [step](size_t /*offset*/, DataSink &sink) {
                                       switch ((*step)++) {
                                       case 0: sink.write("", 0); break;
                                       case 1: sink.write("hello", 5); break;
                                       default: sink.done(); break;
                                       }
                                       return true;
                                     });
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto listen_se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  // Without the fix the body is never terminated, so bound the wait rather
  // than letting the test hang on the default read timeout.
  cli.set_read_timeout(5, 0);

  auto res = cli.Get("/stream");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("hello", res->body);
}

TEST(StreamingTest, NoContentLengthStreaming) {
  Server svr;

  svr.Get("/stream", [](const Request & /*req*/, Response &res) {
    res.set_content_provider("text/plain", [](size_t offset, DataSink &sink) {
      if (offset < 6) {
        sink.os << (offset < 3 ? "a" : "b");
      } else {
        sink.done();
      }
      return true;
    });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto listen_se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client client(HOST, PORT);

  auto get_thread = std::thread([&client]() {
    std::string s;
    auto res =
        client.Get("/stream", [&s](const char *data, size_t len) -> bool {
          s += std::string(data, len);
          return true;
        });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("aaabbb", s);
  });
  auto get_se = detail::scope_exit([&] { get_thread.join(); });

  // Give GET time to get a few messages.
  std::this_thread::sleep_for(std::chrono::milliseconds(500));
}

TEST(MountTest, Unmount) {
  Server svr;

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  svr.set_mount_point("/mount2", "./www2");

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);

  res = cli.Get("/mount2/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  svr.set_mount_point("/", "./www");

  res = cli.Get("/dir/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  svr.remove_mount_point("/");
  res = cli.Get("/dir/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);

  svr.remove_mount_point("/mount2");
  res = cli.Get("/mount2/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST(MountTest, MissingFileFallsThroughToHandlers) {
  Server svr;
  ASSERT_TRUE(svr.set_mount_point("/", "./www"));
  svr.Get("/api/hello", [](const Request &, Response &res) {
    res.set_content("api", "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get("/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  res = cli.Get("/api/hello");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("api", res->body);
}

TEST(MountTest, PathSegmentBoundary) {
  Server svr;

  svr.set_mount_point("/mount2", "./www2");
  svr.set_mount_point("/", "./www");

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  auto res = cli.Get("/mount2/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  // "/mount2" must not match part-way through a path segment.
  res = cli.Get("/mount2dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);

  // A mount point ending in '/' keeps matching every path below it.
  res = cli.Get("/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MountTest, Redicect) {
  Server svr;

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.set_mount_point("/", "./www");
  svr.wait_until_ready();

  Client cli("localhost", PORT);

  auto res = cli.Get("/dir/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  res = cli.Get("/dir");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);

  res = cli.Get("/file");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  res = cli.Get("/file/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);

  cli.set_follow_location(true);
  res = cli.Get("/dir");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MountTest, MultibytesPathName) {
  Server svr;

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.set_mount_point("/", "./www");
  svr.wait_until_ready();

  Client cli("localhost", PORT);

  auto res = cli.Get(U8("/日本語Dir/日本語File.txt"));
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(U8("日本語コンテンツ"), res->body);
}

// A mount point serves no path with an empty segment or one ending in '.' or
// a space, so a guard in the pre-routing handler sees the path of every file
// that is served
TEST(MountTest, AliasedPathDoesNotPassPreRoutingGuard) {
  Server svr;
  ASSERT_TRUE(svr.set_mount_point("/", "./www"));
  svr.set_pre_routing_handler([](const Request &req, Response &res) {
    if (req.path == "/dir/test.html") {
      res.status = StatusCode::Unauthorized_401;
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_LT(0, port);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  for (auto path :
       {"/./dir/test.html", "/dir/./test.html", "//dir/test.html",
        "/dir//test.html", "/dir/../dir/test.html", "/%2e/dir/test.html",
        "/dir/test.html.", "/dir/test.html%20", "/dir/test.html::$DATA",
        "/dir/test.html%3A%3A$DATA"}) {
    SCOPED_TRACE(path);
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::NotFound_404, res->status);
  }
}

TEST(UserDefinedMIMETypeMappingTest, IgnoresCaseAndLeadingDot) {
  Server svr;
  svr.set_mount_point("/", "./www");
  svr.set_file_extension_and_mimetype_mapping(".abcde", "text/abcde");
  svr.set_file_extension_and_mimetype_mapping("HTML", "text/x-html");

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get("/dir/test.abcde");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("text/abcde", res->get_header_value("Content-Type"));

  res = cli.Get("/dir/test.html");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("text/x-html", res->get_header_value("Content-Type"));
}

#ifdef _WIN32
// Issue #2435: mmap::open() must succeed even when another handle holds
// the file open for writing (e.g. an active log file).
TEST(MmapTest, OpenWhileFileHeldForWriting) {
  const char *path = "mmap_concurrent_writer_test.txt";
  const char *content = "hello";

  {
    std::ofstream f(path, std::ios::binary);
    f.write(content, static_cast<std::streamsize>(strlen(content)));
  }
  auto file_cleanup = detail::scope_exit([&] { std::remove(path); });

  HANDLE writer = ::CreateFileA(path, GENERIC_WRITE, FILE_SHARE_READ, NULL,
                                OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  ASSERT_NE(INVALID_HANDLE_VALUE, writer);
  auto handle_cleanup = detail::scope_exit([&] { ::CloseHandle(writer); });

  detail::mmap m(path);
  ASSERT_TRUE(m.is_open());
  EXPECT_EQ(strlen(content), m.size());
  char buf[8];
  ASSERT_EQ(strlen(content), m.read(0, buf, sizeof(buf)));
  EXPECT_EQ(0, std::memcmp(content, buf, strlen(content)));
}
#endif

#ifndef _WIN32
// A directory or a device has no size to serve.
TEST(MmapTest, OnlyRegularFilesAreOpened) {
  const char *path = "./mmap_not_regular_test_dir";
  ASSERT_EQ(0, ::mkdir(path, 0755));
  auto dir_cleanup = detail::scope_exit([&] { ::rmdir(path); });

  for (auto p : {path, "/dev/null"}) {
    detail::mmap m(p);
    EXPECT_FALSE(m.is_open()) << p;
    EXPECT_EQ(0U, m.size()) << p;
  }

  Server svr;
  svr.Get("/null", [](const Request & /*req*/, Response &res) {
    res.set_file_content("/dev/null");
  });
  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto res = Client(HOST, port).Get("/null");
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}
#endif

#ifdef __linux__
// Nothing of the file stays mapped, where a truncation would raise SIGBUS.
TEST(MmapTest, FileIsNotMapped) {
  const char *path = "mmap_not_mapped_test.txt";
  {
    std::ofstream f(path, std::ios::binary);
    f << "hello";
  }
  auto file_cleanup = detail::scope_exit([&] { std::remove(path); });

  detail::mmap m(path);
  ASSERT_TRUE(m.is_open());

  std::ifstream maps("/proc/self/maps");
  std::string mappings((std::istreambuf_iterator<char>(maps)),
                       std::istreambuf_iterator<char>());
  EXPECT_EQ(std::string::npos, mappings.find(path));
}
#endif

TEST(KeepAliveTest, ReadTimeout) {
  Server svr;

  svr.Get("/a", [&](const Request & /*req*/, Response &res) {
    std::this_thread::sleep_for(std::chrono::seconds(2));
    res.set_content("a", "text/plain");
  });

  svr.Get("/b", [&](const Request & /*req*/, Response &res) {
    res.set_content("b", "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);
  cli.set_keep_alive(true);
  cli.set_read_timeout(std::chrono::seconds(1));

  auto resa = cli.Get("/a");
  ASSERT_FALSE(resa);
  EXPECT_EQ(Error::Read, resa.error());

  auto resb = cli.Get("/b");
  ASSERT_TRUE(resb);
  EXPECT_EQ(StatusCode::OK_200, resb->status);
  EXPECT_EQ("b", resb->body);
}

TEST(KeepAliveTest, MaxCount) {
  size_t keep_alive_max_count = 3;

  Server svr;
  svr.set_keep_alive_max_count(keep_alive_max_count);

  svr.Get("/hi", [](const httplib::Request &, httplib::Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_keep_alive(true);

  for (size_t i = 0; i < 5; i++) {
    auto result = cli.Get("/hi");
    ASSERT_TRUE(result);
    EXPECT_EQ(StatusCode::OK_200, result->status);

    if (i == keep_alive_max_count - 1) {
      EXPECT_EQ("close", result->get_header_value("Connection"));
    } else {
      EXPECT_FALSE(result->has_header("Connection"));
    }
  }
}

// A client may pipeline its requests (RFC 9112 9.3.2), so reading one request
// can pull the next one into the server's buffer. The server must serve it
// without waiting for the socket to become readable again. The keep-alive
// timeout outlasts the client's read timeout, so a request left waiting for it
// shows up as a missing response.
static void serve_pipelining_routes(Server &svr,
                                    const std::function<void(int)> &client) {
  svr.set_keep_alive_timeout(5);
  svr.Get("/hi/(\\d+)", [](const Request &req, Response &res) {
    res.set_content("hi " + req.matches[1].str(), "text/plain");
  });
  svr.Post("/echo", [](const Request &req, Response &res) {
    res.set_content("echo " + req.body, "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  client(port);
}

static std::string
send_pipelined_requests(const std::vector<std::string> &parts) {
  Server svr;
  std::string res;
  serve_pipelining_routes(svr, [&](int port) {
    EXPECT_TRUE(send_request_in_parts(2, parts, &res, port));
  });
  return res;
}

static void expect_in_order(const std::string &res,
                            const std::vector<std::string> &bodies) {
  size_t pos = 0;
  for (const auto &body : bodies) {
    pos = res.find(body, pos);
    ASSERT_NE(std::string::npos, pos) << "missing or out of order: " << body;
    pos += body.size();
  }
}

TEST(KeepAliveTest, PipelinedRequests) {
  auto res = send_pipelined_requests(
      {"GET /hi/1 HTTP/1.1\r\nHost: localhost\r\n\r\n"
       "POST /echo HTTP/1.1\r\nHost: localhost\r\n"
       "Content-Length: 4\r\n\r\nbody"
       "GET /hi/3 HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n"});
  expect_in_order(res, {"hi 1", "echo body", "hi 3"});
}

// The second request starts in the server's buffer and ends on the socket.
TEST(KeepAliveTest, PipelinedRequestSplitAcrossReads) {
  auto res =
      send_pipelined_requests({"GET /hi/1 HTTP/1.1\r\nHost: localhost\r\n\r\n"
                               "GET /hi/2 HTTP/1.1\r\nHo",
                               "st: localhost\r\nConnection: close\r\n\r\n"});
  expect_in_order(res, {"hi 1", "hi 2"});
}

// RFC 9112 2.2: an empty line before the request-line is ignored, so an extra
// CRLF after a body does not turn into a 400 for the next request.
TEST(KeepAliveTest, EmptyLineBeforeRequestLineIsIgnored) {
  auto res = send_pipelined_requests(
      {"POST /echo HTTP/1.1\r\nHost: localhost\r\n"
       "Content-Length: 4\r\n\r\nbody\r\n"
       "GET /hi/2 HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n"});
  EXPECT_EQ(std::string::npos, res.find("400 Bad Request"));
  expect_in_order(res, {"echo body", "hi 2"});
}

// Where an unparsable request ends is unknown, so what follows it in the buffer
// must not be served as the next request.
TEST(KeepAliveTest, PipelinedRequestAfterInvalidRequestIsNotServed) {
  auto res = send_pipelined_requests(
      {"INVALID REQUEST LINE\r\n\r\n"
       "GET /hi/1 HTTP/1.1\r\nHost: localhost\r\n\r\n"});
  EXPECT_EQ("HTTP/1.1 400 Bad Request", res.substr(0, 24));
  EXPECT_EQ(std::string::npos, res.find("hi 1"));
}

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
// Over TLS, the next request is held by the TLS library as already decrypted
// data rather than on the socket.
TEST(KeepAliveTest, SSLPipelinedRequests) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  std::string res;
  serve_pipelining_routes(svr, [&](int port) {
    // One part, so all three requests arrive in one TLS record
    EXPECT_TRUE(send_ssl_request_in_parts(
        2,
        {"GET /hi/1 HTTP/1.1\r\nHost: localhost\r\n\r\n"
         "GET /hi/2 HTTP/1.1\r\nHost: localhost\r\n\r\n"
         "GET /hi/3 HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n"},
        &res, port));
  });
  expect_in_order(res, {"hi 1", "hi 2", "hi 3"});
}
#endif

TEST(KeepAliveTest, Issue1041) {
  Server svr;
  svr.set_keep_alive_timeout(3);

  svr.Get("/hi", [](const httplib::Request &, httplib::Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_keep_alive(true);

  auto result = cli.Get("/hi");
  ASSERT_TRUE(result);
  EXPECT_EQ(StatusCode::OK_200, result->status);

  std::this_thread::sleep_for(std::chrono::seconds(5));

  result = cli.Get("/hi");
  ASSERT_TRUE(result);
  EXPECT_EQ(StatusCode::OK_200, result->status);
}

TEST(KeepAliveTest, MaxCountZeroSetsNoLimit) {
  Server svr;
  svr.set_keep_alive_max_count(0);
  std::set<int> remote_ports;
  svr.Get("/hi", [&](const Request &req, Response &res) {
    remote_ports.insert(req.remote_port);
    res.set_content("hi", "text/plain");
  });

  auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_keep_alive(true);
  for (int i = 0; i < 3; i++) {
    auto res = cli.Get("/hi");
    ASSERT_TRUE(res);
    EXPECT_EQ("timeout=5", res->get_header_value("Keep-Alive"));
  }
  // All three over one connection
  EXPECT_EQ(1u, remote_ports.size());
}

TEST(KeepAliveTest, Issue1959) {
  Server svr;
  svr.set_keep_alive_timeout(5);

  svr.Get("/a", [&](const Request & /*req*/, Response &res) {
    res.set_content("a", "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    if (!svr.is_running()) return;
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);
  cli.set_keep_alive(true);

  using namespace std::chrono;
  auto start = steady_clock::now();

  cli.Get("/a");

  svr.stop();
  listen_thread.join();

  auto end = steady_clock::now();
  auto elapsed = duration_cast<milliseconds>(end - start).count();

  EXPECT_LT(elapsed, 5000);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(KeepAliveTest, SSLClientReconnection) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.set_keep_alive_timeout(1);

  svr.Get("/hi", [](const httplib::Request &, httplib::Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_keep_alive(true);

  auto result = cli.Get("/hi");
  ASSERT_TRUE(result);
  EXPECT_EQ(StatusCode::OK_200, result->status);

  result = cli.Get("/hi");
  ASSERT_TRUE(result);
  EXPECT_EQ(StatusCode::OK_200, result->status);

  std::this_thread::sleep_for(std::chrono::seconds(2));

  // Recoonect
  result = cli.Get("/hi");
  ASSERT_TRUE(result);
  EXPECT_EQ(StatusCode::OK_200, result->status);

  result = cli.Get("/hi");
  ASSERT_TRUE(result);
  EXPECT_EQ(StatusCode::OK_200, result->status);
}

TEST(KeepAliveTest, SSLClientReconnectionPost) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.set_keep_alive_timeout(1);
  std::string content = "reconnect";

  svr.Post("/hi", [](const httplib::Request &, httplib::Response &res) {
    res.set_content("Hello World!", "text/plain");
  });

  auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_keep_alive(true);

  auto result = cli.Post(
      "/hi", content.size(),
      [&content](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.write(content.c_str(), content.size());
        return true;
      },
      "text/plain");
  ASSERT_TRUE(result);
  EXPECT_EQ(200, result->status);

  std::this_thread::sleep_for(std::chrono::seconds(2));

  // Recoonect
  result = cli.Post(
      "/hi", content.size(),
      [&content](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.write(content.c_str(), content.size());
        return true;
      },
      "text/plain");
  ASSERT_TRUE(result);
  EXPECT_EQ(200, result->status);

  result = cli.Post(
      "/hi", content.size(),
      [&content](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.write(content.c_str(), content.size());
        return true;
      },
      "text/plain");
  ASSERT_TRUE(result);
  EXPECT_EQ(200, result->status);
}

TEST(SNI_AutoDetectionTest, SNI_Logic) {
  using namespace httplib::tls;

  {
    SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
    ASSERT_TRUE(svr.is_valid());

    svr.Get("/sni", [&](const Request &req, Response &res) {
      std::string expected = req.sni();
      EXPECT_EQ(expected, req.get_param_value("expected"));
      res.set_content("ok", "text/plain");
    });

    auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
    auto se = detail::scope_exit([&] {
      svr.stop();
      listen_thread.join();
      ASSERT_FALSE(svr.is_running());
    });

    svr.wait_until_ready();

    {
      SSLClient cli("localhost", PORT);
      cli.enable_server_certificate_verification(false);
      auto res = cli.Get("/sni?expected=localhost");
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    }

    {
      SSLClient cli("::1", PORT);
      cli.enable_server_certificate_verification(false);
      auto res = cli.Get("/sni?expected=");

      // NOTE: This may fail if the server is listening on IPv4 only
      // (e.g., when localhost resolves to 127.0.0.1 only)
      if (res) {
        EXPECT_EQ(StatusCode::OK_200, res->status);
      } else {
        EXPECT_EQ(Error::Connection, res.error());
      }
    }
  }
}

// The SNI of a failed handshake does not reach the next connection that the
// same worker thread serves
TEST(SNI_AutoDetectionTest, FailedHandshakeLeavesNoSNI) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.new_task_queue = [] { return new ThreadPool(1); };
  svr.Get("/sni", [](const Request &req, Response &res) {
    res.set_content(req.sni(), "text/plain");
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  ASSERT_LT(0, port);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  {
    // Sends SNI, then rejects the server certificate, which the CA did not sign
    SSLClient cli("localhost", port);
    cli.set_hostname_addr_map({{"localhost", "127.0.0.1"}});
    cli.set_ca_cert_path(CLIENT_CA_CERT_FILE);
    auto res = cli.Get("/sni");
    ASSERT_FALSE(res);
    EXPECT_EQ(Error::SSLServerVerification, res.error());
  }

  // An IP host sends no SNI (RFC 6066)
  SSLClient cli("127.0.0.1", port);
  cli.enable_server_certificate_verification(false);
  auto res = cli.Get("/sni");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("", res->body);
}
#endif

TEST(ClientProblemDetectionTest, ContentProvider) {
  Server svr;

  size_t content_length = 1024 * 1024;

  svr.Get("/hi", [&](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        content_length, "text/plain",
        [&](size_t offset, size_t length, DataSink &sink) {
          auto out_len = std::min(length, static_cast<size_t>(1024));
          std::string out(out_len, '@');
          sink.write(out.data(), out_len);
          return offset < 4096;
        },
        [](bool success) { ASSERT_FALSE(success); });
  });

  svr.Get("/empty", [&](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        0, "text/plain",
        [&](size_t /*offset*/, size_t /*length*/, DataSink & /*sink*/) -> bool {
          EXPECT_TRUE(false);
          return true;
        },
        [](bool success) { ASSERT_FALSE(success); });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  {
    auto res = cli.Get("/hi", [&](const char * /*data*/,
                                  size_t /*data_length*/) { return false; });
    ASSERT_FALSE(res);
  }

  {
    auto res = cli.Get("/empty", [&](const char * /*data*/,
                                     size_t /*data_length*/) { return false; });
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  }
}

TEST(ContentProviderTest, ProviderMakingNoProgressFails) {
  // A provider that reports success without writing anything and without
  // calling done() used to be handed the same offset and length again on every
  // pass, so it spun for as long as the peer stayed connected.
  Server svr;

  svr.Post("/", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  std::atomic<int> call_count{0};

  Client cli(HOST, port);
  auto res = cli.Post(
      "/", 1024,
      [&](size_t /*offset*/, size_t /*length*/, DataSink & /*sink*/) {
        // Give up after enough passes to show the spin, so that losing the
        // check below fails this test instead of hanging it.
        return ++call_count < 100;
      },
      "text/plain");

  ASSERT_FALSE(res);
  EXPECT_EQ(Error::Write, res.error());
  EXPECT_EQ(1, call_count.load());
}

TEST(DataSinkTest, OptionalCallbacksAreCallableByDefault) {
  // A writer only has to assign `write`. The other three used to be left as
  // empty std::functions, so a provider calling one threw
  // std::bad_function_call out of the thread running it and took the whole
  // process down.
  DataSink sink;

  std::string written;
  sink.write = [&](const char *data, size_t data_len) {
    written.append(data, data_len);
    return true;
  };

  EXPECT_TRUE(sink.is_writable());
  sink.done();
  sink.done_with_trailer(Headers{{"X-Trailer", "value"}});
  EXPECT_TRUE(written.empty());
}

TEST(DataSinkTest, DoneWithTrailerFallsBackToDone) {
  // A sink that cannot carry trailers still has to finish.
  DataSink sink;

  auto done_count = 0;
  sink.done = [&]() { done_count++; };

  sink.done_with_trailer(Headers{{"X-Trailer", "value"}});
  EXPECT_EQ(1, done_count);
}

TEST(DataSinkTest, LengthFramedProviderMayCallDoneAfterWritingEverything) {
  Server svr;

  const std::string body(4096, 'x');

  svr.Get("/", [&](const Request & /*req*/, Response &res) {
    res.set_content_provider(body.size(), "text/plain",
                             [&](size_t offset, size_t length, DataSink &sink) {
                               sink.write(body.data() + offset, length);
                               sink.done();
                               return true;
                             });
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get("/");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(body, res->body);
}

TEST(DataSinkTest, LengthFramedProviderThatFinishesEarlyFailsTheResponse) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        1024, "text/plain",
        [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
          sink.write("hello", 5);
          sink.done(); // short of the 1024 bytes the response promised
          return true;
        });
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_read_timeout(5, 0);

  // The response is short of its Content-Length, so the client cannot read a
  // complete body. What matters is that this returns at all: a no-op done()
  // would leave the writer looping over a provider that never makes progress.
  auto res = cli.Get("/");
  EXPECT_FALSE(res);
}

// Read as the next response by a peer that sees it after a framed body.
static const std::string smuggled_response =
    "HTTP/1.1 200 OK\r\nContent-Length: 8\r\n\r\nSMUGGLED";

TEST(DataSinkTest, LengthFramedProviderCannotWritePastTheLength) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_content_provider(
        5, "text/plain",
        [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
          auto data = "AAAAA" + smuggled_response;
          sink.write(data.data(), data.size());
          return true;
        });
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  std::string resp;
  ASSERT_TRUE(send_request(1, "GET / HTTP/1.1\r\nHost: x\r\n\r\n", &resp));
  EXPECT_EQ("AAAAA", resp.substr(resp.find("\r\n\r\n") + 4));

  resp.clear();
  ASSERT_TRUE(send_request(
      1, "GET / HTTP/1.1\r\nHost: x\r\nRange: bytes=0-1\r\n\r\n", &resp));
  EXPECT_EQ("AA", resp.substr(resp.find("\r\n\r\n") + 4));
}

TEST(NoContentTest, BodyIsNotSent) {
  Server svr;

  svr.Get("/204", [](const Request & /*req*/, Response &res) {
    res.status = StatusCode::NoContent_204;
    res.set_content(smuggled_response, "text/plain");
  });
  svr.Get("/304", [](const Request & /*req*/, Response &res) {
    res.status = StatusCode::NotModified_304;
    res.set_chunked_content_provider(
        "text/plain", [](size_t /*offset*/, DataSink &sink) {
          sink.write(smuggled_response.data(), smuggled_response.size());
          sink.done();
          return true;
        });
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  for (auto path : {"/204", "/304"}) {
    std::string resp;
    ASSERT_TRUE(send_request(
        1, std::string("GET ") + path + " HTTP/1.1\r\nHost: x\r\n\r\n", &resp));
    EXPECT_EQ(resp.size(), resp.find("\r\n\r\n") + 4) << path;
    EXPECT_EQ(std::string::npos, resp.find("Content-Length")) << path;
    EXPECT_EQ(std::string::npos, resp.find("Transfer-Encoding")) << path;
  }
}

TEST(DataSinkTest, RequestProviderCannotWritePastTheLength) {
  Server svr;

  std::atomic<bool> smuggled(false);
  svr.Post("/", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });
  svr.Get("/smuggled", [&](const Request & /*req*/, Response & /*res*/) {
    smuggled = true;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // What follows the body would be read as the next request.
  Client cli(HOST, port);
  auto res = cli.Post(
      "/", 5,
      [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        std::string data = "helloGET /smuggled HTTP/1.1\r\nHost: x\r\n\r\n";
        sink.write(data.data(), data.size());
        return true;
      },
      "text/plain");

  ASSERT_FALSE(res);
  EXPECT_EQ(Error::Write, res.error());
  EXPECT_FALSE(smuggled);
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST(DataSinkTest, CompressedRequestProviderThatFinishesEarlyFails) {
  // The compressed path builds the whole body before connecting, so this
  // fails client-side and never reaches a server.
  Client cli(HOST, PORT);
  cli.set_compress(true);

  auto res = cli.Post(
      "/", 1024,
      [](size_t /*offset*/, size_t /*length*/, DataSink &sink) {
        sink.write("hello", 5);
        sink.done(); // short of the 1024 bytes the request announced
        return true;
      },
      "text/plain");

  ASSERT_FALSE(res);
  EXPECT_EQ(Error::Write, res.error());
}
#endif

TEST(ErrorHandlerWithContentProviderTest, ErrorHandler) {
  Server svr;

  svr.set_error_handler([](Request const &, Response &res) -> void {
    res.set_chunked_content_provider(
        "text/plain", [](std::size_t const, DataSink &sink) -> bool {
          sink.os << "hello";
          sink.os << "world";
          sink.done();
          return true;
        });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
  EXPECT_EQ("helloworld", res->body);
}

// A body set after a content provider must replace it, not be sent through it.
TEST(ResponseContentSourceTest, FileRequestHandlerCanReplaceFile) {
  Server svr;
  svr.set_mount_point("/", "./www");
  svr.set_file_request_handler([](const Request &req, Response &res) {
    if (req.path == "/dir/test.html") {
      res.status = StatusCode::Forbidden_403;
      res.set_content(std::string(5000, 'D'), "text/plain");
    } else if (req.path == "/file") {
      res.status = StatusCode::Forbidden_403;
      res.body = "Denied";
    }
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);

  {
    auto res = cli.Get("/dir/test.html");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Forbidden_403, res->status);
    EXPECT_EQ(std::string(5000, 'D'), res->body);
    EXPECT_EQ(1U, res->get_header_value_count("Content-Type"));
  }

  {
    auto res = cli.Get("/file");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::Forbidden_403, res->status);
    EXPECT_EQ("Denied", res->body);
  }

  {
    auto res = cli.Get("/dir/index.html");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ(0U, res->body.find("<html>"));
  }
}

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
TEST(ResponseContentSourceTest, ErrorAndExceptionHandlersReplaceProvider) {
  Server svr;

  std::vector<bool> released;
  std::mutex released_mutex;
  auto releaser = [&](bool success) {
    std::lock_guard<std::mutex> guard(released_mutex);
    released.push_back(success);
  };

  auto provider = [](size_t offset, size_t length, DataSink &sink) {
    return sink.write(&"hello"[offset], length);
  };

  svr.Get("/sized", [&](const Request &, Response &res) {
    res.status = StatusCode::NotFound_404;
    res.set_content_provider(5, "text/plain", provider, releaser);
  });
  svr.Get("/chunked", [&](const Request &, Response &res) {
    res.status = StatusCode::ServiceUnavailable_503;
    res.set_chunked_content_provider(
        "text/plain",
        [](size_t, DataSink &sink) {
          sink.os << "chunk";
          sink.done();
          return true;
        },
        releaser);
  });
  svr.Get("/throw", [&](const Request &, Response &res) -> void {
    res.set_content_provider(5, "text/plain", provider, releaser);
    throw std::runtime_error("after the provider");
  });

  svr.set_error_handler([](const Request &req, Response &res) {
    // Leave the exception handler's content to it.
    if (req.path == "/throw") { return Server::HandlerResponse::Unhandled; }
    res.set_content(std::string(1000, 'E'), "text/html");
    return Server::HandlerResponse::Handled;
  });
  svr.set_exception_handler(
      [](const Request &, Response &res, std::exception_ptr) {
        res.status = StatusCode::InternalServerError_500;
        res.set_content(std::string(1000, 'X'), "text/html");
      });

  auto port = svr.bind_to_any_port(HOST);
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);

  {
    auto res = cli.Get("/sized");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::NotFound_404, res->status);
    EXPECT_EQ(std::string(1000, 'E'), res->body);
    EXPECT_EQ("text/html", res->get_header_value("Content-Type"));
  }

  {
    auto res = cli.Get("/chunked");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::ServiceUnavailable_503, res->status);
    EXPECT_EQ(std::string(1000, 'E'), res->body);
    EXPECT_FALSE(res->has_header("Transfer-Encoding"));
  }

  {
    auto res = cli.Get("/throw");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
    EXPECT_EQ(std::string(1000, 'X'), res->body);
  }

  std::lock_guard<std::mutex> guard(released_mutex);
  EXPECT_EQ((std::vector<bool>{false, false, false}), released);
}
#endif

TEST(ResponseContentSourceTest, LastContentSetterWins) {
  Server svr;

  auto abc = [](size_t offset, size_t length, DataSink &sink) {
    return sink.write(&"abc"[offset], length);
  };

  svr.Get("/file-then-body", [](const Request &, Response &res) {
    res.set_file_content("./www/dir/test.html");
    res.set_content("body", "text/plain");
  });
  svr.Get("/body-then-file", [](const Request &, Response &res) {
    res.set_content(std::string(100, 'B'), "text/plain");
    res.set_file_content("./www/dir/test.html");
  });
  svr.Get("/body-then-provider", [&](const Request &, Response &res) {
    res.set_content(std::string(100, 'B'), "text/plain");
    res.set_content_provider(3, "text/x-provider", abc);
  });
  svr.Get("/provider-then-body", [&](const Request &, Response &res) {
    res.set_content_provider(3, "text/x-provider", abc);
    res.set_content(std::string(100, 'B'), "text/plain");
  });
  svr.Get("/provider-then-file", [&](const Request &, Response &res) {
    res.set_content_provider(3, "text/x-provider", abc);
    res.set_file_content("./www/dir/test.html", "text/x-file");
  });
  svr.Get("/file-then-header", [](const Request &, Response &res) {
    res.set_file_content("./www/dir/test.html");
    res.set_header("Content-Type", "text/x-handler");
  });
  svr.Get("/provider-then-direct-body", [&](const Request &, Response &res) {
    res.set_content_provider(3, "text/plain", abc);
    res.body = "direct";
  });
  svr.Get("/file-then-direct-body", [](const Request &, Response &res) {
    res.set_file_content("./www/dir/test.html");
    res.body = "direct";
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);

  auto expect_body = [&](const char *path, const std::string &body,
                         const std::string &type) {
    // Uncompressed, so Content-Length can be compared with the body.
    auto res = cli.Get(path, Headers{{"Accept-Encoding", ""}});
    ASSERT_TRUE(res) << path << " Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status) << path;
    EXPECT_EQ(body, res->body) << path;
    EXPECT_EQ(std::to_string(body.size()),
              res->get_header_value("Content-Length"))
        << path;
    EXPECT_EQ(1u, res->get_header_value_count("Content-Type")) << path;
    EXPECT_EQ(type, res->get_header_value("Content-Type")) << path;
  };

  expect_body("/file-then-body", "body", "text/plain");
  expect_body("/body-then-file", "test.html", "text/html");
  expect_body("/body-then-provider", "abc", "text/x-provider");
  expect_body("/provider-then-body", std::string(100, 'B'), "text/plain");
  expect_body("/provider-then-file", "test.html", "text/x-file");
  expect_body("/file-then-header", "test.html", "text/x-handler");
  expect_body("/provider-then-direct-body", "direct", "text/plain");
  expect_body("/file-then-direct-body", "direct", "text/plain");

  // Ranges are checked against the body, not the dropped provider.
  {
    auto res = cli.Get("/provider-then-direct-body",
                       Headers{{make_range_header({{1, 2}})}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::PartialContent_206, res->status);
    EXPECT_EQ("ir", res->body);
  }
  {
    auto res = cli.Get("/file-then-direct-body",
                       Headers{{make_range_header({{7, 8}})}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::RangeNotSatisfiable_416, res->status);
  }
}

#if defined(CPPHTTPLIB_SSL_ENABLED) && !defined(_WIN32)
TEST(FileContentTest, TruncatedWhileServedEndsTheResponse) {
  const char *path = "./truncated_while_served.txt";
  const size_t size = 32 * 1024 * 1024;
  {
    std::ofstream f(path, std::ios::binary);
    f << std::string(size, 'x');
  }
  auto se_file = detail::scope_exit([&] { std::remove(path); });

  // Over TLS, where the bytes are encrypted in this process rather than
  // copied by send().
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  svr.Get("/file", [&](const Request &, Response &res) {
    res.set_file_content(path, "text/plain");
  });
  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // The file shrinks once the first bytes are in, as a rewrite in place
  // would, and reading the mapping past its new end used to raise SIGBUS.
  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  size_t received = 0;
  auto res = cli.Get("/file", [&](const char *, size_t len) {
    if (received == 0) { EXPECT_EQ(0, ::truncate(path, 0)); }
    received += len;
    return true;
  });
  EXPECT_FALSE(res);
  EXPECT_LT(received, size);
}
#endif

// Forward declaration (see the base64_encode note).
namespace httplib {
namespace detail {
void set_file_content_provider(Response &res, const std::shared_ptr<mmap> &m,
                               const std::string &content_type,
                               EncodingType encoding);
} // namespace detail
} // namespace httplib

TEST(ResponseContentSourceTest, FileContentProviderStaysWithinFile) {
  auto mm = std::make_shared<detail::mmap>("./www/dir/test.html");
  ASSERT_TRUE(mm->is_open());

  Response res;
  detail::set_file_content_provider(res, mm, "text/html",
                                    detail::EncodingType::None);

  std::string out;
  DataSink sink;
  sink.write = [&](const char *d, size_t l) {
    out.append(d, l);
    return true;
  };

  EXPECT_TRUE(res.content_provider_(0, mm->size() + 4096, sink));
  EXPECT_EQ("test.html", out);
  EXPECT_FALSE(res.content_provider_(mm->size(), 1, sink));
  EXPECT_EQ("test.html", out);
}

TEST(LongPollingTest, ClientCloseDetection) {
  Server svr;

  svr.Get("/events", [&](const Request & /*req*/, Response &res) {
    res.set_chunked_content_provider(
        "text/plain", [](std::size_t const, DataSink &sink) -> bool {
          EXPECT_TRUE(sink.is_writable()); // the socket is alive
          sink.os << "hello";

          auto count = 10;
          while (count > 0 && sink.is_writable()) {
            this_thread::sleep_for(chrono::milliseconds(10));
            count--;
          }
          EXPECT_FALSE(sink.is_writable()); // the socket is closed
          return true;
        });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  auto res = cli.Get("/events", [&](const char *data, size_t data_length) {
    EXPECT_EQ("hello", string(data, data_length));
    return false; // close the socket immediately.
  });

  ASSERT_FALSE(res);
}

TEST(LongPollingTest, ClientCloseDetectionWithStreamOperator) {
  Server svr;

  svr.Get("/events", [&](const Request & /*req*/, Response &res) {
    res.set_chunked_content_provider(
        "text/plain", [](std::size_t const, DataSink &sink) -> bool {
          EXPECT_TRUE(sink.is_writable()); // the socket is alive
          sink.os << "hello";
          EXPECT_TRUE(sink.os.good());

          // Wait for the client to close the connection
          auto count = 10;
          while (count > 0 && sink.is_writable()) {
            this_thread::sleep_for(chrono::milliseconds(10));
            count--;
          }

          // After client disconnect, write repeatedly until the socket
          // write actually fails (small writes may be absorbed by the
          // kernel buffer)
          std::string chunk(1024, 'x');
          for (int i = 0; i < 1000 && sink.os.good(); i++) {
            sink.os << chunk;
          }
          EXPECT_TRUE(sink.os.fail());

          return true;
        });
  });

  auto port = svr.bind_to_any_port("localhost");
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", port);

  auto res = cli.Get("/events", [&](const char *data, size_t data_length) {
    EXPECT_EQ("hello", string(data, data_length));
    return false; // close the socket immediately.
  });

  ASSERT_FALSE(res);
}

TEST(GetWithParametersTest, GetWithParameters) {
  Server svr;

  svr.Get("/", [&](const Request &req, Response &) {
    EXPECT_EQ("world", req.get_param_value("hello"));
    EXPECT_EQ("world2", req.get_param_value("hello2"));
    EXPECT_EQ("world3", req.get_param_value("hello3"));
  });

  svr.Get("/params", [&](const Request &req, Response &) {
    EXPECT_EQ("world", req.get_param_value("hello"));
    EXPECT_EQ("world2", req.get_param_value("hello2"));
    EXPECT_EQ("world3", req.get_param_value("hello3"));
  });

  svr.Get(R"(/resources/([a-z0-9\\-]+))", [&](const Request &req, Response &) {
    EXPECT_EQ("resource-id", req.matches[1]);
    EXPECT_EQ("foo", req.get_param_value("param1"));
    EXPECT_EQ("bar", req.get_param_value("param2"));
  });

  svr.Get("/users/:id", [&](const Request &req, Response &) {
    EXPECT_EQ("user-id", req.path_params.at("id"));
    EXPECT_EQ("foo", req.get_param_value("param1"));
    EXPECT_EQ("bar", req.get_param_value("param2"));
  });

  auto listen_thread = std::thread([&svr]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);

    Params params;
    params.emplace("hello", "world");
    params.emplace("hello2", "world2");
    params.emplace("hello3", "world3");
    auto res = cli.Get("/", params, Headers{});

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/params?hello=world&hello2=world2&hello3=world3");

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/resources/resource-id?param1=foo&param2=bar");

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  {
    Client cli(HOST, PORT);

    auto res = cli.Get("/users/user-id?param1=foo&param2=bar");

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(GetWithParametersTest, GetWithParameters2) {
  Server svr;

  svr.Get("/", [&](const Request &req, Response &res) {
    auto text = req.get_param_value("hello");
    res.set_content(text, "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  Params params;
  params.emplace("hello", "world");

  std::string body;
  auto res = cli.Get("/", params, Headers{},
                     [&](const char *data, size_t data_length) {
                       body.append(data, data_length);
                       return true;
                     });

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("world", body);
}

TEST(GetWithParametersTest, GetWithParamsOnlyNoHeaders) {
  Server svr;

  svr.Get("/search", [&](const Request &req, Response &res) {
    auto q = req.get_param_value("q");
    res.set_content(q, "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  // Verify that Get(path, params) works without requiring Headers argument
  auto res = cli.Get("/search", httplib::Params{{"q", "cpp-httplib"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("cpp-httplib", res->body);
}

TEST(ClientDefaultHeadersTest, DefaultHeaders_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/range/32"};

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli(host);
#else
  Client cli(host);
#endif

  cli.set_default_headers({make_range_header({{1, 10}})});
  cli.set_connection_timeout(5);

  {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("bcdefghijk", res->body);
    EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  }

  {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("bcdefghijk", res->body);
    EXPECT_EQ(StatusCode::PartialContent_206, res->status);
  }
}

TEST(ServerDefaultHeadersTest, DefaultHeaders) {
  Server svr;
  svr.set_default_headers({{"Hello", "World"}});

  svr.Get("/", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);

  auto res = cli.Get("/");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("ok", res->body);
  EXPECT_EQ("World", res->get_header_value("Hello"));
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(KeepAliveTest, ReadTimeoutSSL) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/a", [&](const Request & /*req*/, Response &res) {
    std::this_thread::sleep_for(std::chrono::seconds(2));
    res.set_content("a", "text/plain");
  });

  svr.Get("/b", [&](const Request & /*req*/, Response &res) {
    res.set_content("b", "text/plain");
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli("localhost", PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_keep_alive(true);
  cli.set_read_timeout(std::chrono::seconds(1));

  auto resa = cli.Get("/a");
  ASSERT_TRUE(!resa);
  EXPECT_EQ(Error::Read, resa.error());

  auto resb = cli.Get("/b");
  ASSERT_TRUE(resb);
  EXPECT_EQ(StatusCode::OK_200, resb->status);
  EXPECT_EQ("b", resb->body);
}

// Closing an idle keep-alive connection sends close_notify and returns. The
// server must not wait for the client's close_notify: an idle client never
// sends one, so the worker would be held until the read timeout expires, and
// stop() would wait for it.
TEST(KeepAliveTest, SSLIdleCloseDoesNotWaitForPeer) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.set_keep_alive_timeout(1);
  svr.set_read_timeout(10, 0);
  svr.Get("/", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto listen_thread = std::thread([&svr]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    if (listen_thread.joinable()) {
      svr.stop();
      listen_thread.join();
    }
  });
  svr.wait_until_ready();

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(false);
  cli.set_keep_alive(true);
  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  // Stay idle past the keep-alive timeout so the server closes the connection.
  std::this_thread::sleep_for(std::chrono::milliseconds(1500));

  auto start = std::chrono::steady_clock::now();
  svr.stop();
  listen_thread.join();
  auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
                     std::chrono::steady_clock::now() - start)
                     .count();
  EXPECT_LT(elapsed, 3000);
}
#endif

class ServerTestWithAI_PASSIVE : public ::testing::Test {
protected:
  ServerTestWithAI_PASSIVE()
      : cli_(HOST, PORT)
#ifdef CPPHTTPLIB_SSL_ENABLED
        ,
        svr_(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE)
#endif
  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli_.enable_server_certificate_verification(false);
#endif
  }

  virtual void SetUp() {
    svr_.Get("/hi", [&](const Request & /*req*/, Response &res) {
      res.set_content("Hello World!", "text/plain");
    });

    t_ = thread(
        [&]() { ASSERT_TRUE(svr_.listen(std::string(), PORT, AI_PASSIVE)); });

    svr_.wait_until_ready();
  }

  virtual void TearDown() {
    svr_.stop();
    t_.join();
  }

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli_;
  SSLServer svr_;
#else
  Client cli_;
  Server svr_;
#endif
  thread t_;
};

TEST_F(ServerTestWithAI_PASSIVE, GetMethod200) {
  auto res = cli_.Get("/hi");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("text/plain", res->get_header_value("Content-Type"));
  EXPECT_EQ("Hello World!", res->body);
}

class ServerUpDownTest : public ::testing::Test {
protected:
  ServerUpDownTest() : cli_(HOST, PORT) {}

  virtual void SetUp() {
    t_ = thread([&]() {
      svr_.bind_to_any_port(HOST);
      std::this_thread::sleep_for(std::chrono::milliseconds(500));
      ASSERT_TRUE(svr_.listen_after_bind());
    });

    svr_.wait_until_ready();
  }

  virtual void TearDown() {
    svr_.stop();
    t_.join();
  }

  Client cli_;
  Server svr_;
  thread t_;
};

TEST_F(ServerUpDownTest, QuickStartStop) {
  // Should not crash, especially when run with
  // --gtest_filter=ServerUpDownTest.QuickStartStop --gtest_repeat=1000
}

class PayloadMaxLengthTest : public ::testing::Test {
protected:
  PayloadMaxLengthTest()
      : cli_(HOST, PORT)
#ifdef CPPHTTPLIB_SSL_ENABLED
        ,
        svr_(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE)
#endif
  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli_.enable_server_certificate_verification(false);
#endif
  }

  virtual void SetUp() {
    svr_.set_payload_max_length(8);

    svr_.Post("/test", [&](const Request & /*req*/, Response &res) {
      res.set_content("test", "text/plain");
    });

    t_ = thread([&]() { ASSERT_TRUE(svr_.listen(HOST, PORT)); });

    svr_.wait_until_ready();
  }

  virtual void TearDown() {
    svr_.stop();
    t_.join();
  }

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli_;
  SSLServer svr_;
#else
  Client cli_;
  Server svr_;
#endif
  thread t_;
};

TEST_F(PayloadMaxLengthTest, ExceedLimit) {
  auto res = cli_.Post("/test", "123456789", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PayloadTooLarge_413, res->status);

  res = cli_.Post("/test", "12345678", "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(PayloadMaxLengthTest, ChunkedEncodingSecurityTest) {
  // Test chunked encoding with payload exceeding the 8-byte limit
  std::string large_chunked_data(16, 'A'); // 16 bytes, exceeds 8-byte limit

  auto res = cli_.Post("/test", large_chunked_data, "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PayloadTooLarge_413, res->status);
}

TEST_F(PayloadMaxLengthTest, ChunkedEncodingWithinLimit) {
  // Test chunked encoding with payload within the 8-byte limit
  std::string small_chunked_data(4, 'B'); // 4 bytes, within 8-byte limit

  auto res = cli_.Post("/test", small_chunked_data, "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(PayloadMaxLengthTest, RawSocketChunkedTest) {
  // Test using send_request to send chunked data exceeding payload limit
  std::string chunked_request = "POST /test HTTP/1.1\r\n"
                                "Host: " +
                                std::string(HOST) + ":" + std::to_string(PORT) +
                                "\r\n"
                                "Transfer-Encoding: chunked\r\n"
                                "Connection: close\r\n"
                                "\r\n"
                                "a\r\n" // 10 bytes chunk (exceeds 8-byte limit)
                                "0123456789\r\n"
                                "0\r\n" // End chunk
                                "\r\n";

  std::string response;
  bool result = send_request(1, chunked_request, &response);

  if (!result) {
    // If send_request fails, it might be because the server closed the
    // connection due to payload limit enforcement, which is acceptable
    SUCCEED()
        << "Server rejected oversized chunked request (connection closed)";
  } else {
    // If we got a response, check if it's an error response or connection was
    // closed early Short response length indicates connection was closed due to
    // payload limit
    if (response.length() <= 10) {
      SUCCEED() << "Server closed connection for oversized chunked request";
    } else {
      // Check for error status codes
      EXPECT_TRUE(response.find("413") != std::string::npos ||
                  response.find("Payload Too Large") != std::string::npos ||
                  response.find("400") != std::string::npos);
    }
  }
}

class LargePayloadMaxLengthTest : public ::testing::Test {
protected:
  LargePayloadMaxLengthTest()
      : cli_(HOST, PORT)
#ifdef CPPHTTPLIB_SSL_ENABLED
        ,
        svr_(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE)
#endif
  {
#ifdef CPPHTTPLIB_SSL_ENABLED
    cli_.enable_server_certificate_verification(false);
#endif
  }

  virtual void SetUp() {
    // Set 10MB payload limit
    const size_t LARGE_PAYLOAD_LIMIT = 10 * 1024 * 1024; // 10MB
    svr_.set_payload_max_length(LARGE_PAYLOAD_LIMIT);

    svr_.Post("/test", [&](const Request & /*req*/, Response &res) {
      res.set_content("Large payload test", "text/plain");
    });

    t_ = thread([&]() { ASSERT_TRUE(svr_.listen(HOST, PORT)); });
    svr_.wait_until_ready();
  }

  virtual void TearDown() {
    svr_.stop();
    t_.join();
  }

#ifdef CPPHTTPLIB_SSL_ENABLED
  SSLClient cli_;
  SSLServer svr_;
#else
  Client cli_;
  Server svr_;
#endif
  thread t_;
};

TEST_F(LargePayloadMaxLengthTest, ChunkedEncodingWithin10MB) {
  // Test chunked encoding with payload within 10MB limit
  std::string medium_payload(5 * 1024 * 1024,
                             'A'); // 5MB payload, within 10MB limit

  auto res = cli_.Post("/test", medium_payload, "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST_F(LargePayloadMaxLengthTest, ChunkedEncodingExceeds10MB) {
  // Test chunked encoding with payload exceeding 10MB limit
  std::string large_payload(12 * 1024 * 1024,
                            'B'); // 12MB payload, exceeds 10MB limit

  auto res = cli_.Post("/test", large_payload, "application/octet-stream");
  // Server may either return 413 or close the connection
  if (res) {
    EXPECT_EQ(StatusCode::PayloadTooLarge_413, res->status);
  } else {
    SUCCEED() << "Server closed connection for payload exceeding 10MB limit";
  }
}

TEST(ClientPayloadTest, DoesNotReserveTheClaimedLength) {
  Server svr;
  svr.Get("/", [](const Request &, Response &res) {
    // Claims the most the client accepts, far more than it sends, then drops
    // the connection.
    res.set_content_provider(std::string().max_size(), "text/plain",
                             [](size_t, size_t, DataSink &sink) {
                               sink.write("abc", 3);
                               return false;
                             });
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.set_payload_max_length(0);
  EXPECT_FALSE(cli.Get("/"));
}

// A response body over the limit is reported as ExceedMaxPayloadSize, as the
// Stream API does, not as a plain read failure
TEST(ClientPayloadTest, OverLimitIsExceedMaxPayloadSize) {
  Server svr;
  svr.Get("/big", [](const Request &, Response &res) {
    res.set_content(std::string(100000, 'b'), "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_payload_max_length(1000);

  auto res = cli.Get("/big", Headers{{"Accept-Encoding", ""}});
  EXPECT_EQ(Error::ExceedMaxPayloadSize, res.error());

  res = cli.Get("/big", Headers{{"Accept-Encoding", ""}},
                [](const char *, size_t) { return true; });
  EXPECT_EQ(Error::ExceedMaxPayloadSize, res.error());

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
  // Small on the wire, over the limit once decompressed
  res = cli.Get("/big", Headers{{"Accept-Encoding", "gzip"}});
  EXPECT_EQ(Error::ExceedMaxPayloadSize, res.error());
#endif
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
// `payload_max_length` is not enforced on decompressed body in ContentReader
// path.
TEST(PayloadLimitBypassTest, StreamingGzipDecompression) {
  Server svr;
  const size_t LIMIT = 64 * 1024; // 64KB
  svr.set_payload_max_length(LIMIT);

  size_t total = 0;
  svr.Post("/stream", [&](const Request & /*req*/, Response &res,
                          const ContentReader &content_reader) {
    content_reader([&](const char * /*data*/, size_t len) {
      total += len;
      return true;
    });
    res.status = 200;
    res.set_content("stream_ok", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // Prepare 256KB raw data and gzip-compress it
  std::string raw(256 * 1024, 'A');
  std::string gz;
  {
    z_stream zs{};
    deflateInit2(&zs, Z_BEST_COMPRESSION, Z_DEFLATED, 15 + 16, 8,
                 Z_DEFAULT_STRATEGY);
    zs.next_in = reinterpret_cast<Bytef *>(const_cast<char *>(raw.data()));
    zs.avail_in = static_cast<uInt>(raw.size());
    char outbuf[4096];
    int ret;
    do {
      zs.next_out = reinterpret_cast<Bytef *>(outbuf);
      zs.avail_out = sizeof(outbuf);
      ret = deflate(&zs, Z_FINISH);
      gz.append(outbuf, sizeof(outbuf) - zs.avail_out);
    } while (ret != Z_STREAM_END);
    deflateEnd(&zs);
  }

  Client cli(HOST, PORT);
  cli.set_connection_timeout(std::chrono::seconds(5));
  Headers headers = {{"Content-Encoding", "gzip"}};
  auto res = cli.Post("/stream", headers, gz.data(), gz.size(),
                      "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  // Server must reject oversized decompressed payloads with 413.
  EXPECT_EQ(StatusCode::PayloadTooLarge_413, res->status);

  // Decompressed bytes delivered to the handler must not exceed LIMIT.
  EXPECT_LE(total, LIMIT);
}

#endif

// Some servers misuse Content-Encoding to advertise a character set, e.g.
// `Content-Encoding: UTF-8` on a JPEG. Such a value is not a content coding, so
// the payload must be passed through untouched instead of being rejected.
TEST(ContentEncodingTest, UnknownEncodingIsPassedThrough) {
  const std::string body = "\xff\xd8\xff\xe0 not really a jpeg";

  Server svr;

  svr.Get("/image", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.set_header("Content-Encoding", "UTF-8");
  });

  svr.Get("/identity", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.set_header("Content-Encoding", "identity");
  });

  svr.Post("/echo", [](const Request &req, Response &res) {
    res.set_content(req.body, "image/jpeg");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  {
    auto res = cli.Get("/image");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ(body, res->body);
  }

  {
    auto res = cli.Get("/identity");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ(body, res->body);
  }

  {
    // The same applies to a request body reaching the server.
    Headers headers = {{"Content-Encoding", "UTF-8"}};
    auto res = cli.Post("/echo", headers, body, "image/jpeg");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ(body, res->body);
  }
}

// "Hello World!" as gzip. Hard-coded so that the test below can serve a
// gzip-encoded response even when the build has no zlib support.
static const char GZIPPED_HELLO_WORLD[] = {
    '\x1f', '\x8b', '\x08', '\x00', '\x00', '\x00', '\x00', '\x00',
    '\x02', '\x03', '\xf3', '\x48', '\xcd', '\xc9', '\xc9', '\x57',
    '\x08', '\xcf', '\x2f', '\xca', '\x49', '\x51', '\x04', '\x00',
    '\xa3', '\x1c', '\x29', '\x1c', '\x0c', '\x00', '\x00', '\x00'};

// A content coding is a whole token, not something the field value merely
// contains. Matching "br" and "zstd" as substrings made unrelated values such
// as "fibre" look like Brotli, and turned a multi-coding value like
// "gzip, br" into a Brotli-labeled body, so a decompressor was run over data
// it was never meant to see.
TEST(ContentEncodingTest, SubstringOfACodingIsNotTheCoding) {
  const std::string body = "\xff\xd8\xff\xe0 not really a jpeg";

  Server svr;

  svr.Get("/fibre", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.set_header("Content-Encoding", "fibre");
  });

  svr.Get("/multi", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.set_header("Content-Encoding", "gzip, br");
  });

  svr.Get("/zstdish", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.set_header("Content-Encoding", "x-zstd-ish");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  for (const char *path : {"/fibre", "/multi", "/zstdish"}) {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << path << " -> " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status) << path;
    // Not a coding we recognize, so the payload comes back untouched
    EXPECT_EQ(body, res->body) << path;
  }
}

// A content coding cpp-httplib recognizes but was not built with must be
// reported as such. Handing the still-compressed payload back to the caller
// would silently corrupt it.
TEST(ContentEncodingTest, KnownEncodingWithoutSupportIsReported) {
  const std::string gzipped(GZIPPED_HELLO_WORLD, sizeof(GZIPPED_HELLO_WORLD));

  Server svr;

  // "image/jpeg" keeps the server from applying a content coding of its own,
  // so the hand-crafted Content-Encoding below survives.
  svr.Get("/gzipped", [&](const Request & /*req*/, Response &res) {
    res.set_content(gzipped, "image/jpeg");
    res.set_header("Content-Encoding", "gzip");
  });

  // Content codings are case-insensitive (RFC 9110 8.4.1).
  svr.Get("/gzipped-uppercase", [&](const Request & /*req*/, Response &res) {
    res.set_content(gzipped, "image/jpeg");
    res.set_header("Content-Encoding", "GZIP");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  {
    auto res = cli.Get("/gzipped");
#ifdef CPPHTTPLIB_ZLIB_SUPPORT
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("Hello World!", res->body);
#else
    ASSERT_FALSE(res);
    EXPECT_EQ(Error::UnsupportedContentEncoding, res.error());
#endif
  }

  {
    // open_stream() must behave the same way.
    auto handle = cli.open_stream("GET", "/gzipped");
#ifdef CPPHTTPLIB_ZLIB_SUPPORT
    ASSERT_TRUE(handle.is_valid());
    std::string received;
    char buf[256];
    ssize_t n;
    while ((n = handle.read(buf, sizeof(buf))) > 0) {
      received.append(buf, static_cast<size_t>(n));
    }
    EXPECT_EQ("Hello World!", received);
#else
    EXPECT_FALSE(handle.is_valid());
    EXPECT_EQ(Error::UnsupportedContentEncoding, handle.error);
#endif
  }

  {
    // A differently-cased coding must not be mistaken for an unknown one, or
    // the body would be handed back still compressed.
    auto res = cli.Get("/gzipped-uppercase");
#ifdef CPPHTTPLIB_ZLIB_SUPPORT
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("Hello World!", res->body);
#else
    ASSERT_FALSE(res);
    EXPECT_EQ(Error::UnsupportedContentEncoding, res.error());
#endif
  }
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
// A handler serving pre-compressed content (e.g. build-time gzipped static
// assets) sets Content-Encoding itself. The server used to pick a coding from
// Accept-Encoding and the content type alone, gzipping the already-gzipped
// body a second time and appending a second Content-Encoding field line, so
// clients that decode one coding per listed value handed back raw gzip bytes.
TEST(ContentEncodingTest, PreEncodedResponseIsNotCompressedAgain) {
  const std::string gzipped(GZIPPED_HELLO_WORLD, sizeof(GZIPPED_HELLO_WORLD));

  Server svr;

  // text/plain is a compressible type, so only the pre-set Content-Encoding
  // keeps the server from applying a coding of its own.
  svr.Get("/pre-gzipped", [&](const Request & /*req*/, Response &res) {
    res.set_content(gzipped, "text/plain");
    res.set_header("Content-Encoding", "gzip");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  Headers headers = {{"Accept-Encoding", "gzip"}};
  auto res = cli.Get("/pre-gzipped", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(1U, res->get_header_value_count("Content-Encoding"));
  EXPECT_EQ("Hello World!", res->body);
}

// set_compress(false) sends every handler response as it is, buffered or
// streamed
TEST(ContentEncodingTest, SetCompressFalseSendsIdentity) {
  const std::string text(1000, 'a');

  Server svr;
  svr.set_compress(false);
  svr.Get("/buffered", [&](const Request &, Response &res) {
    res.set_content(text, "text/plain");
  });
  svr.Get("/streamed", [&](const Request &, Response &res) {
    res.set_chunked_content_provider("text/plain", [&](size_t, DataSink &sink) {
      sink.write(text.data(), text.size());
      sink.done();
      return true;
    });
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_LT(0, port);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_decompress(false);
  for (auto path : {"/buffered", "/streamed"}) {
    SCOPED_TRACE(path);
    auto res = cli.Get(path, Headers{{"Accept-Encoding", "gzip"}});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_FALSE(res->has_header("Content-Encoding"));
    EXPECT_EQ(text, res->body);
  }
}

// A chunked provider settles its coding where the headers are written and
// reuses it at write time. Both ends of that have to hold: a handler's own
// Content-Encoding suppresses the coding, and a response without one is still
// compressed as it always was.
TEST(ContentEncodingTest, PreEncodedChunkedResponseIsNotCompressedAgain) {
  const std::string gzipped(GZIPPED_HELLO_WORLD, sizeof(GZIPPED_HELLO_WORLD));
  const std::string plain = "Hello World! Hello World! Hello World!";

  Server svr;

  svr.Get("/pre-gzipped", [&](const Request & /*req*/, Response &res) {
    res.set_header("Content-Encoding", "gzip");
    res.set_chunked_content_provider(
        "text/plain", [gzipped](size_t /*offset*/, DataSink &sink) {
          sink.write(gzipped.data(), gzipped.size());
          sink.done();
          return true;
        });
  });

  svr.Get("/negotiated", [&](const Request & /*req*/, Response &res) {
    res.set_chunked_content_provider(
        "text/plain", [plain](size_t /*offset*/, DataSink &sink) {
          sink.write(plain.data(), plain.size());
          sink.done();
          return true;
        });
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  Headers headers = {{"Accept-Encoding", "gzip"}};

  {
    auto res = cli.Get("/pre-gzipped", headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ(1U, res->get_header_value_count("Content-Encoding"));
    EXPECT_EQ("Hello World!", res->body);
  }

  {
    auto res = cli.Get("/negotiated", headers);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
    EXPECT_EQ(plain, res->body);
  }
}
#endif

// RFC 9110 Section 5.3: a Content-Encoding split over several field lines is
// the same message as the comma-joined one, so both have to be read the same
// way. Reading only the first line made "gzip" followed by "gzip" look like a
// single gzip coding, and a body the sender says was encoded twice was handed
// back after one pass, still compressed but presented as decoded.
TEST(ContentEncodingTest, DuplicateFieldLinesAreTheSameAsTheJoinedValue) {
  const std::string body = "\xff\xd8\xff\xe0 not really a jpeg";

  Server svr;
  svr.Get("/split", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.headers.emplace("Content-Encoding", "gzip");
    res.headers.emplace("Content-Encoding", "gzip");
  });
  svr.Get("/joined", [&](const Request & /*req*/, Response &res) {
    res.set_content(body, "image/jpeg");
    res.set_header("Content-Encoding", "gzip, gzip");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  // Two codings is not something cpp-httplib decodes, so both representations
  // take the pass-through path rather than one of them being gunzipped once.
  for (const char *path : {"/split", "/joined"}) {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << path << " -> " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status) << path;
    EXPECT_EQ(body, res->body) << path;
  }
}

// Regression test for DoS vulnerability: a malicious server sending a response
// without Content-Length header must not cause unbounded memory consumption on
// the client side. The client should stop reading after a reasonable limit,
// similar to the server-side set_payload_max_length protection.
TEST(ClientVulnerabilityTest, UnboundedReadWithoutContentLength) {
  constexpr size_t CLIENT_READ_LIMIT = 2 * 1024 * 1024; // 2MB safety limit

#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto server_thread = std::thread([] {
    constexpr size_t MALICIOUS_DATA_SIZE = 10 * 1024 * 1024; // 10MB from server
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      char buf[4096];
      ::recv(cli, buf, sizeof(buf), 0);

      // Malicious response: no Content-Length, no chunked encoding
      std::string response_header = "HTTP/1.1 200 OK\r\n"
                                    "Connection: close\r\n"
                                    "\r\n";

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response_header.c_str()),
             static_cast<int>(response_header.size()),
#else
             response_header.c_str(), response_header.size(),
#endif
             0);

      // Send 10MB of data
      std::string chunk(64 * 1024, 'A');
      size_t total_sent = 0;

      while (total_sent < MALICIOUS_DATA_SIZE) {
        auto to_send = std::min(chunk.size(), MALICIOUS_DATA_SIZE - total_sent);
        auto sent = ::send(cli,
#ifdef _WIN32
                           static_cast<const char *>(chunk.c_str()),
                           static_cast<int>(to_send),
#else
                           chunk.c_str(), to_send,
#endif
                           0);
        if (sent <= 0) break;
        total_sent += static_cast<size_t>(sent);
      }

      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  size_t total_read = 0;

  {
    Client cli("127.0.0.1", PORT + 2);
    cli.set_read_timeout(5, 0);
    cli.set_payload_max_length(CLIENT_READ_LIMIT);

    auto stream = cli.open_stream("GET", "/malicious");
    ASSERT_TRUE(stream.is_valid());

    char buffer[64 * 1024];
    ssize_t n;

    while ((n = stream.read(buffer, sizeof(buffer))) > 0) {
      total_read += static_cast<size_t>(n);
    }
  } // StreamHandle and Client destroyed here, closing the socket

  server_thread.join();

  // With set_payload_max_length, the client must stop reading before consuming
  // all 10MB. The read loop should be cut off at or near the configured limit.
  EXPECT_LE(total_read, CLIENT_READ_LIMIT)
      << "Client read " << total_read << " bytes, exceeding the configured "
      << "payload_max_length of " << CLIENT_READ_LIMIT << " bytes.";
}

// Verify that set_payload_max_length(0) means "no limit" and allows reading
// the entire response body without truncation.
TEST(ClientVulnerabilityTest, PayloadMaxLengthZeroMeansNoLimit) {
  static constexpr size_t DATA_SIZE = 4 * 1024 * 1024; // 4MB from server

#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto server_thread = std::thread([] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      char buf[4096];
      ::recv(cli, buf, sizeof(buf), 0);

      std::string response_header = "HTTP/1.1 200 OK\r\n"
                                    "Connection: close\r\n"
                                    "\r\n";

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response_header.c_str()),
             static_cast<int>(response_header.size()),
#else
             response_header.c_str(), response_header.size(),
#endif
             0);

      std::string chunk(64 * 1024, 'A');
      size_t total_sent = 0;

      while (total_sent < DATA_SIZE) {
        auto to_send = std::min(chunk.size(), DATA_SIZE - total_sent);
        auto sent = ::send(cli,
#ifdef _WIN32
                           static_cast<const char *>(chunk.c_str()),
                           static_cast<int>(to_send),
#else
                           chunk.c_str(), to_send,
#endif
                           0);
        if (sent <= 0) break;
        total_sent += static_cast<size_t>(sent);
      }

#ifdef _WIN32
      ::shutdown(cli, SD_SEND);
#else
      ::shutdown(cli, SHUT_WR);
#endif
      // Drain until the client closes its end, ensuring all data is delivered
      char drain[1024];
      while (::recv(cli, drain, sizeof(drain), 0) > 0) {}
      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  size_t total_read = 0;

  {
    Client cli("127.0.0.1", PORT + 2);
    cli.set_read_timeout(5, 0);
    cli.set_payload_max_length(0); // 0 means no limit

    auto stream = cli.open_stream("GET", "/data");
    ASSERT_TRUE(stream.is_valid());

    char buffer[64 * 1024];
    ssize_t n;

    while ((n = stream.read(buffer, sizeof(buffer))) > 0) {
      total_read += static_cast<size_t>(n);
    }
  }

  server_thread.join();

  EXPECT_EQ(total_read, DATA_SIZE)
      << "With payload_max_length(0), the client should read all " << DATA_SIZE
      << " bytes without truncation, but only read " << total_read << " bytes.";
}

// Regression test for OSS-Fuzz issue 508342856: a malicious server sending an
// enormous Content-Length must not cause the client to pre-allocate a huge
// response body buffer. The reservation is capped at payload_max_length_, and
// the read itself fails when the body exceeds the limit.
TEST(ClientVulnerabilityTest, HugeContentLengthDoesNotPreallocate) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto server_thread = std::thread([] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      char buf[4096];
      ::recv(cli, buf, sizeof(buf), 0);

      // Malicious response: claim a 20GB body but send only a tiny payload.
      std::string response = "HTTP/1.1 200 OK\r\n"
                             "Content-Length: 20000000000\r\n"
                             "\r\n"
                             "abc";
      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response.c_str()),
             static_cast<int>(response.size()),
#else
             response.c_str(), response.size(),
#endif
             0);

      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  {
    Client cli("127.0.0.1", PORT + 2);
    cli.set_read_timeout(5, 0);
    // Default payload_max_length_ is 100MB; a 20GB Content-Length must not
    // result in a 20GB pre-allocation. The Get() call is expected to fail
    // (server claims more bytes than payload_max_length permits), but it must
    // not exhaust memory before getting there.
    auto res = cli.Get("/malicious");
    EXPECT_FALSE(res); // Read fails because body exceeds payload_max_length_
  }

  server_thread.join();
}

// Verify that content_receiver bypasses the default payload_max_length,
// allowing streaming downloads larger than 100MB without requiring an explicit
// set_payload_max_length call.
TEST(ClientVulnerabilityTest, ContentReceiverBypassesDefaultPayloadMaxLength) {
  static constexpr size_t DATA_SIZE = 200 * 1024 * 1024; // 200MB from server

#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto server_thread = std::thread([] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      char buf[4096];
      ::recv(cli, buf, sizeof(buf), 0);

      // Response with Content-Length larger than default 100MB limit
      auto content_length = std::to_string(DATA_SIZE);
      std::string response_header = "HTTP/1.1 200 OK\r\n"
                                    "Content-Length: " +
                                    content_length +
                                    "\r\n"
                                    "Connection: close\r\n"
                                    "\r\n";

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response_header.c_str()),
             static_cast<int>(response_header.size()),
#else
             response_header.c_str(), response_header.size(),
#endif
             0);

      std::string chunk(64 * 1024, 'A');
      size_t total_sent = 0;

      while (total_sent < DATA_SIZE) {
        auto to_send = std::min(chunk.size(), DATA_SIZE - total_sent);
        auto sent = ::send(cli,
#ifdef _WIN32
                           static_cast<const char *>(chunk.c_str()),
                           static_cast<int>(to_send),
#else
                           chunk.c_str(), to_send,
#endif
                           0);
        if (sent <= 0) break;
        total_sent += static_cast<size_t>(sent);
      }

      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  size_t total_received = 0;

  {
    Client cli("127.0.0.1", PORT + 2);
    cli.set_read_timeout(10, 0);
    // Do NOT call set_payload_max_length — use the default 100MB limit

    auto res =
        cli.Get("/large", [&](const char * /*data*/, size_t data_length) {
          total_received += data_length;
          return true;
        });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  server_thread.join();

  EXPECT_EQ(total_received, DATA_SIZE)
      << "With content_receiver, the client should read all " << DATA_SIZE
      << " bytes despite the default 100MB payload_max_length, but only read "
      << total_received << " bytes.";
}

// Verify that an explicit set_payload_max_length smaller than the response is
// enforced even when a content_receiver is used.
TEST(ClientVulnerabilityTest,
     ContentReceiverRespectsExplicitPayloadMaxLength150MB) {
  static constexpr size_t DATA_SIZE = 200 * 1024 * 1024; // 200MB from server
  static constexpr size_t EXPLICIT_LIMIT = 150 * 1024 * 1024; // 150MB limit

#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto server_thread = std::thread([] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      char buf[4096];
      ::recv(cli, buf, sizeof(buf), 0);

      auto content_length = std::to_string(DATA_SIZE);
      std::string response_header = "HTTP/1.1 200 OK\r\n"
                                    "Content-Length: " +
                                    content_length +
                                    "\r\n"
                                    "Connection: close\r\n"
                                    "\r\n";

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response_header.c_str()),
             static_cast<int>(response_header.size()),
#else
             response_header.c_str(), response_header.size(),
#endif
             0);

      std::string chunk(64 * 1024, 'A');
      size_t total_sent = 0;

      while (total_sent < DATA_SIZE) {
        auto to_send = std::min(chunk.size(), DATA_SIZE - total_sent);
        auto sent = ::send(cli,
#ifdef _WIN32
                           static_cast<const char *>(chunk.c_str()),
                           static_cast<int>(to_send),
#else
                           chunk.c_str(), to_send,
#endif
                           0);
        if (sent <= 0) break;
        total_sent += static_cast<size_t>(sent);
      }

      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  size_t total_received = 0;

  {
    Client cli("127.0.0.1", PORT + 2);
    cli.set_read_timeout(10, 0);
    cli.set_payload_max_length(EXPLICIT_LIMIT); // Explicit 150MB limit

    auto res =
        cli.Get("/large", [&](const char * /*data*/, size_t data_length) {
          total_received += data_length;
          return true;
        });

    // Should fail because 200MB exceeds the explicit 150MB limit
    EXPECT_FALSE(res);
  }

  server_thread.join();

  EXPECT_LE(total_received, EXPLICIT_LIMIT)
      << "Client with content_receiver should respect the explicit "
      << "payload_max_length of " << EXPLICIT_LIMIT << " bytes, but read "
      << total_received << " bytes.";
}

// Verify that an explicit set_payload_max_length larger than the response
// allows the content_receiver to read all data successfully.
TEST(ClientVulnerabilityTest,
     ContentReceiverRespectsExplicitPayloadMaxLength250MB) {
  static constexpr size_t DATA_SIZE = 200 * 1024 * 1024; // 200MB from server
  static constexpr size_t EXPLICIT_LIMIT = 250 * 1024 * 1024; // 250MB limit

#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  auto server_thread = std::thread([] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 2));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      char buf[4096];
      ::recv(cli, buf, sizeof(buf), 0);

      auto content_length = std::to_string(DATA_SIZE);
      std::string response_header = "HTTP/1.1 200 OK\r\n"
                                    "Content-Length: " +
                                    content_length +
                                    "\r\n"
                                    "Connection: close\r\n"
                                    "\r\n";

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response_header.c_str()),
             static_cast<int>(response_header.size()),
#else
             response_header.c_str(), response_header.size(),
#endif
             0);

      std::string chunk(64 * 1024, 'A');
      size_t total_sent = 0;

      while (total_sent < DATA_SIZE) {
        auto to_send = std::min(chunk.size(), DATA_SIZE - total_sent);
        auto sent = ::send(cli,
#ifdef _WIN32
                           static_cast<const char *>(chunk.c_str()),
                           static_cast<int>(to_send),
#else
                           chunk.c_str(), to_send,
#endif
                           0);
        if (sent <= 0) break;
        total_sent += static_cast<size_t>(sent);
      }

#ifdef _WIN32
      ::shutdown(cli, SD_SEND);
#else
      ::shutdown(cli, SHUT_WR);
#endif
      char drain[1024];
      while (::recv(cli, drain, sizeof(drain), 0) > 0) {}
      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  size_t total_received = 0;

  {
    Client cli("127.0.0.1", PORT + 2);
    cli.set_read_timeout(10, 0);
    cli.set_payload_max_length(EXPLICIT_LIMIT); // Explicit 250MB limit

    auto res =
        cli.Get("/large", [&](const char * /*data*/, size_t data_length) {
          total_received += data_length;
          return true;
        });

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }

  server_thread.join();

  EXPECT_EQ(total_received, DATA_SIZE)
      << "With explicit payload_max_length of " << EXPLICIT_LIMIT
      << " bytes (larger than " << DATA_SIZE
      << " bytes response), content_receiver should read all data, but only "
         "read "
      << total_received << " bytes.";
}

#if defined(CPPHTTPLIB_ZLIB_SUPPORT) && !defined(_WIN32)
// Regression test for "zip bomb" attack on the client side: a malicious server
// sends a small gzip-compressed response that decompresses to a huge payload.
// The client must enforce payload_max_length on the decompressed size.
TEST(ClientVulnerabilityTest, ZipBombWithoutContentLength) {
  constexpr size_t DECOMPRESSED_SIZE =
      10 * 1024 * 1024; // 10MB after decompression
  constexpr size_t CLIENT_READ_LIMIT = 2 * 1024 * 1024; // 2MB safety limit

  // Prepare gzip-compressed data: 10MB of zeros compresses to a few KB
  std::string uncompressed(DECOMPRESSED_SIZE, '\0');
  std::string compressed;
  {
    httplib::detail::gzip_compressor compressor;
    bool ok =
        compressor.compress(uncompressed.data(), uncompressed.size(),
                            /*last=*/true, [&](const char *buf, size_t len) {
                              compressed.append(buf, len);
                              return true;
                            });
    ASSERT_TRUE(ok);
  }
  // Sanity: compressed data should be much smaller than the decompressed size
  ASSERT_LT(compressed.size(), DECOMPRESSED_SIZE / 10);

#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  // Set up the listening socket in the main thread so the server is guaranteed
  // to be ready before the client connects (eliminates race condition).
  auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
  default_socket_options(srv);
  detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
  detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(PORT + 3));
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

  int opt = 1;
  ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
               reinterpret_cast<const char *>(&opt),
#else
               &opt,
#endif
               sizeof(opt));

  ASSERT_EQ(0, ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
  ASSERT_EQ(0, ::listen(srv, 1));

  auto server_thread = std::thread([&compressed, srv] {
    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      // Read the full HTTP request (until \r\n\r\n)
      char buf[4096];
      size_t total = 0;
      while (total < sizeof(buf)) {
        auto n = ::recv(cli, buf + total, sizeof(buf) - total, 0);
        if (n <= 0) break;
        total += static_cast<size_t>(n);
        // Check for end of headers
        if (total >= 4) {
          std::string req(buf, total);
          if (req.find("\r\n\r\n") != std::string::npos) break;
        }
      }

      // Malicious response: gzip-compressed body, no Content-Length
      std::string response_header = "HTTP/1.1 200 OK\r\n"
                                    "Content-Encoding: gzip\r\n"
                                    "Connection: close\r\n"
                                    "\r\n";

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response_header.c_str()),
             static_cast<int>(response_header.size()),
#else
             response_header.c_str(), response_header.size(),
#endif
             0);

      // Send the compressed payload (small on the wire, huge when decompressed)
      size_t total_sent = 0;
      while (total_sent < compressed.size()) {
        auto to_send = std::min(compressed.size() - total_sent,
                                static_cast<size_t>(64 * 1024));
        auto sent =
            ::send(cli,
#ifdef _WIN32
                   static_cast<const char *>(compressed.c_str() + total_sent),
                   static_cast<int>(to_send),
#else
                   compressed.c_str() + total_sent, to_send,
#endif
                   0);
        if (sent <= 0) break;
        total_sent += static_cast<size_t>(sent);
      }

      detail::close_socket(cli);
    }
  });

  auto se = detail::scope_exit([&] {
    detail::close_socket(srv);
    server_thread.join();
  });

  size_t total_decompressed = 0;

  {
    Client cli("127.0.0.1", PORT + 3);
    cli.set_read_timeout(5, 0);
    cli.set_decompress(true);
    cli.set_payload_max_length(CLIENT_READ_LIMIT);

    auto stream = cli.open_stream("GET", "/zipbomb");
    ASSERT_TRUE(stream.is_valid());

    char buffer[64 * 1024];
    ssize_t n;

    while ((n = stream.read(buffer, sizeof(buffer))) > 0) {
      total_decompressed += static_cast<size_t>(n);
    }
  }

  // The decompressed size must be capped by payload_max_length. Without
  // protection, the client would decompress the full 10MB from a tiny
  // compressed payload, enabling a zip bomb DoS attack.
  EXPECT_LE(total_decompressed, CLIENT_READ_LIMIT)
      << "Client decompressed " << total_decompressed
      << " bytes from a gzip response. The decompressed size should be "
      << "limited by set_payload_max_length to prevent zip bomb attacks.";
}
#endif

TEST(HostAndPortPropertiesTest, NoSSL) {
  httplib::Client cli("www.google.com", 1234);
  ASSERT_EQ("www.google.com", cli.host());
  ASSERT_EQ(1234, cli.port());
}

TEST(HostAndPortPropertiesTest, NoSSLWithSimpleAPI) {
  httplib::Client cli("www.google.com:1234");
  ASSERT_EQ("www.google.com", cli.host());
  ASSERT_EQ(1234, cli.port());
}

TEST(HostAndPortPropertiesTest, OverflowPortNumber) {
  // Port number that overflows int — should not crash, client becomes invalid
  httplib::Client cli("http://www.google.com:99999999999999999999");
  ASSERT_FALSE(cli.is_valid());
}

TEST(HostAndPortPropertiesTest, PortOutOfRange) {
  // Port 99999 exceeds valid range (1-65535) — should not crash
  httplib::Client cli("http://www.google.com:99999");
  ASSERT_FALSE(cli.is_valid());

  auto res = cli.Get("/");
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::Connection, res.error());
}

TEST(HostAndPortPropertiesTest, UserinfoIsNotSupported) {
  httplib::Client cli("http://user:pass@localhost:1234");
  ASSERT_FALSE(cli.is_valid());
  EXPECT_FALSE(cli.Get("/"));

  EXPECT_FALSE(httplib::Client("//user@localhost:1234").is_valid());
}

TEST(HostAndPortPropertiesTest, TrailingCharactersInPort) {
  httplib::Client cli("http://www.google.com:80abc");
  ASSERT_FALSE(cli.is_valid());
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(HostAndPortPropertiesTest, SSL) {
  httplib::SSLClient cli("www.google.com");
  ASSERT_EQ("www.google.com", cli.host());
  ASSERT_EQ(443, cli.port());
}

TEST(SSLClientTest, UpdateCAStoreWithPem_Online) {
  // Test updating CA store multiple times using PEM-based load_ca_cert_store
  std::string cert;
  read_file(CA_CERT_FILE, cert);

  httplib::SSLClient httplib_client("www.google.com");

  // Load CA store first time
  httplib_client.load_ca_cert_store(cert.data(), cert.size());

  // Load CA store second time (update)
  httplib_client.load_ca_cert_store(cert.data(), cert.size());

  // Verify client is still valid and can make connections
  httplib_client.enable_server_certificate_verification(true);
  auto res = httplib_client.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  // Google may return 200 or 301 depending on various factors
  EXPECT_TRUE(res->status == StatusCode::OK_200 ||
              res->status == StatusCode::MovedPermanently_301);
}

TEST(SSLClientTest, ServerNameIndication_Online) {
  auto host = "httpbingo.org";
  auto path = std::string{"/get"};

  SSLClient cli(host, 443);
  auto res = cli.Get(path);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientTest, ServerCertificateVerificationError_Online) {
  // Use a site that will cause SSL verification failure due to self-signed cert
  SSLClient cli("self-signed.badssl.com", 443);
  cli.enable_server_certificate_verification(true);
  auto res = cli.Get("/");

  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());

  // Verify backend error is captured for SSLServerVerification
  // This occurs when certificate verification fails
  // OpenSSL: X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT (18)
  // Mbed TLS: MBEDTLS_X509_BADCERT_NOT_TRUSTED or similar flags
  EXPECT_NE(0UL, res.ssl_backend_error());
  EXPECT_EQ(static_cast<int>(tls::ErrorCode::CertVerifyFailed),
            res.ssl_error());
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
#if !defined(_WIN32) ||                                                        \
    defined(CPPHTTPLIB_DISABLE_WINDOWS_AUTOMATIC_ROOT_CERTIFICATES_UPDATE)
  // On non-Windows or when Windows Schannel is disabled, the error comes
  // from OpenSSL's verification
  EXPECT_EQ(static_cast<unsigned long>(X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT),
            res.ssl_backend_error());
#endif
#endif
}

TEST(SSLClientTest, ServerHostnameVerificationError_Online) {
  // Use a site where hostname doesn't match the certificate
  // badssl.com provides wrong.host.badssl.com which has cert for *.badssl.com
  SSLClient cli("wrong.host.badssl.com", 443);
  cli.enable_server_certificate_verification(true);
  cli.enable_server_hostname_verification(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::SSLServerHostnameVerification, res.error());

  // Verify backend error is captured for hostname verification failure
  EXPECT_NE(0UL, res.ssl_backend_error());
  EXPECT_EQ(static_cast<int>(tls::ErrorCode::HostnameMismatch),
            res.ssl_error());
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
#if !defined(_WIN32) ||                                                        \
    defined(CPPHTTPLIB_DISABLE_WINDOWS_AUTOMATIC_ROOT_CERTIFICATES_UPDATE)
  // On non-Windows or when Windows Schannel is disabled, the error comes
  // from OpenSSL's hostname verification
  EXPECT_EQ(static_cast<unsigned long>(X509_V_ERR_HOSTNAME_MISMATCH),
            res.ssl_backend_error());
#endif
#endif
}

#if defined(_WIN32) && defined(CPPHTTPLIB_SSL_ENABLED) &&                      \
    !defined(CPPHTTPLIB_DISABLE_WINDOWS_AUTOMATIC_ROOT_CERTIFICATES_UPDATE)
TEST(SSLClientTest, WindowsCertificateVerification_DefaultEnabled) {
  SSLClient cli("www.google.com", 443);
  cli.enable_server_certificate_verification(true);

  auto res = cli.Get("/");
  if (res) { EXPECT_NE(StatusCode::InternalServerError_500, res->status); }
}

TEST(SSLClientTest, WindowsCertificateVerification_Disabled) {
  SSLClient cli("www.google.com", 443);
  cli.enable_server_certificate_verification(true);
  cli.enable_windows_certificate_verification(false);

  auto res = cli.Get("/");
  if (res) { EXPECT_NE(StatusCode::InternalServerError_500, res->status); }
}

// The server sends an intermediate cross-signed by a root Windows trusts,
// while the leaf's AIA URL leads to one under a root Windows does not trust.
TEST(SSLClientTest, WindowsCertificateVerification_ServerIntermediates_Online) {
  SSLClient cli("accounts.spotify.com", 443);
  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error())
                   << " ssl_backend_error=" << res.ssl_backend_error();
}

// Windows, not the backend, decides on the chain: the error is a CryptoAPI
// policy status, which no backend reports for a self-signed certificate.
TEST(SSLClientTest, WindowsCertificateVerification_RejectsUntrustedRoot) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
  EXPECT_EQ(static_cast<DWORD>(CERT_E_UNTRUSTEDROOT), res.ssl_backend_error());
}
#endif

TEST(SSLClientTest, ServerCertificateVerification1_Online) {
  Client cli("https://google.com");
  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

TEST(SSLClientTest, ServerCertificateVerification2_Online) {
  SSLClient cli("google.com");
  cli.set_ca_cert_path(CA_CERT_FILE);
  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

TEST(SSLClientTest, ServerCertificateVerification3_Online) {
  SSLClient cli("google.com");
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path("hello");

  auto res = cli.Get("/");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::SSLLoadingCerts, res.error());

  // For SSL_CTX operations, ssl_error should be 0, only ssl_backend_error
  // should be set
  EXPECT_EQ(0, res.ssl_error());

  // Verify backend error is captured for SSLLoadingCerts
  // This error occurs when loading CA certificates fails
  EXPECT_NE(0UL, res.ssl_backend_error());
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
  // OpenSSL specific error codes:
  // > openssl errstr 0x80000002
  // error:80000002:system library::No such file or directory
  // > openssl errstr 0xA000126
  // error:0A000126:SSL routines::unexpected eof while reading
  EXPECT_TRUE(res.ssl_backend_error() == 0x80000002 ||
              res.ssl_backend_error() == 0xA000126);
#endif
}

TEST(SSLClientTest, ServerCertificateVerification4) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
    svr.stop();
    ASSERT_TRUE(true);
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  auto se = detail::scope_exit([&] {
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  cli.set_ca_cert_path(SERVER_CERT2_FILE);
  cli.enable_server_certificate_verification(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientTest, ServerCertificateVerification5_Online) {
  std::string cert;
  read_file(CA_CERT_FILE, cert);

  SSLClient cli("google.com");
  cli.load_ca_cert_store(cert.data(), cert.size());
  const auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

TEST(SSLClientTest, ServerCertificateVerification6_Online) {
  // clang-format off
  static constexpr char cert[] =
    "GlobalSign Root CA\n"
    "==================\n"
    "-----BEGIN CERTIFICATE-----\n"
    "MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkGA1UEBhMCQkUx\n"
    "GTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jvb3QgQ0ExGzAZBgNVBAMTEkds\n"
    "b2JhbFNpZ24gUm9vdCBDQTAeFw05ODA5MDExMjAwMDBaFw0yODAxMjgxMjAwMDBaMFcxCzAJBgNV\n"
    "BAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMRAwDgYDVQQLEwdSb290IENBMRswGQYD\n"
    "VQQDExJHbG9iYWxTaWduIFJvb3QgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDa\n"
    "DuaZjc6j40+Kfvvxi4Mla+pIH/EqsLmVEQS98GPR4mdmzxzdzxtIK+6NiY6arymAZavpxy0Sy6sc\n"
    "THAHoT0KMM0VjU/43dSMUBUc71DuxC73/OlS8pF94G3VNTCOXkNz8kHp1Wrjsok6Vjk4bwY8iGlb\n"
    "Kk3Fp1S4bInMm/k8yuX9ifUSPJJ4ltbcdG6TRGHRjcdGsnUOhugZitVtbNV4FpWi6cgKOOvyJBNP\n"
    "c1STE4U6G7weNLWLBYy5d4ux2x8gkasJU26Qzns3dLlwR5EiUWMWea6xrkEmCMgZK9FGqkjWZCrX\n"
    "gzT/LCrBbBlDSgeF59N89iFo7+ryUp9/k5DPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNV\n"
    "HRMBAf8EBTADAQH/MB0GA1UdDgQWBBRge2YaRQ2XyolQL30EzTSo//z9SzANBgkqhkiG9w0BAQUF\n"
    "AAOCAQEA1nPnfE920I2/7LqivjTFKDK1fPxsnCwrvQmeU79rXqoRSLblCKOzyj1hTdNGCbM+w6Dj\n"
    "Y1Ub8rrvrTnhQ7k4o+YviiY776BQVvnGCv04zcQLcFGUl5gE38NflNUVyRRBnMRddWQVDf9VMOyG\n"
    "j/8N7yy5Y0b2qvzfvGn9LhJIZJrglfCm7ymPAbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhH\n"
    "hm4qxFYxldBniYUr+WymXUadDKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveC\n"
    "X4XSQRjbgbMEHMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==\n"
    "-----END CERTIFICATE-----\n";
  // clang-format on

  SSLClient cli("google.com");
  cli.load_ca_cert_store(cert, sizeof(cert));
  const auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

TEST(SSLClientTest, WildcardHostNameMatch_Online) {
  SSLClient cli("www.youtube.com");

  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.enable_server_certificate_verification(true);
  cli.set_follow_location(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientTest, WildcardHostNameMatchCase_Online) {
  SSLClient cli("wWw.YouTube.Com");

  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.enable_server_certificate_verification(true);
  cli.enable_server_hostname_verification(true);
  cli.set_follow_location(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientTest, HostNameMatchCase_Online) {
  SSLClient cli("gOoGlE.COm");

  cli.enable_server_certificate_verification(true);
  cli.enable_server_hostname_verification(true);
  cli.set_follow_location(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientTest, Issue2004_Online) {
  Client client("https://google.com");
  client.set_follow_location(true);

  auto res = client.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);

  auto body = res->body;
  EXPECT_EQ(body.substr(0, 15), "<!doctype html>");
}

TEST(SSLClientTest, ErrorReportingWhenInvalid) {
  // Create SSLClient with invalid cert/key to make is_valid() return false
  SSLClient cli("localhost", 8080, "nonexistent_cert.pem",
                "nonexistent_key.pem");

  // is_valid() should be false due to cert loading failure
  ASSERT_FALSE(cli.is_valid());

  auto res = cli.Get("/");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLConnection, res.error());
}

TEST(SSLClientTest, Issue2251_SwappedClientCertAndKey) {
  // Test for Issue #2251: SSL error not properly reported when client cert
  // and key paths are swapped or mismatched
  // This simulates the scenario where user accidentally swaps the cert and key
  // files

  // Using client cert file as private key and vice versa (completely wrong)
  SSLClient cli("localhost", 8080, "client.key.pem", "client.cert.pem");

  // Should fail validation due to cert/key mismatch
  ASSERT_FALSE(cli.is_valid());

  // Attempt to make a request should fail with proper error
  auto res = cli.Get("/");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLConnection, res.error());

  // SSL error should be recorded in the Result object (this is the key fix for
  // Issue #2251)
  auto backend_error = res.ssl_backend_error();
  EXPECT_NE(0u, backend_error);
}

// Tests cert/key mismatch detection at the TLS context level
TEST(TlsApiTest, ClientCertKeyMismatch) {
  // Test that using mismatched cert/key causes connection failure.
  // We verify this at the SSLClient level rather than through internal
  // TLS API functions.
  SSLClient cli(HOST, PORT, "client.cert.pem", "key.pem");
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(2);

  // The mismatch should cause a connection or handshake error
  auto res = cli.Get("/test");
  // OpenSSL detects mismatch at context setup, MbedTLS at handshake
  // Either way, the request should fail
  EXPECT_FALSE(res);
}
#endif

#if 0
TEST(SSLClientTest, SetInterfaceWithINET6) {
  auto cli = std::make_shared<httplib::Client>("https://httpcan.org");
  ASSERT_TRUE(cli != nullptr);

  cli->set_address_family(AF_INET6);
  cli->set_interface("en0");

  auto res = cli->Get("/get");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}
#endif

// Client certificate tests - work with all TLS backends
#ifdef CPPHTTPLIB_SSL_ENABLED
using ClientCertServerSetup = std::function<void(SSLServer &)>;

void ClientCertPresent(
    const std::string &client_cert_file,
    const std::string &client_private_key_file,
    const std::string &client_encrypted_private_key_pass = std::string(),
    const ClientCertServerSetup &setup = nullptr) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  if (setup) { setup(svr); }

  svr.Get("/test", [&](const Request &req, Response &res) {
    res.set_content("test", "text/plain");

    auto cert = req.peer_cert();
    ASSERT_TRUE(static_cast<bool>(cert));

    std::string common_name = cert.subject_cn();
    EXPECT_EQ("Common Name", common_name);
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_LT(0, port);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, port, client_cert_file, client_private_key_file,
                client_encrypted_private_key_pass);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientServerTest, ClientCertPresent) {
  ClientCertPresent(CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
}

TEST(SSLClientServerTest, ClientEncryptedCertPresent) {
  ClientCertPresent(CLIENT_ENCRYPTED_CERT_FILE,
                    CLIENT_ENCRYPTED_PRIVATE_KEY_FILE,
                    CLIENT_ENCRYPTED_PRIVATE_KEY_PASS);
}

// Expects svr, which must require client certificates, to reject a client
// that has none
void RejectsClientWithoutCert(SSLServer &svr) {
  svr.Get("/test", [](const Request &, Response &) { FAIL(); });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_LT(0, port);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, port);
  cli.set_connection_timeout(30);
  // Skip the server certificate check, so that the request fails because the
  // client certificate is missing rather than because cert.pem is not trusted
  cli.enable_server_certificate_verification(false);

  auto res = cli.Get("/test");
  ASSERT_FALSE(res);
  // The server rejects the client during the handshake, or on TLS 1.3 right
  // after it, which the client notices on its first write or read
  EXPECT_TRUE(res.error() == Error::SSLConnection ||
              res.error() == Error::Write || res.error() == Error::Read)
      << to_string(res.error());

  if (res.error() == Error::SSLConnection) {
    EXPECT_NE(0UL, res.ssl_backend_error());
  }
  // A rejection noticed on the write keeps the TLS error the write hit
  if (res.error() == Error::Write) { EXPECT_NE(0, res.ssl_error()); }
}

void ClientCertMissing(const ClientCertServerSetup &setup = nullptr) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());
  if (setup) { setup(svr); }
  RejectsClientWithoutCert(svr);
}

TEST(SSLClientServerTest, ClientCertMissing) { ClientCertMissing(); }

// A server that requires client certificates must keep requiring them after
// setup changes it, and keep accepting a client that has one
void ClientCertStillRequired(const ClientCertServerSetup &setup) {
  ClientCertMissing(setup);
  ClientCertPresent(CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE, std::string(),
                    setup);
}

TEST(SSLClientServerTest, ClientCertStillRequiredAfterVerifyCallbackSet) {
  ClientCertStillRequired([](SSLServer &svr) {
    ASSERT_TRUE(tls::set_verify_callback(
        svr.tls_context(), [](const tls::VerifyContext &) { return true; }));
  });
}

TEST(SSLClientServerTest, ClientCertStillRequiredAfterVerifyCallbackCleared) {
  ClientCertStillRequired([](SSLServer &svr) {
    ASSERT_TRUE(tls::set_verify_callback(
        svr.tls_context(), [](const tls::VerifyContext &) { return true; }));
    ASSERT_TRUE(tls::set_verify_callback(svr.tls_context(), nullptr));
  });
}

// The client verifies the server certificate during the handshake, so a
// server that fails the check never gets the client certificate, even when a
// verifier of the client's own accepts it
TEST(SSLClientServerTest, ClientCertNotSentToUnverifiedServer) {
  struct Case {
    const char *trusted_ca;
    const char *host;
    Error error;
  };
  // cert2.pem names localhost: the first client does not trust it, and the
  // second trusts it but asks for another name
  for (const auto &c :
       {Case{CLIENT_CA_CERT_FILE, "localhost", Error::SSLServerVerification},
        Case{SERVER_CERT2_FILE, "example.com",
             Error::SSLServerHostnameVerification}}) {
    for (auto with_verifier : {false, true}) {
      SCOPED_TRACE(std::string(c.host) + (with_verifier ? " +verifier" : ""));
      SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE,
                    CLIENT_CA_CERT_FILE);
      ASSERT_TRUE(svr.is_valid());
      std::atomic<bool> got_client_cert{false};
      ASSERT_TRUE(tls::set_verify_callback(svr.tls_context(),
                                           [&](const tls::VerifyContext &) {
                                             got_client_cert = true;
                                             return true;
                                           }));
      auto port = svr.bind_to_any_port("127.0.0.1");
      ASSERT_LT(0, port);
      thread t = thread([&] { svr.listen_after_bind(); });
      svr.wait_until_ready();

      SSLClient cli(c.host, port, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
      cli.set_hostname_addr_map({{c.host, "127.0.0.1"}});
      cli.set_ca_cert_path(c.trusted_ca);
      if (with_verifier) {
        cli.set_server_certificate_verifier(
            [](const tls::VerifyContext &) { return true; });
      }
      auto res = cli.Get("/");
      EXPECT_FALSE(res);
      EXPECT_EQ(c.error, res.error());

      svr.stop();
      t.join();
      EXPECT_FALSE(got_client_cert);
    }
  }
}

void UpdateCertsPemWithClientCA(SSLServer &svr) {
  std::string cert_pem, key_pem, ca_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);
  read_file(CLIENT_CA_CERT_FILE, ca_pem);
  ASSERT_TRUE(
      svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str(), ca_pem.c_str()));
}

TEST(SSLClientServerTest, UpdateCertsPemWithClientCARequiresClientCert) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  UpdateCertsPemWithClientCA(svr);
  RejectsClientWithoutCert(svr);
}

TEST(SSLClientServerTest, ClientCertStillRequiredAfterUpdateCertsPem) {
  ClientCertStillRequired(UpdateCertsPemWithClientCA);
}

// A TLS error from one request must not show up in a later request's Result
TEST(SSLClientServerTest, SSLErrorNotCarriedToLaterRequest) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_LT(0, port);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, port);
  cli.set_connection_timeout(30);
  cli.enable_server_hostname_verification(false);

  // cert.pem is not trusted, so the handshake fails
  ASSERT_FALSE(cli.Get("/test"));

  cli.enable_server_certificate_verification(false);
  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, res.ssl_error());
  EXPECT_EQ(0UL, res.ssl_backend_error());
}

// PEM memory-based constructor tests (works with all TLS backends).
// exact_size passes each PEM in a buffer of its own size, with no NUL
// terminator after it.
void PemMemoryClientCertPresent(
    const std::string &client_cert_file,
    const std::string &client_private_key_file,
    const std::string &client_encrypted_private_key_pass = std::string(),
    bool exact_size = false) {
  // Read PEM files into memory
  std::string server_cert_pem, server_key_pem;
  std::string client_ca_pem;
  std::string client_cert_pem, client_key_pem;

  read_file(SERVER_CERT_FILE, server_cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, server_key_pem);
  read_file(CLIENT_CA_CERT_FILE, client_ca_pem);
  read_file(client_cert_file, client_cert_pem);
  read_file(client_private_key_file, client_key_pem);

  std::list<std::vector<char>> exact_copies;
  auto data = [&](const std::string &pem) -> const char * {
    if (!exact_size) { return pem.c_str(); }
    exact_copies.emplace_back(pem.begin(), pem.end());
    return exact_copies.back().data();
  };

  // Create server with PEM memory
  SSLServer::PemMemory server_pem = {
      data(server_cert_pem),
      server_cert_pem.size(),
      data(server_key_pem),
      server_key_pem.size(),
      data(client_ca_pem),
      client_ca_pem.size(),
      nullptr // no password for server key
  };
  SSLServer svr(server_pem);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [&](const Request &req, Response &res) {
    res.set_content("test", "text/plain");

    auto cert = req.peer_cert();
    ASSERT_TRUE(static_cast<bool>(cert));
    EXPECT_EQ("Common Name", cert.subject_cn());
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Create client with PEM memory
  const char *password = client_encrypted_private_key_pass.empty()
                             ? nullptr
                             : client_encrypted_private_key_pass.c_str();
  SSLClient::PemMemory client_pem = {
      data(client_cert_pem), client_cert_pem.size(), data(client_key_pem),
      client_key_pem.size(), password};
  SSLClient cli(HOST, PORT, client_pem);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientServerTest, PemMemoryClientCertPresent) {
  PemMemoryClientCertPresent(CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
}

TEST(SSLClientServerTest, PemMemoryClientEncryptedCertPresent) {
  PemMemoryClientCertPresent(CLIENT_ENCRYPTED_CERT_FILE,
                             CLIENT_ENCRYPTED_PRIVATE_KEY_FILE,
                             CLIENT_ENCRYPTED_PRIVATE_KEY_PASS);
}

// A server built from PEM memory with a client CA requires client certificates,
// also when the CA is a NUL-terminated string passed with a length of 0
TEST(SSLClientServerTest, PemMemoryClientCertMissing) {
  std::string server_cert_pem, server_key_pem, client_ca_pem;
  read_file(SERVER_CERT_FILE, server_cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, server_key_pem);
  read_file(CLIENT_CA_CERT_FILE, client_ca_pem);

  SSLServer::PemMemory server_pem = {
      server_cert_pem.c_str(),
      server_cert_pem.size(),
      server_key_pem.c_str(),
      server_key_pem.size(),
      client_ca_pem.c_str(),
      client_ca_pem.size(),
      nullptr // no password for server key
  };
  for (auto client_ca_pem_len : {client_ca_pem.size(), size_t{0}}) {
    SCOPED_TRACE(client_ca_pem_len);
    server_pem.client_ca_pem_len = client_ca_pem_len;
    SSLServer svr(server_pem);
    ASSERT_TRUE(svr.is_valid());
    RejectsClientWithoutCert(svr);
  }

  // An empty CA fails to load instead of turning the check off
  server_pem.client_ca_pem = "";
  server_pem.client_ca_pem_len = 0;
  EXPECT_FALSE(SSLServer(server_pem).is_valid());
}

// The PemMemory lengths are honoured, so the PEM needs no NUL terminator
TEST(SSLClientServerTest, PemMemoryExactSizeBuffers) {
  PemMemoryClientCertPresent(CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE, "",
                             true);
}

// A length shorter than the PEM cuts it short, so it no longer loads
TEST(SSLClientServerTest, PemMemoryShortLengthCutsThePem) {
  std::string cert, key;
  read_file(SERVER_CERT_FILE, cert);
  read_file(SERVER_PRIVATE_KEY_FILE, key);

  for (auto cut_cert : {true, false}) {
    auto cert_len = cut_cert ? cert.size() / 2 : cert.size();
    auto key_len = cut_cert ? key.size() : key.size() / 2;

    SSLServer::PemMemory server_pem = {
        cert.c_str(), cert_len, key.c_str(), key_len, nullptr, 0, nullptr};
    EXPECT_FALSE(SSLServer(server_pem).is_valid());

    SSLClient::PemMemory client_pem = {cert.c_str(), cert_len, key.c_str(),
                                       key_len, nullptr};
    EXPECT_FALSE(SSLClient(HOST, PORT, client_pem).is_valid());

    ws::WebSocketClient::PemMemory ws_pem = {cert.c_str(), cert_len,
                                             key.c_str(), key_len, nullptr};
    EXPECT_FALSE(ws::WebSocketClient("wss://localhost/", ws_pem).is_valid());
  }
}

TEST(SSLClientServerTest, SSLConnectTimeout) {
  class NoListenSSLServer : public SSLServer {
  public:
    NoListenSSLServer(const char *cert_path, const char *private_key_path,
                      const char *client_ca_cert_file_path,
                      const char *client_ca_cert_dir_path = nullptr)
        : SSLServer(cert_path, private_key_path, client_ca_cert_file_path,
                    client_ca_cert_dir_path),
          stop_(false) {}

    std::atomic_bool stop_;

  private:
    bool process_and_close_socket(socket_t /*sock*/) override {
      // Don't create SSL context
      while (!stop_.load()) {
        std::this_thread::sleep_for(std::chrono::milliseconds(100));
      }
      return true;
    }
  };
  NoListenSSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE,
                        CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop_ = true;
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(1);

  auto res = cli.Get("/test");
  ASSERT_TRUE(!res);
  EXPECT_EQ(Error::SSLConnection, res.error());
  // Timeout results in WantRead error code (maps to backend-specific value)
  EXPECT_NE(0, res.ssl_error());
}

TEST(SSLClientServerTest, CustomizeServerSSLCtxGeneric) {
  // Test SSLServer with client certificate verification using the standard
  // constructor (ContextSetupCallback is tested by backend-specific tests)
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE,
                CLIENT_CA_CERT_DIR);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [&](const Request &req, Response &res) {
    res.set_content("test", "text/plain");

    auto cert = req.peer_cert();
    ASSERT_TRUE(static_cast<bool>(cert));

    auto common_name = cert.subject_cn();
    EXPECT_EQ("Common Name", common_name);
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

// Test verify_hostname on every backend: a host is named by a SAN only
TEST(SSLClientServerTest, TlsVerifyHostname) {
  using namespace httplib::tls;

  // We need a running server to test against
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  bool verify_callback_called = false;
  bool verify_result_wrong = false;

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.set_connection_timeout(5);

  // Note: Test certificate has CN="Common Name", not "localhost"
  bool verify_result_cn = false;
  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    verify_callback_called = true;

    if (!ctx.cert) return false;

    // Test 1: "Common Name" is the CN of our test server cert, which has no SAN
    verify_result_cn = ctx.check_hostname("Common Name");

    // Test 2: wrong hostname should not match
    verify_result_wrong = ctx.check_hostname("wronghost.example.com");

    return true; // Accept for the purpose of this test
  });

  auto res = cli.Get("/test");
  // The request may succeed or fail depending on cert configuration
  // but the callback should have been called

  ASSERT_TRUE(verify_callback_called)
      << "Verify callback should have been called";

  EXPECT_FALSE(verify_result_cn)
      << "verify_hostname must not match the certificate CN (no SAN)";

  // Wrong hostname should not match
  EXPECT_FALSE(verify_result_wrong)
      << "verify_hostname should not match 'wronghost.example.com'";
}

// A DNS name in the CN must not authenticate a host (RFC 9525), whichever
// backend verifies it.
TEST(SSLClientServerTest, TlsVerifyHostnameDnsNotMatchedByCommonName) {
  // Certificate CN is "localhost" and it carries no SAN.
  SSLServer svr(SERVER_CERT_DNS_CN_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  SSLClient cli("localhost", port);
  cli.set_ca_cert_path(SERVER_CERT_DNS_CN_FILE);
  cli.enable_server_certificate_verification(true);
  cli.set_connection_timeout(5);

  auto res = cli.Get("/test");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerHostnameVerification, res.error());

  // The same certificate is accepted once host name verification is off, so the
  // failure above is the host name and not the chain.
  cli.enable_server_hostname_verification(false);
  res = cli.Get("/test");
  ASSERT_TRUE(res) << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

// An IP-literal host must only be authenticated via an iPAddress SAN, never via
// the certificate's Common Name (RFC 9110). This mirrors the OpenSSL backend's
// X509_check_ip behavior and must hold for every backend.
TEST(SSLClientServerTest, TlsVerifyHostnameIpNotMatchedByCommonName) {
  using namespace httplib::tls;

  // Certificate CN is the IPv4 literal "127.0.0.1" and it carries no SAN.
  SSLServer svr(SERVER_CERT_IP_CN_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  bool verify_callback_called = false;
  bool ip_matched_via_cn = true;

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.set_connection_timeout(5);

  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    verify_callback_called = true;
    if (!ctx.cert) return false;

    // The IP appears only in the CN, so it must NOT be accepted.
    ip_matched_via_cn = ctx.check_hostname("127.0.0.1");

    return true; // Accept for the purpose of this test
  });

  cli.Get("/test");

  ASSERT_TRUE(verify_callback_called)
      << "Verify callback should have been called";
  EXPECT_FALSE(ip_matched_via_cn)
      << "An IP host must not be authenticated via the certificate CN";
}

// IPv6 hosts must be matched against IPv6 iPAddress SANs (and only those).
TEST(SSLClientServerTest, TlsVerifyHostnameIpv6San) {
  using namespace httplib::tls;

  // Certificate CN is "::1" and it carries an IPv6 SAN for "2001:db8::1".
  SSLServer svr(SERVER_CERT_IPV6_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  bool verify_callback_called = false;
  bool san_matched = false;
  bool wrong_ipv6_matched = true;
  bool cn_ipv6_matched = true;

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.set_connection_timeout(5);

  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    verify_callback_called = true;
    if (!ctx.cert) return false;

    // Matches the IPv6 iPAddress SAN.
    san_matched = ctx.check_hostname("2001:db8::1");
    // A different IPv6 address must not match.
    wrong_ipv6_matched = ctx.check_hostname("2001:db8::2");
    // "::1" lives only in the CN, so it must not be accepted.
    cn_ipv6_matched = ctx.check_hostname("::1");

    return true; // Accept for the purpose of this test
  });

  cli.Get("/test");

  ASSERT_TRUE(verify_callback_called)
      << "Verify callback should have been called";
  EXPECT_TRUE(san_matched)
      << "verify_hostname should match an IPv6 iPAddress SAN";
  EXPECT_FALSE(wrong_ipv6_matched)
      << "verify_hostname should not match a non-matching IPv6 address";
  EXPECT_FALSE(cn_ipv6_matched)
      << "An IPv6 host must not be authenticated via the certificate CN";
}

// A SAN entry must only match a host of its own type: the bytes of the dNSName
// "a.zz" are also 97.46.122.122, and 42.46.122.122 reads as "*.zz".
TEST(SSLClientServerTest, TlsVerifyHostnameSanType) {
  using namespace httplib::tls;

  // SANs: DNS:a.zz, IP:42.46.122.122
  SSLServer svr(SERVER_CERT_SAN_TYPES_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  bool verify_callback_called = false;
  bool dns_san_matched = false;
  bool ip_san_matched = false;
  bool ip_matched_via_dns_san = true;
  bool dns_matched_via_ip_san = true;
  bool cn_matched_next_to_dns_san = true;

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.set_connection_timeout(5);

  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    verify_callback_called = true;
    if (!ctx.cert) return false;

    dns_san_matched = ctx.check_hostname("a.zz");
    ip_san_matched = ctx.check_hostname("42.46.122.122");

    ip_matched_via_dns_san = ctx.check_hostname("97.46.122.122");
    dns_matched_via_ip_san = ctx.check_hostname("b.zz");
    cn_matched_next_to_dns_san = ctx.check_hostname("san-types");

    return true; // Accept for the purpose of this test
  });

  cli.Get("/test");

  ASSERT_TRUE(verify_callback_called)
      << "Verify callback should have been called";
  EXPECT_TRUE(dns_san_matched) << "verify_hostname should match a dNSName SAN";
  EXPECT_TRUE(ip_san_matched)
      << "verify_hostname should match an iPAddress SAN";
  EXPECT_FALSE(ip_matched_via_dns_san)
      << "An IP host must not be authenticated via a dNSName SAN";
  EXPECT_FALSE(dns_matched_via_ip_san)
      << "A DNS host must not be authenticated via an iPAddress SAN";
  EXPECT_FALSE(cn_matched_next_to_dns_san)
      << "The CN must not be consulted next to a dNSName SAN (RFC 6125)";
}

// RFC 6125 6.4.3: only the leftmost label of a dNSName may be a wildcard, so
// "www.*.example.test" names one host and not every host under example.test.
TEST(SSLClientServerTest, TlsVerifyHostnameWildcardLabel) {
  using namespace httplib::tls;

  // SANs: DNS:*.leftmost.example.test, DNS:www.*.example.test
  SSLServer svr(SERVER_CERT_WILDCARD_SAN_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  bool verify_callback_called = false;
  bool leftmost_wildcard_matched = false;
  bool wildcard_spanned_labels = true;
  bool inner_wildcard_matched = true;

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.set_connection_timeout(5);

  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    verify_callback_called = true;
    if (!ctx.cert) return false;

    leftmost_wildcard_matched = ctx.check_hostname("a.leftmost.example.test");

    wildcard_spanned_labels = ctx.check_hostname("a.b.leftmost.example.test");
    inner_wildcard_matched = ctx.check_hostname("www.evil.example.test");

    return true; // Accept for the purpose of this test
  });

  cli.Get("/test");

  ASSERT_TRUE(verify_callback_called)
      << "Verify callback should have been called";
  EXPECT_TRUE(leftmost_wildcard_matched)
      << "A leftmost wildcard should match a single label";
  EXPECT_FALSE(wildcard_spanned_labels)
      << "A wildcard label must not match more than one label";
  EXPECT_FALSE(inner_wildcard_matched)
      << "A wildcard outside the leftmost label must not be honoured";
}

// sans() must report each SAN entry under its own type.
TEST(SSLClientServerTest, TlsCertSansEntryTypes) {
  using namespace httplib::tls;

  // SANs: DNS:a.zz, IP:42.46.122.122
  SSLServer svr(SERVER_CERT_SAN_TYPES_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  bool verify_callback_called = false;
  std::vector<SanEntry> sans;

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(true);
  cli.set_ca_cert_path(CA_CERT_FILE);
  cli.set_connection_timeout(5);

  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    verify_callback_called = true;
    if (!ctx.cert) return false;

    sans = ctx.sans();

    return true; // Accept for the purpose of this test
  });

  cli.Get("/test");

  ASSERT_TRUE(verify_callback_called)
      << "Verify callback should have been called";

  auto has_san = [&](SanType type, const std::string &value) {
    return std::any_of(sans.begin(), sans.end(), [&](const SanEntry &san) {
      return san.type == type && san.value == value;
    });
  };

  EXPECT_TRUE(has_san(SanType::DNS, "a.zz"))
      << "sans() should report the dNSName SAN";
  EXPECT_TRUE(has_san(SanType::IP, "42.46.122.122"))
      << "sans() should report the iPAddress SAN";

  EXPECT_FALSE(has_san(SanType::IP, "97.46.122.122"))
      << "sans() must not report the dNSName SAN as an address";
  EXPECT_FALSE(has_san(SanType::DNS, "*.zz"))
      << "sans() must not report the iPAddress SAN as a DNS name";
}
#endif

// mbedTLS-specific callback constructor test
// Tests that the void* callback can customize TLS settings via MbedTlsContext

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(SSLClientServerTest, ClientCAListSentToClient) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());

  // Set up a handler to verify client certificate is present
  bool client_cert_verified = false;
  svr.Get("/test", [&](const Request & /*req*/, Response &res) {
    // Verify that client certificate was provided
    client_cert_verified = true;
    res.set_content("success", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Client with certificate
  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_TRUE(client_cert_verified);
  EXPECT_EQ("success", res->body);
}
#endif

// ClientCAListSetInContext uses get_peer_cert() - works with all TLS
// backends
#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(SSLClientServerTest, ClientCAListSetInContext) {
  using namespace httplib::tls;

  // Test that when client CA cert file is provided,
  // the server properly requests and validates client certificates

  // Create a server with client authentication
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());

  bool handler_called = false;
  svr.Get("/test", [&](const Request &req, Response &res) {
    handler_called = true;

    // Verify that a client certificate was provided
    auto cert = req.peer_cert();
    ASSERT_TRUE(static_cast<bool>(cert));

    // Get the issuer name
    std::string issuer_str = cert.issuer_name();
    ASSERT_FALSE(issuer_str.empty());

    // The client certificate should be issued by our test CA
    EXPECT_TRUE(issuer_str.find("Root CA Name") != std::string::npos);
    res.set_content("authenticated", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Connect with a client certificate issued by the CA
  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
  ASSERT_TRUE(handler_called);
  EXPECT_EQ("authenticated", res->body);
}

TEST(TlsCertIntrospectionTest, GetCertSANs) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  bool cert_checked = false;
  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    if (ctx.cert) {
      auto sans = ctx.sans();
      // Test certificate may or may not have SANs - just verify the API
      // works If SANs exist, verify the types are valid
      for (const auto &san : sans) {
        EXPECT_TRUE(san.type == SanType::DNS || san.type == SanType::IP ||
                    san.type == SanType::EMAIL || san.type == SanType::URI ||
                    san.type == SanType::OTHER);
        EXPECT_FALSE(san.value.empty());
      }
      cert_checked = true;
    }
    return true;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(cert_checked);
}

TEST(TlsCertIntrospectionTest, GetCertValidity) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  bool validity_checked = false;
  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    if (ctx.cert) {
      time_t not_before = 0, not_after = 0;
      bool result = ctx.validity(not_before, not_after);
      EXPECT_TRUE(result);
      // Verify that not_before < now < not_after for a valid cert
      time_t now = time(nullptr);
      EXPECT_LT(not_before, now);
      EXPECT_GT(not_after, now);
      validity_checked = true;
    }
    return true;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(validity_checked);
}

TEST(TlsCertIntrospectionTest, GetCertSerial) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  bool serial_checked = false;
  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    if (ctx.cert) {
      std::string serial = ctx.serial();
      EXPECT_FALSE(serial.empty());
      // Serial should be a hex string
      for (char c : serial) {
        EXPECT_TRUE((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') ||
                    (c >= 'a' && c <= 'f'));
      }
      serial_checked = true;
    }
    return true;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_TRUE(serial_checked);
}

TEST(SSLClientServerTest, ClientCAListLoadErrorRecorded) {
  // Test 1: Valid CA file - no error should be recorded
  {
    SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE,
                  CLIENT_CA_CERT_FILE);
    ASSERT_TRUE(svr.is_valid());

    // With valid setup, last_ssl_error should be 0
    EXPECT_EQ(0, svr.ssl_last_error());
  }

  // Test 2: Invalid CA file content
  // When SSL_load_client_CA_file fails, last_ssl_error_ should be set
  {
    // Create a temporary file with completely invalid content
    const char *temp_invalid_ca = "./temp_invalid_ca_for_test.txt";
    {
      std::ofstream ofs(temp_invalid_ca);
      ofs << "This is not a certificate file at all\n";
      ofs << "Just plain text content\n";
    }

    // Create server with invalid CA file
    SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, temp_invalid_ca);

    // Clean up temporary file
    std::remove(temp_invalid_ca);

    // When there's an SSL error (from either SSL_CTX_load_verify_locations
    // or SSL_load_client_CA_file), last_ssl_error_ should be non-zero
    // Note: SSL_CTX_load_verify_locations typically fails first,
    // but our error handling code path is still exercised
    if (!svr.is_valid()) { EXPECT_NE(0, svr.ssl_last_error()); }
  }
}

TEST(VerifyCallbackTest, VerifyContextFields) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  int callback_count = 0;
  bool saw_leaf_cert = false;

  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) -> bool {
    if (ctx.cert) {
      callback_count++;
      // We should see at least one certificate (the leaf)
      std::string cn = ctx.subject_cn();
      if (!cn.empty()) { saw_leaf_cert = true; }
      // Verify context fields are populated
      EXPECT_NE(ctx.session, nullptr);
      EXPECT_GE(ctx.depth, 0);
    }
    return true;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GT(callback_count, 0);
  EXPECT_TRUE(saw_leaf_cert);
}

// A verifier that accepts runs alongside the built-in verification, and is the
// only check once that is turned off.
TEST(VerifyCallbackTest, AcceptingVerifierDoesNotOverrideVerification) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  SSLClient cli(HOST, port);
  cli.enable_server_hostname_verification(false);
  auto calls = 0;
  cli.set_server_certificate_verifier([&](const VerifyContext &) {
    calls++;
    return true;
  });

  // cert.pem is not trusted
  auto res = cli.Get("/test");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
  EXPECT_GT(calls, 0);

  cli.enable_server_certificate_verification(false);
  res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("ok", res->body);
}

// A verifier belongs to the client that set it, not to the thread that set it.
TEST(VerifyCallbackTest, VerifierStaysWithItsClient) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto rejecting_calls = 0;
  SSLClient rejecting(HOST, port);
  rejecting.enable_server_certificate_verification(false);
  rejecting.set_server_certificate_verifier([&](const VerifyContext &) {
    rejecting_calls++;
    return false;
  });

  auto accepting_calls = 0;
  SSLClient accepting(HOST, port);
  accepting.enable_server_certificate_verification(false);
  // Set on another thread than the requests below.
  thread([&]() {
    accepting.set_server_certificate_verifier([&](const VerifyContext &) {
      accepting_calls++;
      return true;
    });
  }).join();

  // Requested on another thread than the verifier was set on.
  thread([&]() { EXPECT_FALSE(rejecting.Get("/test")); }).join();
  EXPECT_GT(rejecting_calls, 0);

  auto res = accepting.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GT(accepting_calls, 0);
}

// A verifier replaced while a handshake runs it lives until it returns.
TEST(VerifyCallbackTest, VerifierReplacedDuringHandshake) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(false);

  std::promise<void> entered;
  std::promise<void> replaced;
  auto replaced_future = replaced.get_future();
  auto first_call = true;
  // Long enough to live on the heap
  std::string expected(64, 'v');
  cli.set_server_certificate_verifier([&, expected](const VerifyContext &) {
    if (first_call) {
      first_call = false;
      entered.set_value();
      replaced_future.wait();
    }
    return expected == std::string(64, 'v');
  });

  thread request([&]() {
    auto res = cli.Get("/test");
    EXPECT_TRUE(res) << "Error: " << to_string(res.error());
  });

  entered.get_future().wait();
  cli.set_server_certificate_verifier(
      [](const VerifyContext &) { return true; });
  replaced.set_value();
  request.join();
}

// VerifyContext::session is the same handle the other tls:: functions take.
TEST(VerifyCallbackTest, SessionMatchesSessionVerifier) {
  using namespace httplib::tls;

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(false);

  session_t verifier_session = nullptr;
  cli.set_server_certificate_verifier([&](const VerifyContext &ctx) {
    verifier_session = ctx.session;
    return true;
  });

  session_t session_verifier_session = nullptr;
  cli.set_session_verifier([&](session_t session) {
    session_verifier_session = session;
    return SSLVerifierResponse::NoDecisionMade;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_NE(nullptr, verifier_session);
  EXPECT_EQ(session_verifier_session, verifier_session);
}

TEST(TlsVerifyErrorTest, GetVerifyErrorString) {
  using httplib::tls::TlsError;

  // Test that verify_error_to_string returns empty for success
  std::string success_str = TlsError::verify_error_to_string(0);
  EXPECT_TRUE(success_str.empty());

  // Test that verify_error_to_string returns non-empty for error codes
  // Using a common error code (certificate expired)
  std::string error_str =
      TlsError::verify_error_to_string(10); // X509_V_ERR_CERT_HAS_EXPIRED
  EXPECT_FALSE(error_str.empty());
}

TEST(SessionVerifierTest, CertificateAccepted) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  bool callback_called = false;
  cli.set_session_verifier([&](tls::session_t session) -> SSLVerifierResponse {
    EXPECT_NE(session, nullptr);
    callback_called = true;
    return SSLVerifierResponse::CertificateAccepted;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_TRUE(callback_called);
}

TEST(SessionVerifierTest, CertificateRejected) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  bool callback_called = false;
  cli.set_session_verifier([&](tls::session_t session) -> SSLVerifierResponse {
    EXPECT_NE(session, nullptr);
    callback_called = true;
    return SSLVerifierResponse::CertificateRejected;
  });

  auto res = cli.Get("/test");
  EXPECT_FALSE(res);
  EXPECT_TRUE(callback_called);
}

TEST(SessionVerifierTest, NoDecisionFallsThrough) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  // NoDecisionMade with verification disabled should succeed (no default check)
  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  bool callback_called = false;
  cli.set_session_verifier([&](tls::session_t session) -> SSLVerifierResponse {
    EXPECT_NE(session, nullptr);
    callback_called = true;
    return SSLVerifierResponse::NoDecisionMade;
  });

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_TRUE(callback_called);
}

TEST(SessionVerifierTest, NoDecisionWithVerificationEnabled) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });

  svr.wait_until_ready();

  // NoDecisionMade with verification enabled should fail (self-signed cert).
  // Note: On MbedTLS, the handshake itself fails before reaching the verifier,
  // so we only check that the request fails, not whether the callback was
  // called.
  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(true);
  cli.set_connection_timeout(30);

  cli.set_session_verifier([&](tls::session_t session) -> SSLVerifierResponse {
    EXPECT_NE(session, nullptr);
    return SSLVerifierResponse::NoDecisionMade;
  });

  auto res = cli.Get("/test");
  EXPECT_FALSE(res);
}

TEST(SSLClientServerTest, ClientCAListFromPem) {
  // Test SSL server using PemMemory constructor with client CA certificates

  // Read PEM files
  std::string server_cert_pem, server_key_pem, client_ca_pem;
  read_file(SERVER_CERT_FILE, server_cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, server_key_pem);
  read_file(CLIENT_CA_CERT_FILE, client_ca_pem);

  // Create SSLServer with PemMemory constructor including client CA
  SSLServer::PemMemory server_pem = {
      server_cert_pem.c_str(),
      server_cert_pem.size(),
      server_key_pem.c_str(),
      server_key_pem.size(),
      client_ca_pem.c_str(),
      client_ca_pem.size(),
      nullptr // no password for server key
  };
  SSLServer svr(server_pem);
  ASSERT_TRUE(svr.is_valid());

  // No SSL error should be recorded for valid setup
  EXPECT_EQ(0, svr.ssl_last_error());

  // Set up server endpoints
  svr.Get("/test-pem-ca", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  // Start server in a thread
  auto server_thread = thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  // Connect with client certificate (using constructor with paths)
  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);

  auto res = cli.Get("/test-pem-ca");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(200, res->status);
  EXPECT_EQ("ok", res->body);

  svr.stop();
  server_thread.join();
}
#endif

#ifdef _WIN32
TEST(CleanupTest, WSACleanup) {
  int ret = WSACleanup();
  ASSERT_EQ(0, ret);
}
#endif

#ifndef CPPHTTPLIB_SSL_ENABLED
TEST(NoSSLSupport, SimpleInterface) {
  ASSERT_ANY_THROW(Client cli("https://yahoo.com"));
}
#endif

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
TEST(InvalidScheme, SimpleInterface) {
  ASSERT_ANY_THROW(Client cli("scheme://yahoo.com"));
}
#endif

TEST(NoScheme, SimpleInterface) {
  Client cli("yahoo.com:80");
  ASSERT_TRUE(cli.is_valid());
}

TEST(SendAPI, SimpleInterface_Online) {
  Client cli("http://yahoo.com");

  Request req;
  req.method = "GET";
  req.path = "/";
  auto res = cli.send(req);

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);
}

TEST(SendAPI, WithParamsInRequest) {
  Server svr;

  svr.Get("/", [&](const Request &req, Response & /*res*/) {
    EXPECT_TRUE(req.has_param("test"));
    EXPECT_EQ("test_value", req.get_param_value("test"));
  });

  auto t = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  {
    Request req;
    req.method = "GET";
    req.path = "/";
    req.params.emplace("test", "test_value");
    auto res = cli.send(req);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  }
  {
    auto res = cli.Get("/", {{"test", "test_value"}}, Headers{});
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  }
}

TEST(ClientImplMethods, GetSocketTest) {
  httplib::Server svr;
  svr.Get("/", [&](const httplib::Request & /*req*/, httplib::Response &res) {
    res.status = StatusCode::OK_200;
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    httplib::Client cli("127.0.0.1", port);
    cli.set_keep_alive(true);

    // Use the behavior of cpp-httplib of opening the connection
    // only when the first request happens. If that changes,
    // this test would be obsolete.

    EXPECT_EQ(cli.socket(), INVALID_SOCKET);

    // This also implicitly tests the server. But other tests would fail much
    // earlier than this one to be considered.

    auto res = cli.Get("/");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());

    EXPECT_EQ(StatusCode::OK_200, res->status);
    ASSERT_TRUE(cli.socket() != INVALID_SOCKET);
  }
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(YahooRedirectTest2, SimpleInterface_Online) {
  Client cli("http://yahoo.com");

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);

  cli.set_follow_location(true);
  res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("https://www.yahoo.com/", res->location);
}

TEST(YahooRedirectTest3, SimpleInterface_Online) {
  Client cli("https://yahoo.com");

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);

  cli.set_follow_location(true);
  res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("https://www.yahoo.com/", res->location);
}

TEST(YahooRedirectTest3, NewResultInterface_Online) {
  Client cli("https://yahoo.com");

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_FALSE(!res);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_FALSE(res == nullptr);
  ASSERT_TRUE(res != nullptr);
  EXPECT_EQ(Error::Success, res.error());
  EXPECT_EQ(StatusCode::MovedPermanently_301, res.value().status);
  EXPECT_EQ(StatusCode::MovedPermanently_301, (*res).status);
  EXPECT_EQ(StatusCode::MovedPermanently_301, res->status);

  cli.set_follow_location(true);
  res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(Error::Success, res.error());
  EXPECT_EQ(StatusCode::OK_200, res.value().status);
  EXPECT_EQ(StatusCode::OK_200, (*res).status);
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("https://www.yahoo.com/", res->location);
}

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
TEST(DecodeWithChunkedEncoding, BrotliEncoding_Online) {
  Client cli("https://cdnjs.cloudflare.com");
  auto res = cli.Get("/ajax/libs/jquery/3.5.1/jquery.js",
                     Headers{{"Accept-Encoding", "br"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(287630U, res->body.size());
  EXPECT_EQ("application/javascript; charset=utf-8",
            res->get_header_value("Content-Type"));
}
#endif

// Previously "https://nghttp2.org" "/httpbin/redirect-to"
#undef REDIR_HOST // Silence compiler warning
#define REDIR_HOST "https://httpbingo.org"

TEST(HttpsToHttpRedirectTest, SimpleInterface_Online) {
  Client cli(REDIR_HOST);
  cli.set_follow_location(true);
  auto res =
      cli.Get(REDIR_PATH "?url=http%3A%2F%2Fexample.com&status_code=302");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(HttpsToHttpRedirectTest2, SimpleInterface_Online) {
  Client cli(REDIR_HOST);
  cli.set_follow_location(true);

  Params params;
  params.emplace("url", "http://example.com");
  params.emplace("status_code", "302");

  auto res = cli.Get(REDIR_PATH, params, Headers{});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(HttpsToHttpRedirectTest3, SimpleInterface_Online) {
  Client cli(REDIR_HOST);
  cli.set_follow_location(true);

  Params params;
  params.emplace("url", "http://example.com");

  auto res = cli.Get(REDIR_PATH "?status_code=302", params, Headers{});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(HttpToHttpsRedirectTest, CertFile) {
  auto ssl_port = PORT + 1;

  Server svr;
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/index", [&](const Request &, Response &res) {
    res.set_redirect("https://127.0.0.1:" + std::to_string(ssl_port) +
                     "/index");
    svr.stop();
  });

  SSLServer ssl_svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(ssl_svr.is_valid());
  ssl_svr.Get("/index", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
    ssl_svr.stop();
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  thread t2 =
      thread([&]() { ASSERT_TRUE(ssl_svr.listen("127.0.0.1", ssl_port)); });
  auto se = detail::scope_exit([&] {
    t2.join();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();
  ssl_svr.wait_until_ready();

  Client cli("127.0.0.1", PORT);
  cli.set_ca_cert_path(SERVER_CERT2_FILE);
  cli.enable_server_certificate_verification(true);
  cli.set_follow_location(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/index");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

TEST(SSLClientRedirectTest, CertFile) {
  auto ssl_port = PORT + 1;

  SSLServer ssl_svr1(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(ssl_svr1.is_valid());
  ssl_svr1.Get("/index", [&](const Request &, Response &res) {
    res.set_redirect("https://127.0.0.1:" + std::to_string(ssl_port) +
                     "/index");
    ssl_svr1.stop();
  });

  SSLServer ssl_svr2(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(ssl_svr2.is_valid());
  ssl_svr2.Get("/index", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
    ssl_svr2.stop();
  });

  thread t = thread([&]() { ASSERT_TRUE(ssl_svr1.listen("127.0.0.1", PORT)); });
  thread t2 =
      thread([&]() { ASSERT_TRUE(ssl_svr2.listen("127.0.0.1", ssl_port)); });
  auto se = detail::scope_exit([&] {
    t2.join();
    t.join();
    ASSERT_FALSE(ssl_svr1.is_running());
  });

  ssl_svr1.wait_until_ready();
  ssl_svr2.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_server_certificate_verification(true);
  cli.set_follow_location(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/index");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

// Redirects from a server with SERVER_CERT2_FILE to one with target_cert on
// another port, so the client follows it with a new client.
static Result GetThroughTlsRedirectToDifferentPort(
    const std::function<void(SSLClient &)> &setup,
    const char *target_cert = SERVER_CERT2_FILE,
    const char *target_key = SERVER_PRIVATE_KEY_FILE) {
  auto ssl_port = PORT + 1;

  SSLServer ssl_svr1(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ssl_svr1.Get("/index", [&](const Request &, Response &res) {
    res.set_redirect("https://127.0.0.1:" + std::to_string(ssl_port) +
                     "/index");
  });

  SSLServer ssl_svr2(target_cert, target_key);
  ssl_svr2.Get("/index", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ssl_svr1.listen("127.0.0.1", PORT); });
  thread t2 = thread([&]() { ssl_svr2.listen("127.0.0.1", ssl_port); });
  auto se = detail::scope_exit([&] {
    ssl_svr2.stop();
    ssl_svr1.stop();
    t2.join();
    t.join();
  });

  ssl_svr1.wait_until_ready();
  ssl_svr2.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  cli.set_follow_location(true);
  cli.set_connection_timeout(30);
  setup(cli);
  return cli.Get("/index");
}

TEST(SSLClientRedirectTest, KeepSessionVerifier) {
  auto calls = 0;
  auto res = GetThroughTlsRedirectToDifferentPort([&](SSLClient &cli) {
    cli.enable_server_certificate_verification(false);
    // Accept the first server only.
    cli.set_session_verifier([&](tls::session_t) {
      return ++calls == 1 ? SSLVerifierResponse::NoDecisionMade
                          : SSLVerifierResponse::CertificateRejected;
    });
  });
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
  EXPECT_EQ(2, calls);
}

TEST(SSLClientRedirectTest, KeepServerCertificateVerifier) {
  std::string pinned;
  auto res = GetThroughTlsRedirectToDifferentPort(
      [&](SSLClient &cli) {
        cli.enable_server_certificate_verification(false);
        // Pin the first certificate seen.
        cli.set_server_certificate_verifier([&](const tls::VerifyContext &ctx) {
          if (pinned.empty()) { pinned = ctx.serial(); }
          return ctx.serial() == pinned;
        });
      },
      // A certificate other than the first server's.
      SERVER_CERT_FILE);
  EXPECT_FALSE(res);
  EXPECT_FALSE(pinned.empty());
}

TEST(SSLClientRedirectTest, KeepCaCertStore) {
  auto res = GetThroughTlsRedirectToDifferentPort([](SSLClient &cli) {
    std::string cert;
    read_file(SERVER_CERT2_FILE, cert);
    cli.set_ca_cert_store(tls::create_ca_store(cert.c_str(), cert.size()));
  });
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

// The target's certificate is signed by the root CA, which the first server's
// is not. Its name is not checked, as it carries none of 127.0.0.1.
TEST(SSLClientRedirectTest, KeepEveryCaCertPem) {
  auto res = GetThroughTlsRedirectToDifferentPort(
      [](SSLClient &cli) {
        std::string root_ca, cert;
        read_file(CLIENT_CA_CERT_FILE, root_ca);
        read_file(SERVER_CERT2_FILE, cert);
        cli.load_ca_cert_store(root_ca.data(), root_ca.size());
        cli.load_ca_cert_store(cert.data(), cert.size());
        cli.enable_server_hostname_verification(false);
      },
      CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

#ifndef CPPHTTPLIB_WOLFSSL_SUPPORT
// set_ca_cert_store() replaces the root CA loaded before it, so the target is
// not trusted after the redirect either. (wolfSSL adds the store instead.)
TEST(SSLClientRedirectTest, CaCertStoreReplacesEarlierPem) {
  auto res = GetThroughTlsRedirectToDifferentPort(
      [](SSLClient &cli) {
        std::string root_ca, cert;
        read_file(CLIENT_CA_CERT_FILE, root_ca);
        read_file(SERVER_CERT2_FILE, cert);
        cli.load_ca_cert_store(root_ca.data(), root_ca.size());
        cli.set_ca_cert_store(tls::create_ca_store(cert.c_str(), cert.size()));
        cli.enable_server_hostname_verification(false);
      },
      CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
}
#endif
#endif

#ifdef CPPHTTPLIB_SSL_ENABLED
// Test that set_ca_cert_store() skips system certs (consistent with
// set_ca_cert_path behavior). When a custom cert store is set, only those certs
// should be trusted - system certs should NOT be loaded.
TEST(SSLClientTest, SetCaCertStoreSkipsSystemCerts_Online) {
  // Load a specific cert that is NOT a system CA cert
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);

  SSLClient cli("google.com");
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_server_certificate_verification(true);

  // This should FAIL because:
  // 1. We loaded only SERVER_CERT2 (a test cert, not a CA for google.com)
  // 2. System certs should NOT be loaded when custom store is set
  // If system certs WERE loaded, this would succeed
  auto res = cli.Get("/");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
}

// Same as above, but through the native store handle path. Regression test:
// set_ca_cert_store() used to leave no trace on the client, so load_certs()
// merged system certs into the user-provided store.
TEST(SSLClientTest, SetCaCertStoreNativeSkipsSystemCerts_Online) {
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);

  SSLClient cli("google.com");
  cli.set_ca_cert_store(tls::create_ca_store(cert.c_str(), cert.size()));
  cli.enable_server_certificate_verification(true);

  auto res = cli.Get("/");
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
}

// A custom store set via the native handle must still verify a server whose
// cert it does contain.
TEST(SSLClientTest, SetCaCertStoreNativeVerifiesLocalServer) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  cli.set_ca_cert_store(tls::create_ca_store(cert.c_str(), cert.size()));
  cli.enable_server_certificate_verification(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

// CA certs loaded through the universal Client must be transferred to the
// client created internally for following an HTTPS redirect. Regression test:
// Client::load_ca_cert_store() used to bypass the PEM-based path that stores
// the CA data for redirect transfer.
TEST(UniversalClientRedirectTest, LoadCaCertStore) {
  auto ssl_port = PORT + 1;

  SSLServer ssl_svr1(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(ssl_svr1.is_valid());
  ssl_svr1.Get("/index", [&](const Request &, Response &res) {
    res.set_redirect("https://127.0.0.1:" + std::to_string(ssl_port) +
                     "/index");
  });

  SSLServer ssl_svr2(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(ssl_svr2.is_valid());
  ssl_svr2.Get("/index", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(ssl_svr1.listen("127.0.0.1", PORT)); });
  thread t2 =
      thread([&]() { ASSERT_TRUE(ssl_svr2.listen("127.0.0.1", ssl_port)); });
  auto se = detail::scope_exit([&] {
    ssl_svr2.stop();
    ssl_svr1.stop();
    t2.join();
    t.join();
    ASSERT_FALSE(ssl_svr1.is_running());
  });

  ssl_svr1.wait_until_ready();
  ssl_svr2.wait_until_ready();

  Client cli("https://127.0.0.1:" + std::to_string(PORT));
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_server_certificate_verification(true);
  cli.set_follow_location(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/index");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

// enable_system_ca(true) loads system CA certs in addition to a custom CA,
// so a host signed by a system CA verifies even though a custom CA is set
TEST(SSLClientTest, EnableSystemCaWithCustomCa_Online) {
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);

  SSLClient cli("google.com");
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_system_ca(true);
  cli.enable_server_certificate_verification(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

// The custom CA remains effective when combined with the system CA
TEST(SSLClientTest, EnableSystemCaCustomCaVerifiesLocalServer) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_system_ca(true);
  cli.enable_server_certificate_verification(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

#ifdef CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN
// A usage-constraints dictionary of a Keychain Trust Settings array, with
// the keys SecTrustSettingsCopyTrustSettings() returns.
static CFDictionaryRef
make_usage_constraint(SecPolicyRef policy, const char *policy_string,
                      const SecTrustSettingsResult *result) {
  auto constraint =
      CFDictionaryCreateMutable(nullptr, 0, &kCFTypeDictionaryKeyCallBacks,
                                &kCFTypeDictionaryValueCallBacks);
  if (policy) {
    CFDictionarySetValue(constraint, kSecTrustSettingsPolicy, policy);
  }
  if (policy_string) {
    auto str = CFStringCreateWithCString(nullptr, policy_string,
                                         kCFStringEncodingUTF8);
    CFDictionarySetValue(constraint, kSecTrustSettingsPolicyString, str);
    CFRelease(str);
  }
  if (result) {
    auto number_value = static_cast<SInt32>(*result);
    auto number = CFNumberCreate(nullptr, kCFNumberSInt32Type, &number_value);
    CFDictionarySetValue(constraint, kSecTrustSettingsResult, number);
    CFRelease(number);
  }
  return constraint;
}

static SecTrustSettingsResult
ssl_trust_settings_result(std::vector<CFDictionaryRef> constraints) {
  auto trust_settings =
      CFArrayCreateMutable(nullptr, 0, &kCFTypeArrayCallBacks);
  for (auto constraint : constraints) {
    CFArrayAppendValue(trust_settings, constraint);
    CFRelease(constraint);
  }
  auto result = tls::impl::macos_ssl_trust_settings_result(trust_settings);
  CFRelease(trust_settings);
  return result;
}

// The system CA loader takes a Keychain certificate as a trusted root only
// when its Trust Settings say so for SSL, not merely because it has some.
TEST(SSLClientTest, MacOSKeychainTrustSettingsForSSL) {
  const auto trust_root = kSecTrustSettingsResultTrustRoot;
  const auto trust_as_root = kSecTrustSettingsResultTrustAsRoot;
  const auto deny = kSecTrustSettingsResultDeny;
  const auto unspecified = kSecTrustSettingsResultUnspecified;
  auto ssl_policy = SecPolicyCreateSSL(true, nullptr);
  auto x509_policy = SecPolicyCreateBasicX509();

  // "Always Trust", which stores no constraint at all
  EXPECT_EQ(kSecTrustSettingsResultTrustRoot, ssl_trust_settings_result({}));
  EXPECT_EQ(kSecTrustSettingsResultTrustRoot,
            ssl_trust_settings_result(
                {make_usage_constraint(nullptr, nullptr, nullptr)}));
  EXPECT_EQ(kSecTrustSettingsResultTrustRoot,
            ssl_trust_settings_result(
                {make_usage_constraint(ssl_policy, nullptr, &trust_root)}));
  EXPECT_EQ(kSecTrustSettingsResultTrustAsRoot,
            ssl_trust_settings_result(
                {make_usage_constraint(ssl_policy, nullptr, &trust_as_root)}));

  // "Never Trust", for everything or for SSL
  EXPECT_EQ(kSecTrustSettingsResultDeny,
            ssl_trust_settings_result(
                {make_usage_constraint(nullptr, nullptr, &deny)}));
  EXPECT_EQ(kSecTrustSettingsResultDeny,
            ssl_trust_settings_result(
                {make_usage_constraint(ssl_policy, nullptr, &deny)}));

  // Trusted for another policy, for one host, or not at all
  EXPECT_EQ(kSecTrustSettingsResultUnspecified,
            ssl_trust_settings_result(
                {make_usage_constraint(x509_policy, nullptr, &trust_root)}));
  EXPECT_EQ(kSecTrustSettingsResultUnspecified,
            ssl_trust_settings_result({make_usage_constraint(
                ssl_policy, "www.example.com", &trust_root)}));
  EXPECT_EQ(kSecTrustSettingsResultUnspecified,
            ssl_trust_settings_result(
                {make_usage_constraint(nullptr, nullptr, &unspecified)}));

  // The first constraint that applies to SSL decides
  EXPECT_EQ(kSecTrustSettingsResultDeny,
            ssl_trust_settings_result(
                {make_usage_constraint(x509_policy, nullptr, &trust_root),
                 make_usage_constraint(nullptr, nullptr, &deny)}));

  CFRelease(x509_policy);
  CFRelease(ssl_policy);
}
#endif

// Regression test: for IP hosts the Mbed TLS and wolfSSL backends used to
// skip chain verification entirely (only the certificate identity was
// checked), so a server presenting an untrusted certificate with a matching
// IP SAN was accepted. The chain must be validated for IP hosts too.
TEST(SSLClientTest, IpHostUntrustedChainFails) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/test", [&](const Request &, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli("127.0.0.1", PORT);
  std::string cert;
  // A trusted CA that did not sign the server certificate. The server cert
  // (cert2) carries the matching IP SAN, so only chain validation can reject
  // this connection.
  read_file(CLIENT_CA_CERT_FILE, cert);
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_server_certificate_verification(true);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_FALSE(res);
}

#ifndef CPPHTTPLIB_WOLFSSL_SUPPORT
// A custom CA that brings no certificate still keeps the system CAs out, so a
// CA that failed to come through fails verification instead of trusting them.
// (wolfSSL does not list the system CAs it loaded.)
TEST(SSLClientTest, EmptyCustomCaKeepsSystemCasOut) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  auto port = svr.bind_to_any_port("127.0.0.1");
  ASSERT_LT(0, port);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // The CAs a client trusts once its first request has loaded them
  auto loaded_cas = [&](const std::function<void(Client &)> &setup) {
    Client cli("https://127.0.0.1:" + std::to_string(port));
    setup(cli);
    cli.Get("/");
    return tls::get_ca_names(cli.tls_context()).size();
  };

  EXPECT_EQ(0u, loaded_cas([](Client &cli) { cli.load_ca_cert_store("", 0); }));
  EXPECT_EQ(0u,
            loaded_cas([](Client &cli) { cli.set_ca_cert_store(nullptr); }));
}
#endif

// A TLS setting changed between requests applies to the next one, not just to
// the next connection
TEST(SSLClientTest, TlsSettingChangeClosesKeptAliveConnection) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/", [](const Request &req, Response &res) {
    res.set_content(std::to_string(req.remote_port), "text/plain");
  });
  auto port = svr.bind_to_any_port("127.0.0.1");
  ASSERT_LT(0, port);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  SSLClient cli("127.0.0.1", port);
  cli.set_keep_alive(true);
  cli.set_ca_cert_path(CLIENT_CA_CERT_FILE); // does not trust cert2.pem
  cli.enable_server_certificate_verification(false);

  // The port the request went out from, so a new one means a new connection
  auto client_port = [&] {
    auto res = cli.Get("/");
    return res ? res->body : std::string();
  };
  auto last = client_port();
  ASSERT_FALSE(last.empty());

  // Setting a value it already has keeps the connection
  cli.enable_server_certificate_verification(false);
  cli.enable_server_hostname_verification(true);
  EXPECT_EQ(last, client_port());

  cli.enable_server_certificate_verification(true);
  auto res = cli.Get("/");
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());

  std::string ca;
  read_file(SERVER_CERT2_FILE, ca);
  cli.load_ca_cert_store(ca.c_str(), ca.size());
  last = client_port();
  ASSERT_FALSE(last.empty());

  std::vector<std::function<void()>> setters = {
      [&] { cli.enable_server_hostname_verification(false); },
      [&] { cli.load_ca_cert_store(ca.c_str(), ca.size()); },
      [&] {
        cli.set_ca_cert_store(tls::create_ca_store(ca.c_str(), ca.size()));
      },
      [&] {
        cli.set_server_certificate_verifier(
            [](const tls::VerifyContext &) { return true; });
      },
      [&] {
        cli.set_session_verifier(
            [](tls::session_t) { return SSLVerifierResponse::NoDecisionMade; });
      },
  };
  for (const auto &setter : setters) {
    setter();
    auto next = client_port();
    ASSERT_FALSE(next.empty());
    EXPECT_NE(last, next);
    last = next;
  }

  cli.set_session_verifier(
      [](tls::session_t) { return SSLVerifierResponse::CertificateRejected; });
  auto handle = cli.open_stream("GET", "/");
  EXPECT_FALSE(handle.is_valid());
  EXPECT_EQ(Error::SSLServerVerification, handle.error);
}

// A PEM given to create_ca_store() needs no NUL after it
TEST(SSLClientTest, CreateCaStoreFromPemWithoutNul) {
  std::string pem;
  read_file(SERVER_CERT2_FILE, pem);
  auto buf = pem + "X";
  auto store = tls::create_ca_store(buf.data(), pem.size());
  EXPECT_TRUE(store != nullptr);
  SSLClient cli("localhost");
  cli.set_ca_cert_store(store);
}

// enable_system_ca(false) prevents system CA loading entirely
TEST(SSLClientTest, DisableSystemCa_Online) {
  SSLClient cli("google.com");
  cli.enable_system_ca(false);
  cli.enable_server_certificate_verification(true);

  auto res = cli.Get("/");
  ASSERT_FALSE(res);
  // OpenSSL reports a verification failure; Mbed TLS fails the handshake
  // itself when the CA chain is empty
  EXPECT_TRUE(res.error() == Error::SSLServerVerification ||
              res.error() == Error::SSLConnection);
}

// The universal Client forwards enable_system_ca()
TEST(UniversalClientTest, EnableSystemCaWithCustomCa_Online) {
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);

  Client cli("https://google.com");
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_system_ca(true);
  cli.enable_server_certificate_verification(true);

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::MovedPermanently_301, res->status);
}

// The system CA policy must carry over to the client created internally for
// following a cross-host HTTPS redirect
TEST(UniversalClientRedirectTest, EnableSystemCaCarriesOver_Online) {
  SSLServer svr(SERVER_CERT2_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.Get("/index", [&](const Request &, Response &res) {
    res.set_redirect("https://www.google.com/");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen("127.0.0.1", PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("https://127.0.0.1:" + std::to_string(PORT));
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  cli.load_ca_cert_store(cert.c_str(), cert.size());
  cli.enable_system_ca(true);
  cli.enable_server_certificate_verification(true);
  cli.set_follow_location(true);
  cli.set_connection_timeout(30);

  // Receiving any response proves the redirect client completed the TLS
  // handshake with a system-CA-signed host
  auto res = cli.Get("/index");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
}

TEST(MultipartFormDataTest, LargeData) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  svr.Post("/post", [&](const Request &req, Response & /*res*/,
                        const ContentReader &content_reader) {
    if (req.is_multipart_form_data()) {
      std::vector<FormData> items;
      content_reader(
          [&](const FormData &file) {
            items.push_back(file);
            return true;
          },
          [&](const char *data, size_t data_length) {
            items.back().content.append(data, data_length);
            return true;
          });

      EXPECT_TRUE(std::string(items[0].name) == "document");
      EXPECT_EQ(size_t(1024 * 1024 * 2), items[0].content.size());
      EXPECT_TRUE(items[0].filename == "2MB_data");
      EXPECT_TRUE(items[0].content_type == "application/octet-stream");

      EXPECT_TRUE(items[1].name == "hello");
      EXPECT_TRUE(items[1].content == "world");
      EXPECT_TRUE(items[1].filename == "");
      EXPECT_TRUE(items[1].content_type == "");
    } else {
      std::string body;
      content_reader([&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });
    }
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    std::string data(1024 * 1024 * 2, '.');
    std::stringstream buffer;
    buffer << data;

    SSLClient cli(HOST, port);
    cli.enable_server_certificate_verification(false);

    UploadFormDataItems items{
        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
        {"hello", "world", "", ""},
    };

    auto res = cli.Post("/post", items);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    ASSERT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(MultipartFormDataTest, DataProviderItems) {

  std::random_device seed_gen;
  std::mt19937 random(seed_gen());

  std::string rand1;
  rand1.resize(1000);
  std::generate(rand1.begin(), rand1.end(), [&]() { return random(); });

  std::string rand2;
  rand2.resize(3000);
  std::generate(rand2.begin(), rand2.end(), [&]() { return random(); });

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  svr.Post("/post-none", [&](const Request &req, Response & /*res*/,
                             const ContentReader &content_reader) {
    ASSERT_FALSE(req.is_multipart_form_data());

    std::string body;
    content_reader([&](const char *data, size_t data_length) {
      body.append(data, data_length);
      return true;
    });

    EXPECT_EQ(body, "");
  });

  svr.Post("/post-items", [&](const Request &req, Response & /*res*/,
                              const ContentReader &content_reader) {
    ASSERT_TRUE(req.is_multipart_form_data());
    std::vector<FormData> items;
    content_reader(
        [&](const FormData &file) {
          items.push_back(file);
          return true;
        },
        [&](const char *data, size_t data_length) {
          items.back().content.append(data, data_length);
          return true;
        });

    ASSERT_TRUE(items.size() == 2);

    EXPECT_EQ(std::string(items[0].name), "name1");
    EXPECT_EQ(items[0].content, "Testing123");
    EXPECT_EQ(items[0].filename, "filename1");
    EXPECT_EQ(items[0].content_type, "application/octet-stream");

    EXPECT_EQ(items[1].name, "name2");
    EXPECT_EQ(items[1].content, "Testing456");
    EXPECT_EQ(items[1].filename, "");
    EXPECT_EQ(items[1].content_type, "");
  });

  svr.Post("/post-providers", [&](const Request &req, Response & /*res*/,
                                  const ContentReader &content_reader) {
    ASSERT_TRUE(req.is_multipart_form_data());
    std::vector<FormData> items;
    content_reader(
        [&](const FormData &file) {
          items.push_back(file);
          return true;
        },
        [&](const char *data, size_t data_length) {
          items.back().content.append(data, data_length);
          return true;
        });

    ASSERT_TRUE(items.size() == 2);

    EXPECT_EQ(items[0].name, "name3");
    EXPECT_EQ(items[0].content, rand1);
    EXPECT_EQ(items[0].filename, "filename3");
    EXPECT_EQ(items[0].content_type, "");

    EXPECT_EQ(items[1].name, "name4");
    EXPECT_EQ(items[1].content, rand2);
    EXPECT_EQ(items[1].filename, "filename4");
    EXPECT_EQ(items[1].content_type, "");
  });

  svr.Post("/post-both", [&](const Request &req, Response & /*res*/,
                             const ContentReader &content_reader) {
    ASSERT_TRUE(req.is_multipart_form_data());
    std::vector<FormData> items;
    content_reader(
        [&](const FormData &file) {
          items.push_back(file);
          return true;
        },
        [&](const char *data, size_t data_length) {
          items.back().content.append(data, data_length);
          return true;
        });

    ASSERT_TRUE(items.size() == 4);

    EXPECT_EQ(std::string(items[0].name), "name1");
    EXPECT_EQ(items[0].content, "Testing123");
    EXPECT_EQ(items[0].filename, "filename1");
    EXPECT_EQ(items[0].content_type, "application/octet-stream");

    EXPECT_EQ(items[1].name, "name2");
    EXPECT_EQ(items[1].content, "Testing456");
    EXPECT_EQ(items[1].filename, "");
    EXPECT_EQ(items[1].content_type, "");

    EXPECT_EQ(items[2].name, "name3");
    EXPECT_EQ(items[2].content, rand1);
    EXPECT_EQ(items[2].filename, "filename3");
    EXPECT_EQ(items[2].content_type, "");

    EXPECT_EQ(items[3].name, "name4");
    EXPECT_EQ(items[3].content, rand2);
    EXPECT_EQ(items[3].filename, "filename4");
    EXPECT_EQ(items[3].content_type, "");
  });

  auto port = svr.bind_to_any_port("localhost");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    SSLClient cli("localhost", port);
    cli.enable_server_certificate_verification(false);

    UploadFormDataItems items{
        {"name1", "Testing123", "filename1", "application/octet-stream"},
        {"name2", "Testing456", "", ""}, // not a file
    };

    {
      auto res = cli.Post("/post-none", {}, {}, {});
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      ASSERT_EQ(StatusCode::OK_200, res->status);
    }

    FormDataProviderItems providers;

    {
      auto res =
          cli.Post("/post-items", {}, items, providers); // empty providers
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      ASSERT_EQ(StatusCode::OK_200, res->status);
    }

    providers.push_back({"name3",
                         [&](size_t offset, httplib::DataSink &sink) -> bool {
                           // test the offset is given correctly at each step
                           if (!offset)
                             sink.os.write(rand1.data(), 30);
                           else if (offset == 30)
                             sink.os.write(rand1.data() + 30, 300);
                           else if (offset == 330)
                             sink.os.write(rand1.data() + 330, 670);
                           else if (offset == rand1.size())
                             sink.done();
                           return true;
                         },
                         "filename3",
                         {}});

    providers.push_back({"name4",
                         [&](size_t offset, httplib::DataSink &sink) -> bool {
                           // test the offset is given correctly at each step
                           if (!offset)
                             sink.os.write(rand2.data(), 2000);
                           else if (offset == 2000)
                             sink.os.write(rand2.data() + 2000, 1);
                           else if (offset == 2001)
                             sink.os.write(rand2.data() + 2001, 999);
                           else if (offset == rand2.size())
                             sink.done();
                           return true;
                         },
                         "filename4",
                         {}});

    {
      auto res = cli.Post("/post-providers", {}, {}, providers);
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      ASSERT_EQ(StatusCode::OK_200, res->status);
    }

    {
      auto res = cli.Post("/post-both", {}, items, providers);
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      ASSERT_EQ(StatusCode::OK_200, res->status);
    }
  }
}

TEST(MultipartFormDataTest, BadHeader) {
  Server svr;
  svr.Post("/post", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string body =
      "This is the preamble.  It is to be ignored, though it\r\n"
      "is a handy place for composition agents to include an\r\n"
      "explanatory note to non-MIME conformant readers.\r\n"
      "\r\n"
      "\r\n"
      "--simple boundary\r\n"
      "Content-Disposition: form-data; name=\"field1\"\r\n"
      ": BAD...\r\n"
      "\r\n"
      "value1\r\n"
      "--simple boundary\r\n"
      "Content-Disposition: form-data; name=\"field2\"; "
      "filename=\"example.txt\"\r\n"
      "\r\n"
      "value2\r\n"
      "--simple boundary--\r\n"
      "This is the epilogue.  It is also to be ignored.\r\n";

  std::string content_type =
      R"(multipart/form-data; boundary="simple boundary")";

  Client cli(HOST, PORT);
  auto res = cli.Post("/post", body, content_type.c_str());

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
}

TEST(MultipartFormDataTest, WithPreamble) {
  Server svr;
  svr.Post("/post", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string body =
      "This is the preamble.  It is to be ignored, though it\r\n"
      "is a handy place for composition agents to include an\r\n"
      "explanatory note to non-MIME conformant readers.\r\n"
      "\r\n"
      "\r\n"
      "--simple boundary\r\n"
      "Content-Disposition: form-data; name=\"field1\"\r\n"
      "\r\n"
      "value1\r\n"
      "--simple boundary\r\n"
      "Content-Disposition: form-data; name=\"field2\"; "
      "filename=\"example.txt\"\r\n"
      "\r\n"
      "value2\r\n"
      "--simple boundary--\r\n"
      "This is the epilogue.  It is also to be ignored.\r\n";

  std::string content_type =
      R"(multipart/form-data; boundary="simple boundary")";

  Client cli(HOST, PORT);
  auto res = cli.Post("/post", body, content_type.c_str());

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MultipartFormDataTest, PostCustomBoundary) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  svr.Post("/post_customboundary", [&](const Request &req, Response & /*res*/,
                                       const ContentReader &content_reader) {
    if (req.is_multipart_form_data()) {
      std::vector<FormData> items;
      content_reader(
          [&](const FormData &file) {
            items.push_back(file);
            return true;
          },
          [&](const char *data, size_t data_length) {
            items.back().content.append(data, data_length);
            return true;
          });

      EXPECT_TRUE(std::string(items[0].name) == "document");
      EXPECT_EQ(size_t(1024 * 1024 * 2), items[0].content.size());
      EXPECT_TRUE(items[0].filename == "2MB_data");
      EXPECT_TRUE(items[0].content_type == "application/octet-stream");

      EXPECT_TRUE(items[1].name == "hello");
      EXPECT_TRUE(items[1].content == "world");
      EXPECT_TRUE(items[1].filename == "");
      EXPECT_TRUE(items[1].content_type == "");
    } else {
      std::string body;
      content_reader([&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });
    }
  });

  auto port = svr.bind_to_any_port("localhost");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    std::string data(1024 * 1024 * 2, '.');
    std::stringstream buffer;
    buffer << data;

    SSLClient cli("localhost", port);
    cli.enable_server_certificate_verification(false);

    UploadFormDataItems items{
        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
        {"hello", "world", "", ""},
    };

    auto res = cli.Post("/post_customboundary", {}, items, "abc-abc");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    ASSERT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(MultipartFormDataTest, PostInvalidBoundaryChars) {
  std::string data(1024 * 1024 * 2, '&');
  std::stringstream buffer;
  buffer << data;

  Client cli("https://localhost:8080");

  UploadFormDataItems items{
      {"document", buffer.str(), "2MB_data", "application/octet-stream"},
      {"hello", "world", "", ""},
  };

  for (const char &c : " \t\r\n") {
    auto res =
        cli.Post("/invalid_boundary", {}, items, string("abc123").append(1, c));
    ASSERT_EQ(Error::UnsupportedMultipartBoundaryChars, res.error());
    ASSERT_FALSE(res);
  }
}

TEST(MultipartFormDataTest, PutFormData) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  svr.Put("/put", [&](const Request &req, const Response & /*res*/,
                      const ContentReader &content_reader) {
    if (req.is_multipart_form_data()) {
      std::vector<FormData> items;
      content_reader(
          [&](const FormData &file) {
            items.push_back(file);
            return true;
          },
          [&](const char *data, size_t data_length) {
            items.back().content.append(data, data_length);
            return true;
          });

      EXPECT_TRUE(std::string(items[0].name) == "document");
      EXPECT_EQ(size_t(1024 * 1024 * 2), items[0].content.size());
      EXPECT_TRUE(items[0].filename == "2MB_data");
      EXPECT_TRUE(items[0].content_type == "application/octet-stream");

      EXPECT_TRUE(items[1].name == "hello");
      EXPECT_TRUE(items[1].content == "world");
      EXPECT_TRUE(items[1].filename == "");
      EXPECT_TRUE(items[1].content_type == "");
    } else {
      std::string body;
      content_reader([&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      });
    }
  });

  auto port = svr.bind_to_any_port("localhost");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    std::string data(1024 * 1024 * 2, '&');
    std::stringstream buffer;
    buffer << data;

    SSLClient cli("localhost", port);
    cli.enable_server_certificate_verification(false);

    UploadFormDataItems items{
        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
        {"hello", "world", "", ""},
    };

    auto res = cli.Put("/put", items);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    ASSERT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(MultipartFormDataTest, PutFormDataCustomBoundary) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  svr.Put("/put_customboundary",
          [&](const Request &req, const Response & /*res*/,
              const ContentReader &content_reader) {
            if (req.is_multipart_form_data()) {
              std::vector<FormData> items;
              content_reader(
                  [&](const FormData &file) {
                    items.push_back(file);
                    return true;
                  },
                  [&](const char *data, size_t data_length) {
                    items.back().content.append(data, data_length);
                    return true;
                  });

              EXPECT_TRUE(std::string(items[0].name) == "document");
              EXPECT_EQ(size_t(1024 * 1024 * 2), items[0].content.size());
              EXPECT_TRUE(items[0].filename == "2MB_data");
              EXPECT_TRUE(items[0].content_type == "application/octet-stream");

              EXPECT_TRUE(items[1].name == "hello");
              EXPECT_TRUE(items[1].content == "world");
              EXPECT_TRUE(items[1].filename == "");
              EXPECT_TRUE(items[1].content_type == "");
            } else {
              std::string body;
              content_reader([&](const char *data, size_t data_length) {
                body.append(data, data_length);
                return true;
              });
            }
          });

  auto port = svr.bind_to_any_port("localhost");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    std::string data(1024 * 1024 * 2, '&');
    std::stringstream buffer;
    buffer << data;

    SSLClient cli("localhost", port);
    cli.enable_server_certificate_verification(false);

    UploadFormDataItems items{
        {"document", buffer.str(), "2MB_data", "application/octet-stream"},
        {"hello", "world", "", ""},
    };

    auto res = cli.Put("/put_customboundary", {}, items, "abc-abc_");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    ASSERT_EQ(StatusCode::OK_200, res->status);
  }
}

TEST(MultipartFormDataTest, PutInvalidBoundaryChars) {
  std::string data(1024 * 1024 * 2, '&');
  std::stringstream buffer;
  buffer << data;

  Client cli("https://localhost:8080");
  cli.enable_server_certificate_verification(false);

  UploadFormDataItems items{
      {"document", buffer.str(), "2MB_data", "application/octet-stream"},
      {"hello", "world", "", ""},
  };

  for (const char &c : " \t\r\n") {
    auto res = cli.Put("/put", {}, items, string("abc123").append(1, c));
    ASSERT_EQ(Error::UnsupportedMultipartBoundaryChars, res.error());
    ASSERT_FALSE(res);
  }
}

TEST(MultipartFormDataTest, AlternateFilename) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &req, Response &res) {
    ASSERT_EQ(2u, req.form.files.size());
    ASSERT_EQ(1u, req.form.fields.size());

    // Test files
    const auto &file1 = req.form.get_file("file1");
    ASSERT_EQ("file1", file1.name);
    ASSERT_EQ("A.txt", file1.filename);
    ASSERT_EQ("text/plain", file1.content_type);
    ASSERT_EQ("Content of a.txt.\r\n", file1.content);

    const auto &file2 = req.form.get_file("file2");
    ASSERT_EQ("file2", file2.name);
    ASSERT_EQ("a.html", file2.filename);
    ASSERT_EQ("text/html", file2.content_type);
    ASSERT_EQ("<!DOCTYPE html><title>Content of a.html.</title>\r\n",
              file2.content);

    // Test text field
    const auto &text = req.form.get_field("text");
    ASSERT_EQ("text default", text);

    res.set_content("ok", "text/plain");

    handled = true;
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  auto req = "POST /test HTTP/1.1\r\n"
             "Host: localhost\r\n"
             "Content-Type: multipart/form-data;boundary=--------\r\n"
             "Content-Length: 399\r\n"
             "\r\n"
             "----------\r\n"
             "Content-Disposition: form-data; name=\"text\"\r\n"
             "\r\n"
             "text default\r\n"
             "----------\r\n"
             "Content-Disposition: form-data; filename*=\"UTF-8''%41.txt\"; "
             "filename=\"a.txt\"; name=\"file1\"\r\n"
             "Content-Type: text/plain\r\n"
             "\r\n"
             "Content of a.txt.\r\n"
             "\r\n"
             "----------\r\n"
             "Content-Disposition: form-data;  name=\"file2\" ;filename = "
             "\"a.html\"\r\n"
             "Content-Type: text/html\r\n"
             "\r\n"
             "<!DOCTYPE html><title>Content of a.html.</title>\r\n"
             "\r\n"
             "------------\r\n";

  ASSERT_TRUE(send_request(1, req));
}

TEST(MultipartFormDataTest, AlternateFilenameLongValueAndCaseInsensitive) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &req, Response &res) {
    // Case-insensitive "utf-8''" prefix with a long value
    const auto &file = req.form.get_file("file1");
    ASSERT_EQ("file1", file.name);
    // 8000 chars exercises both the Content-Disposition parser and the
    // filename* parser near the CPPHTTPLIB_HEADER_MAX_LENGTH limit (8192).
    // Prior to the fix, std::regex_match on this header would cause O(N)
    // stack recursion in libstdc++, leading to SIGSEGV.
    std::string expected_filename(8000, 'A');
    ASSERT_EQ(expected_filename, file.filename);

    res.set_content("ok", "text/plain");
    handled = true;
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  // Build body with a long filename* value using mixed-case prefix "Utf-8''"
  // Regression test for GHSA-qq6v-r583-3h69
  std::string long_filename(8000, 'A');
  std::string body = "----------\r\n"
                     "Content-Disposition: form-data; name=\"file1\"; "
                     "filename*=\"Utf-8''" +
                     long_filename +
                     "\"\r\n"
                     "\r\n"
                     "hello\r\n"
                     "------------\r\n";

  auto req = "POST /test HTTP/1.1\r\n"
             "Host: localhost\r\n"
             "Content-Type: multipart/form-data;boundary=--------\r\n"
             "Content-Length: " +
             std::to_string(body.size()) + "\r\n\r\n" + body;

  ASSERT_TRUE(send_request(1, req));
}

TEST(MultipartFormDataTest, CloseDelimiterWithoutCRLF) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &req, Response &) {
    ASSERT_EQ(2u, req.form.fields.size());

    const auto &text1 = req.form.get_field("text1");
    ASSERT_EQ("text1", text1);

    const auto &text2 = req.form.get_field("text2");
    ASSERT_EQ("text2", text2);

    handled = true;
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  auto req = "POST /test HTTP/1.1\r\n"
             "Host: localhost\r\n"
             "Content-Type: multipart/form-data;boundary=--------\r\n"
             "Content-Length: 146\r\n"
             "\r\n----------\r\n"
             "Content-Disposition: form-data; name=\"text1\"\r\n"
             "\r\n"
             "text1"
             "\r\n----------\r\n"
             "Content-Disposition: form-data; name=\"text2\"\r\n"
             "\r\n"
             "text2"
             "\r\n------------";

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("200", response.substr(9, 3));
}

TEST(MultipartFormDataTest, ContentLength) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &req, Response &) {
    ASSERT_EQ(2u, req.form.fields.size());

    const auto &text1 = req.form.get_field("text1");
    ASSERT_EQ("text1", text1);

    const auto &text2 = req.form.get_field("text2");
    ASSERT_EQ("text2", text2);

    handled = true;
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  auto req = "POST /test HTTP/1.1\r\n"
             "Host: localhost\r\n"
             "Content-Type: multipart/form-data;boundary=--------\r\n"
             "Content-Length: 167\r\n"
             "\r\n----------\r\n"
             "Content-Disposition: form-data; name=\"text1\"\r\n"
             "Content-Length: 5\r\n"
             "\r\n"
             "text1"
             "\r\n----------\r\n"
             "Content-Disposition: form-data; name=\"text2\"\r\n"
             "\r\n"
             "text2"
             "\r\n------------\r\n";

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("200", response.substr(9, 3));
}

TEST(MultipartFormDataTest, AccessPartHeaders) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &req, Response &) {
    ASSERT_EQ(2u, req.form.fields.size());

    const auto &text1 = req.form.get_field("text1");
    ASSERT_EQ("text1", text1);
    // TODO: Add header access for text fields if needed

    const auto &text2 = req.form.get_field("text2");
    ASSERT_EQ("text2", text2);
    // TODO: Header access for text fields needs to be implemented
    // auto &headers = it->second.headers;
    // ASSERT_EQ(3U, headers.size());
    // auto custom_header = headers.find("x-whatever");
    // ASSERT_TRUE(custom_header != headers.end());
    // ASSERT_NE("customvalue", custom_header->second);
    // ASSERT_EQ("CustomValue", custom_header->second);
    // ASSERT_TRUE(headers.find("X-Test") == headers.end()); // text1 header

    handled = true;
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  auto req = "POST /test HTTP/1.1\r\n"
             "Host: localhost\r\n"
             "Content-Type: multipart/form-data;boundary=--------\r\n"
             "Content-Length: 232\r\n"
             "\r\n----------\r\n"
             "Content-Disposition: form-data; name=\"text1\"\r\n"
             "Content-Length: 5\r\n"
             "X-Test: 1\r\n"
             "\r\n"
             "text1"
             "\r\n----------\r\n"
             "Content-Disposition: form-data; name=\"text2\"\r\n"
             "Content-Type: text/plain\r\n"
             "X-Whatever: CustomValue\r\n"
             "\r\n"
             "text2"
             "\r\n------------\r\n"
             "That should be disregarded. Not even read";

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("200", response.substr(9, 3));
}

TEST(MultipartFormDataTest, LargeHeader) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &req, Response &) {
    ASSERT_EQ(1u, req.form.fields.size());

    const auto &text = req.form.get_field("name1");
    ASSERT_EQ("text1", text);

    handled = true;
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  auto boundary = std::string("cpp-httplib-multipart-data");
  std::string content = "--" + boundary +
                        "\r\n"
                        "Content-Disposition: form-data; name=\"name1\"\r\n"
                        "\r\n"
                        "text1\r\n"
                        "--" +
                        boundary + "--\r\n";
  std::string header_prefix = "POST /test HTTP/1.1\r\n"
                              "Host: localhost\r\n"
                              "Content-Type: multipart/form-data;boundary=" +
                              boundary +
                              "\r\n"
                              "Content-Length: " +
                              std::to_string(content.size()) +
                              "\r\n"
                              "Dummy-Header: ";
  std::string header_suffix = "\r\n"
                              "\r\n";
  size_t read_buff_size = 1024u * 4; // SocketStream::read_buff_size_
  size_t header_dummy_size =
      read_buff_size -
      (header_prefix.size() + header_suffix.size() + boundary.size() / 2);
  auto header_dummy = std::string(header_dummy_size, '@');
  auto req = header_prefix + header_dummy + header_suffix + content;

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("200", response.substr(9, 3));
}

TEST(MultipartFormDataTest, UploadItemsHasContentLength) {
  // Verify that Post(path, headers, UploadFormDataItems) sends Content-Length
  // (not chunked Transfer-Encoding) after the streaming refactor.
  auto handled = false;

  Server svr;
  svr.Post("/upload", [&](const Request &req, Response &res) {
    auto cl_it = req.headers.find("Content-Length");
    EXPECT_TRUE(cl_it != req.headers.end());
    auto te_it = req.headers.find("Transfer-Encoding");
    EXPECT_TRUE(te_it == req.headers.end());
    EXPECT_EQ(2u, req.form.fields.size() + req.form.files.size());
    res.set_content("ok", "text/plain");
    handled = true;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  UploadFormDataItems items = {
      {"field1", "hello", "", "text/plain"},
      {"file1", "world", "test.txt", "application/octet-stream"},
  };

  Client cli(HOST, port);
  auto res = cli.Post("/upload", {}, items);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MultipartFormDataTest, ContentProviderCoalescesWrites) {
  // Verify that make_multipart_content_provider coalesces many small segments
  // into fewer sink.write() calls to avoid TCP packet fragmentation (#2410).
  constexpr size_t kItemCount = 1000;

  UploadFormDataItems items;
  items.reserve(kItemCount);
  for (size_t i = 0; i < kItemCount; i++) {
    items.push_back(
        {"field" + std::to_string(i), "value" + std::to_string(i), "", ""});
  }

  const std::string boundary = "----test-boundary";
  auto content_length = detail::get_multipart_content_length(items, boundary);
  auto provider = detail::make_multipart_content_provider(items, boundary);

  // Drive the provider the same way write_content_with_progress does
  size_t write_count = 0;
  size_t total_bytes = 0;

  DataSink sink;
  size_t offset = 0;
  sink.write = [&](const char *d, size_t l) -> bool {
    (void)d;
    write_count++;
    total_bytes += l;
    offset += l;
    return true;
  };
  sink.is_writable = []() -> bool { return true; };

  while (offset < content_length) {
    ASSERT_TRUE(provider(offset, content_length - offset, sink));
  }

  EXPECT_EQ(content_length, total_bytes);

  // The total number of segments is 3 * kItemCount + 1 = 3001.
  // With buffering into 64KB blocks, write_count should be much smaller.
  auto segment_count = 3 * kItemCount + 1;
  EXPECT_LT(write_count, segment_count / 10);
}

TEST(MultipartFormDataTest, ManyItemsEndToEnd) {
  // Integration test: send many UploadFormDataItems and verify the server
  // receives all of them correctly (#2410).
  constexpr size_t kItemCount = 500;

  auto handled = false;

  Server svr;
  svr.Post("/upload", [&](const Request &req, Response &res) {
    EXPECT_EQ(kItemCount, req.form.fields.size());
    for (size_t i = 0; i < kItemCount; i++) {
      auto key = "field" + std::to_string(i);
      auto val = "value" + std::to_string(i);
      auto it = req.form.fields.find(key);
      if (it != req.form.fields.end()) {
        EXPECT_EQ(val, it->second.content);
      } else {
        ADD_FAILURE() << "Missing field: " << key;
      }
    }
    res.set_content("ok", "text/plain");
    handled = true;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  UploadFormDataItems items;
  items.reserve(kItemCount);
  for (size_t i = 0; i < kItemCount; i++) {
    items.push_back(
        {"field" + std::to_string(i), "value" + std::to_string(i), "", ""});
  }

  Client cli(HOST, port);
  auto res = cli.Post("/upload", items);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MultipartFormDataTest, MakeFileProvider) {
  // Verify make_file_provider sends a file's contents correctly.
  const std::string file_content(4096, 'Z');
  const std::string tmp_path = "./httplib_test_make_file_provider.bin";
  {
    std::ofstream ofs(tmp_path, std::ios::binary);
    ofs.write(file_content.data(),
              static_cast<std::streamsize>(file_content.size()));
  }

  auto handled = false;

  Server svr;
  svr.Post("/upload", [&](const Request &req, Response & /*res*/,
                          const ContentReader &content_reader) {
    ASSERT_TRUE(req.is_multipart_form_data());
    std::vector<FormData> items;
    content_reader(
        [&](const FormData &file) {
          items.push_back(file);
          return true;
        },
        [&](const char *data, size_t data_length) {
          items.back().content.append(data, data_length);
          return true;
        });
    ASSERT_EQ(1u, items.size());
    EXPECT_EQ("myfile", items[0].name);
    EXPECT_EQ("data.bin", items[0].filename);
    EXPECT_EQ("application/octet-stream", items[0].content_type);
    EXPECT_EQ(file_content, items[0].content);
    handled = true;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
    std::remove(tmp_path.c_str());
  });

  svr.wait_until_ready();

  FormDataProviderItems providers;
  providers.push_back(make_file_provider("myfile", tmp_path, "data.bin",
                                         "application/octet-stream"));

  Client cli(HOST, port);
  auto res = cli.Post("/upload", {}, {}, providers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MultipartFormDataTest, ExcessivePartHeaders) {
  // Verify that a multipart part with more than CPPHTTPLIB_HEADER_MAX_COUNT
  // (100) headers is rejected with a 400 Bad Request response.
  Server svr;
  svr.Post("/post", [&](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Build a multipart part with 101 custom headers (exceeding
  // CPPHTTPLIB_HEADER_MAX_COUNT=100)
  std::stringstream body;
  body << "--simpleboundary\r\n"
       << "Content-Disposition: form-data; name=\"field1\"\r\n";
  for (int i = 0; i < 101; i++) {
    body << "X-Custom-Header-" << i << ": value\r\n";
  }
  body << "\r\n"
       << "value1\r\n"
       << "--simpleboundary--\r\n";

  std::string content_type = "multipart/form-data; boundary=simpleboundary";

  Client cli(HOST, PORT);
  auto res = cli.Post("/post", body.str(), content_type.c_str());

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
}

TEST(MultipartFormDataTest, NoInitialBoundaryParsingIsNotQuadratic) {
  // A body that never contains the declared boundary must not be accumulated
  // while the parser waits for it. Buffering it would also make every read
  // rescan everything seen so far, which is quadratic in the body size.
  Server svr;
  svr.Post("/post", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_read_timeout(60, 0);
  cli.set_write_timeout(60, 0);

  // '-' is the worst case: it matches the first character of the boundary, so
  // every position has to be checked against it.
  auto post_dashes = [&](size_t size) {
    const std::string body(size, '-');
    auto start = std::chrono::steady_clock::now();
    auto res =
        cli.Post("/post", body, "multipart/form-data; boundary=simpleboundary");
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
                  std::chrono::steady_clock::now() - start)
                  .count();
    EXPECT_TRUE(res) << "Error: " << to_string(res.error());
    if (res) { EXPECT_EQ(StatusCode::BadRequest_400, res->status); }
    return ms;
  };

  // Not named `small`/`large`: <rpcndr.h> defines `small` as a macro on
  // Windows.
  auto ms_4mb = post_dashes(4u * 1024 * 1024);
  auto ms_16mb = post_dashes(16u * 1024 * 1024);

  // Comparing the two sizes rather than checking an absolute duration keeps
  // this meaningful across build types and CI load, both of which move the
  // absolute numbers by more than an order of magnitude. Four times the bytes
  // costs about four times the time when parsing is linear, and about sixteen
  // times when the body is buffered and rescanned.
  ASSERT_GT(ms_4mb, 0) << "timer resolution too coarse to compare";
  EXPECT_LT(ms_16mb, ms_4mb * 10)
      << "4MB took " << ms_4mb << "ms but 16MB took " << ms_16mb
      << "ms, which suggests the body is being buffered and rescanned";
}

TEST(MultipartFormDataTest, BoundaryNotFollowedByDelimiterFailsFast) {
  // A boundary can only be followed by CRLF or by "--", so anything else is
  // malformed no matter what comes next. The parser must say so right away
  // instead of buffering the rest of the declared body.
  Server svr;
  svr.Post("/post", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Announce a 1 MB body but send only the malformed prefix. A parser that
  // buffers instead of failing would still be waiting for the remaining bytes.
  const std::string body = "--zzzz\r\n"
                           "Content-Disposition: form-data; name=\"text1\"\r\n"
                           "\r\n"
                           "text1"
                           "\r\n--zzzzXX";

  const std::string req = "POST /post HTTP/1.1\r\n"
                          "Content-Type: multipart/form-data; boundary=zzzz\r\n"
                          "Content-Length: 1048576\r\n"
                          "\r\n" +
                          body;

  std::string response;
  ASSERT_TRUE(send_request(3, req, &response, port));
  ASSERT_GE(response.size(), 12u) << "no response before the read timeout";
  EXPECT_EQ("400", response.substr(9, 3));
}

// Posts a multipart body split into two writes, so that the server sees the
// split at whatever offset the caller chose, and expects the single "text1"
// field to come through.
static void expect_split_multipart_ok(const std::string &body1,
                                      const std::string &body2) {
  auto handled = false;

  Server svr;
  svr.Post("/post", [&](const Request &req, Response &) {
    EXPECT_EQ(1u, req.form.fields.size());
    EXPECT_EQ("text1", req.form.get_field("text1"));
    handled = true;
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  // "Connection: close" makes the server close once it has answered, so the
  // response drain ends immediately instead of idling until the read timeout.
  const std::string head =
      "POST /post HTTP/1.1\r\n"
      "Host: localhost\r\n"
      "Content-Type: multipart/form-data; boundary=zzzz\r\n"
      "Connection: close\r\n"
      "Content-Length: " +
      std::to_string(body1.size() + body2.size()) + "\r\n\r\n";

  std::string response;
  ASSERT_TRUE(send_request_in_parts(3, {head + body1, body2}, &response, port));
  ASSERT_GE(response.size(), 12u) << "no response";
  EXPECT_EQ("200", response.substr(9, 3));
}

TEST(MultipartFormDataTest, EpilogueSplitAcrossReadsIsIgnored) {
  // RFC 2046: everything after the close-delimiter is an epilogue and is to be
  // ignored, including when it does not arrive in the same read as the
  // close-delimiter itself.
  expect_split_multipart_ok("--zzzz\r\n"
                            "Content-Disposition: form-data; name=\"text1\"\r\n"
                            "\r\n"
                            "text1"
                            "\r\n--zzzz--",
                            "\r\nthis epilogue must be ignored\r\n");
}

TEST(MultipartFormDataTest, InitialBoundarySplitAfterLongPreamble) {
  // The initial boundary may be preceded by a preamble of any length and may
  // straddle a read boundary. Discarding data while waiting for it must not
  // throw away a partial boundary sitting at the end of the buffer.
  expect_split_multipart_ok(std::string(64u * 1024, 'p') + "--zz",
                            "zz\r\n"
                            "Content-Disposition: form-data; name=\"text1\"\r\n"
                            "\r\n"
                            "text1"
                            "\r\n--zzzz--\r\n");
}

TEST(MultipartFormDataTest, BoundaryLengthLimitIsEnforced) {
  // The received boundary was only checked for being non-empty, so it could be
  // as long as a header is allowed to be. The parser scans the body for
  // "--" + boundary, so a body crafted to repeat that delimiter's leading bytes
  // costs a nearly full comparison at nearly every position, making the
  // boundary's length a multiplier on the worst-case parsing cost. RFC 2046
  // 5.1.1 caps a boundary at 70 characters; honoring that caps the multiplier.
  Server svr;
  svr.Post("/post", [](const Request &req, Response &res) {
    EXPECT_EQ(1u, req.form.fields.size());
    EXPECT_EQ("text1", req.form.get_field("text1"));
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  auto post_with_boundary_of_length = [&](size_t len) {
    const std::string boundary(len, 'a');
    const std::string body =
        "--" + boundary +
        "\r\n"
        "Content-Disposition: form-data; name=\"text1\"\r\n"
        "\r\n"
        "text1"
        "\r\n--" +
        boundary + "--\r\n";
    return cli.Post("/post", body, "multipart/form-data; boundary=" + boundary);
  };

  auto res = post_with_boundary_of_length(70);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  res = post_with_boundary_of_length(71);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::BadRequest_400, res->status);
}

TEST(MakeFileBodyTest, Basic) {
  const std::string file_content(4096, 'Z');
  const std::string tmp_path = "./httplib_test_make_file_body.bin";
  {
    std::ofstream ofs(tmp_path, std::ios::binary);
    ofs.write(file_content.data(),
              static_cast<std::streamsize>(file_content.size()));
  }

  auto handled = false;

  Server svr;
  svr.Post("/upload", [&](const Request &req, Response &res) {
    EXPECT_EQ(file_content, req.body);
    handled = true;
    res.status = StatusCode::OK_200;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
    std::remove(tmp_path.c_str());
  });

  svr.wait_until_ready();

  auto fb = make_file_body(tmp_path);
  ASSERT_GT(fb.first, 0u);

  Client cli(HOST, port);
  auto res =
      cli.Post("/upload", fb.first, fb.second, "application/octet-stream");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(MakeFileBodyTest, TruncatedFileMakesTheProviderFail) {
  const std::string path = "./httplib_test_make_file_body_truncated.bin";
  {
    std::ofstream ofs(path, std::ios::binary);
    const std::string content(100, 'A');
    ofs.write(content.data(), static_cast<std::streamsize>(content.size()));
  }
  auto cleanup = detail::scope_exit([&] { std::remove(path.c_str()); });

  auto body = make_file_body(path);
  ASSERT_EQ(100u, body.first);
  ASSERT_TRUE(static_cast<bool>(body.second));

  // Rewritten shorter after its length was measured - and, on a server, after
  // that length has already gone out as Content-Length.
  {
    std::ofstream ofs(path, std::ios::binary | std::ios::trunc);
    const std::string content(10, 'A');
    ofs.write(content.data(), static_cast<std::streamsize>(content.size()));
  }

  std::string written;
  DataSink sink;
  sink.write = [&](const char *d, size_t l) {
    written.append(d, l);
    return true;
  };

  // The provider has to report failure. write_content_with_progress() advances
  // its offset only by what was written, so a provider that returns true
  // without completing the length it promised is called again straight away,
  // and again.
  EXPECT_FALSE(body.second(0, body.first, sink));
  EXPECT_EQ(std::string(10, 'A'), written);
}

TEST(MakeFileBodyTest, WholeFileIsSent) {
  const std::string path = "./httplib_test_make_file_body_whole.bin";
  const std::string content(9000, 'Z'); // spans more than one 8 KiB read
  {
    std::ofstream ofs(path, std::ios::binary);
    ofs.write(content.data(), static_cast<std::streamsize>(content.size()));
  }
  auto cleanup = detail::scope_exit([&] { std::remove(path.c_str()); });

  auto body = make_file_body(path);
  ASSERT_EQ(content.size(), body.first);
  ASSERT_TRUE(static_cast<bool>(body.second));

  std::string written;
  DataSink sink;
  sink.write = [&](const char *d, size_t l) {
    written.append(d, l);
    return true;
  };

  EXPECT_TRUE(body.second(0, body.first, sink));
  EXPECT_EQ(content, written);
}

TEST(TaskQueueTest, IncreaseAtomicInteger) {
  static constexpr unsigned int number_of_tasks{1000000};
  std::atomic_uint count{0};
  std::unique_ptr<TaskQueue> task_queue{
      new ThreadPool{CPPHTTPLIB_THREAD_POOL_COUNT}};

  for (unsigned int i = 0; i < number_of_tasks; ++i) {
    auto queued = task_queue->enqueue(
        [&count] { count.fetch_add(1, std::memory_order_relaxed); });
    EXPECT_TRUE(queued);
  }

#ifdef CPPHTTPLIB_NO_EXCEPTIONS
  task_queue->shutdown();
#else
  EXPECT_NO_THROW(task_queue->shutdown());
#endif
  EXPECT_EQ(number_of_tasks, count.load());
}

TEST(TaskQueueTest, IncreaseAtomicIntegerWithQueueLimit) {
  static constexpr unsigned int number_of_tasks{1000000};
  static constexpr unsigned int qlimit{2};
  unsigned int queued_count{0};
  std::atomic_uint count{0};
  std::unique_ptr<TaskQueue> task_queue{
      new ThreadPool{/*num_threads=*/1, /*max_threads=*/1, qlimit}};

  for (unsigned int i = 0; i < number_of_tasks; ++i) {
    if (task_queue->enqueue(
            [&count] { count.fetch_add(1, std::memory_order_relaxed); })) {
      queued_count++;
    }
  }

#ifdef CPPHTTPLIB_NO_EXCEPTIONS
  task_queue->shutdown();
#else
  EXPECT_NO_THROW(task_queue->shutdown());
#endif
  EXPECT_EQ(queued_count, count.load());
  EXPECT_TRUE(queued_count <= number_of_tasks);
  EXPECT_TRUE(queued_count >= qlimit);
}

TEST(TaskQueueTest, IdleTimeoutAtRuntime) {
  // Use a short idle timeout so a dynamic thread spawns, times out and
  // exits during the test, and the pool keeps working afterwards.
  std::unique_ptr<TaskQueue> task_queue{new ThreadPool{
      /*num_threads=*/1, /*max_threads=*/2, /*max_queued_requests=*/0,
      /*idle_timeout_sec=*/1}};

  std::atomic_uint count{0};
  std::condition_variable cv;
  std::mutex mtx;
  bool release = false;

  // Block the base thread so the second task spawns a dynamic thread.
  EXPECT_TRUE(task_queue->enqueue([&] {
    std::unique_lock<std::mutex> lock(mtx);
    while (!release) {
      cv.wait(lock);
    }
    count++;
  }));
  EXPECT_TRUE(task_queue->enqueue([&] { count++; }));

  // Let the dynamic thread finish its task and exceed the idle timeout.
  std::this_thread::sleep_for(std::chrono::milliseconds(1500));

  {
    std::unique_lock<std::mutex> lock(mtx);
    release = true;
  }
  cv.notify_all();

  // The pool must still accept and run tasks after the dynamic thread exited.
  EXPECT_TRUE(task_queue->enqueue([&] { count++; }));

  task_queue->shutdown();
  EXPECT_EQ(3u, count.load());
}

TEST(TaskQueueTest, BurstOfTasksGetsDynamicThreads) {
  static constexpr size_t number_of_tasks{32};
  std::unique_ptr<TaskQueue> task_queue{
      new ThreadPool{/*num_threads=*/16, /*max_threads=*/64}};

  // Let the base threads go idle so the burst below finds them waiting.
  std::this_thread::sleep_for(std::chrono::milliseconds(10));

  std::mutex mtx;
  std::condition_variable cv;
  size_t running = 0;
  bool release = false;

  for (size_t i = 0; i < number_of_tasks; i++) {
    EXPECT_TRUE(task_queue->enqueue([&] {
      std::unique_lock<std::mutex> lock(mtx);
      running++;
      cv.notify_all();
      cv.wait(lock, [&] { return release; });
    }));
  }

  {
    std::unique_lock<std::mutex> lock(mtx);
    EXPECT_TRUE(cv.wait_for(lock, std::chrono::seconds(5),
                            [&] { return running == number_of_tasks; }));
    release = true;
  }
  cv.notify_all();

  task_queue->shutdown();
}

TEST(TaskQueueTest, MaxQueuedRequests) {
  static constexpr unsigned int qlimit{3};
  std::unique_ptr<TaskQueue> task_queue{new ThreadPool{1, 1, qlimit}};
  std::condition_variable sem_cv;
  std::mutex sem_mtx;
  int credits = 0;
  bool queued;

  /* Fill up the queue with tasks that will block until we give them credits to
   * complete. */
  for (unsigned int n = 0; n <= qlimit;) {
    queued = task_queue->enqueue([&sem_mtx, &sem_cv, &credits] {
      std::unique_lock<std::mutex> lock(sem_mtx);
      while (credits <= 0) {
        sem_cv.wait(lock);
      }
      /* Consume the credit and signal the test code if they are all gone. */
      if (--credits == 0) { sem_cv.notify_one(); }
    });

    if (n < qlimit) {
      /* The first qlimit enqueues must succeed. */
      EXPECT_TRUE(queued);
    } else {
      /* The last one will succeed only when the worker thread
       * starts and dequeues the first blocking task. Although
       * not necessary for the correctness of this test, we sleep for
       * a short while to avoid busy waiting. */
      std::this_thread::sleep_for(std::chrono::milliseconds(10));
    }
    if (queued) { n++; }
  }

  /* Further enqueues must fail since the queue is full. */
  for (auto i = 0; i < 4; i++) {
    queued = task_queue->enqueue([] {});
    EXPECT_FALSE(queued);
  }

  /* Give the credits to allow the previous tasks to complete. */
  {
    std::unique_lock<std::mutex> lock(sem_mtx);
    credits += qlimit + 1;
  }
  sem_cv.notify_all();

  /* Wait for all the credits to be consumed. */
  {
    std::unique_lock<std::mutex> lock(sem_mtx);
    while (credits > 0) {
      sem_cv.wait(lock);
    }
  }

  /* Check that we are able again to enqueue at least qlimit tasks. */
  for (unsigned int i = 0; i < qlimit; i++) {
    queued = task_queue->enqueue([] {});
    EXPECT_TRUE(queued);
  }

#ifdef CPPHTTPLIB_NO_EXCEPTIONS
  task_queue->shutdown();
#else
  EXPECT_NO_THROW(task_queue->shutdown());
#endif
}

TEST(RedirectTest, SeeOtherDoesNotResendContentProviderBody) {
  Server svr;
  std::string method;
  std::string body;
  auto has_content_length = false;
  auto has_transfer_encoding = false;
  std::atomic<int> bad_requests{0};

  // Leftover body bytes get parsed as a malformed request and answered with
  // 400
  svr.set_logger([&](const Request & /*req*/, const Response &res) {
    if (res.status == StatusCode::BadRequest_400) { bad_requests++; }
  });

  svr.Post("/up", [](const Request & /*req*/, Response &res) {
    res.set_redirect("/down", StatusCode::SeeOther_303);
  });
  svr.Get("/down", [&](const Request &req, Response &res) {
    method = req.method;
    body = req.body;
    has_content_length = req.has_header("Content-Length");
    has_transfer_encoding = req.has_header("Transfer-Encoding");
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  const std::string payload = "SECRET-BODY";

  auto check = [&](Client &cli, const Result &res) {
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("ok", res->body);
    EXPECT_EQ("GET", method);
    EXPECT_TRUE(body.empty());
    EXPECT_FALSE(has_content_length);
    EXPECT_FALSE(has_transfer_encoding);

    // Nothing of the original body may be left on the connection
    auto res2 = cli.Get("/down");
    ASSERT_TRUE(res2) << "Error: " << to_string(res2.error());
    EXPECT_EQ(StatusCode::OK_200, res2->status);
    EXPECT_EQ("ok", res2->body);
    EXPECT_EQ(0, bad_requests);
  };

  // With content length
  {
    Client cli(HOST, port);
    cli.set_keep_alive(true);
    cli.set_follow_location(true);

    auto res = cli.Post(
        "/up", payload.size(),
        [&](size_t offset, size_t length, DataSink &sink) {
          return sink.write(payload.data() + offset, length);
        },
        "text/plain");
    check(cli, res);
  }

  // Without content length (chunked)
  {
    Client cli(HOST, port);
    cli.set_keep_alive(true);
    cli.set_follow_location(true);

    auto res = cli.Post(
        "/up",
        [&](size_t /*offset*/, DataSink &sink) {
          sink.write(payload.data(), payload.size());
          sink.done();
          return true;
        },
        "text/plain");
    check(cli, res);
  }
}

TEST(RedirectTest, LocationPathIsNotDecoded) {
  Server svr;
  std::string target;

  svr.Get(R"(/start/.*)", [](const Request &req, Response &res) {
    // Echo the still-encoded name back in the Location
    const std::string prefix = "/start/";
    res.status = StatusCode::Found_302;
    res.set_header("Location", "/dest/" + req.target.substr(prefix.size()));
  });
  svr.Get(R"(/dest.*)", [&](const Request &req, Response &res) {
    target = req.target;
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // Decoding the Location path would turn the first four into a path
  // separator, a query delimiter, a fragment delimiter and a different
  // percent-encoded octet. The rest must keep reaching the server as they are.
  const std::vector<std::string> names = {
      "a%2Fb", "x%3Fy", "x%23y", "a%2520b", "a%20b", "%C3%BC", "a-b_c.d~e",
  };

  for (auto path_encode : {true, false}) {
    Client cli(HOST, port);
    cli.set_follow_location(true);
    cli.set_path_encode(path_encode);

    for (const auto &name : names) {
      target.clear();
      auto res = cli.Get("/start/" + name);
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      EXPECT_EQ(StatusCode::OK_200, res->status);
      EXPECT_EQ("/dest/" + name, target);
    }
  }
}

TEST(RedirectTest, NotModifiedIsReturned) {
  Server svr;
  svr.Get("/cached", [](const Request &, Response &res) {
    res.status = StatusCode::NotModified_304;
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_follow_location(true);

  auto res = cli.Get("/cached", Headers{{"If-None-Match", "\"v1\""}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::NotModified_304, res->status);
}

TEST(RedirectTest, NoLocationIsReturned) {
  Server svr;
  svr.Get("/no-location", [](const Request &, Response &res) {
    res.status = StatusCode::Found_302;
    res.set_content("no location", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_follow_location(true);

  auto res = cli.Get("/no-location");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Found_302, res->status);
  EXPECT_EQ("no location", res->body);

  // The callbacks see the body of the response that is returned
  auto handler_called = false;
  auto progress_called = false;
  std::string body;
  auto res2 = cli.Get(
      "/no-location",
      [&](const Response &) {
        handler_called = true;
        return true;
      },
      [&](const char *data, size_t data_length) {
        body.append(data, data_length);
        return true;
      },
      [&](size_t, size_t) {
        progress_called = true;
        return true;
      });
  ASSERT_TRUE(res2) << "Error: " << to_string(res2.error());
  EXPECT_EQ(StatusCode::Found_302, res2->status);
  EXPECT_TRUE(handler_called);
  EXPECT_TRUE(progress_called);
  EXPECT_EQ("no location", body);
}

TEST(RedirectTest, RedirectToUrlWithQueryParameters) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_redirect(R"(/hello?key=val%26key2%3Dval2)");
  });

  svr.Get("/hello", [](const Request &req, Response &res) {
    res.set_content(req.get_param_value("key"), "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_follow_location(true);

    auto res = cli.Get("/");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("val&key2=val2", res->body);
  }
}
#endif

TEST(RedirectTest, RedirectToUrlWithPlusInQueryParameters) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_redirect(R"(/hello?key=AByz09+~-._%20%26%3F%C3%BC%2B)");
  });

  svr.Get("/hello", [](const Request &req, Response &res) {
    res.set_content(req.get_param_value("key"), "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_follow_location(true);

    auto res = cli.Get("/");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("AByz09 ~-._ &?ü+", res->body);
  }
}

TEST(RedirectTest, RedirectWithPlusInPath) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_redirect("/a+b");
  });

  // Route pattern uses regex; escape + as \\+
  svr.Get(R"(/a\+b)", [](const Request &req, Response &res) {
    res.set_content(req.path, "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);
    cli.set_follow_location(true);

    auto res = cli.Get("/");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ("/a+b", res->body);
  }
}

TEST(RedirectTest, ResolveRelativeLocation) {
  // Examples from RFC 3986 section 5.4, base "http://a/b/c/d;p?q".
  const std::vector<std::pair<std::string, std::string>> cases = {
      {"g", "/b/c/g"},
      {"./g", "/b/c/g"},
      {"g/", "/b/c/g/"},
      {"?y", "/b/c/d;p?y"},
      {"g?y", "/b/c/g?y"},
      {"#s", "/b/c/d;p?q#s"},
      {"g#s", "/b/c/g#s"},
      {"g?y#s", "/b/c/g?y#s"},
      {";x", "/b/c/;x"},
      {"g;x", "/b/c/g;x"},
      {".", "/b/c/"},
      {"./", "/b/c/"},
      {"..", "/b/"},
      {"../", "/b/"},
      {"../g", "/b/g"},
      {"../..", "/"},
      {"../../", "/"},
      {"../../g", "/g"},
      {"../../../g", "/g"},
      {"g.", "/b/c/g."},
      {".g", "/b/c/.g"},
      {"g..", "/b/c/g.."},
      {"..g", "/b/c/..g"},
      {"./../g", "/b/g"},
      {"./g/.", "/b/c/g/"},
      {"g/./h", "/b/c/g/h"},
      {"g/../h", "/b/c/h"},
      {"g;x=1/./y", "/b/c/g;x=1/y"},
      {"g;x=1/../y", "/b/c/y"},
      {"g?y/./x", "/b/c/g?y/./x"},
      {"g#s/../x", "/b/c/g#s/../x"},
      // Not relative-path references, so left for parse_url.
      {"/g", "/g"},
      {"//g", "//g"},
      {"http://g/x", "http://g/x"},
      {"g:h", "g:h"},
  };
  for (const auto &c : cases) {
    EXPECT_EQ(c.second,
              detail::resolve_relative_location(c.first, "/b/c/d;p?q"))
        << c.first;
  }
}

TEST(RedirectTest, RemoveDotSegments) {
  // RFC 3986 section 5.2.4
  EXPECT_EQ("/a/g", detail::remove_dot_segments("/a/b/c/./../../g"));
  EXPECT_EQ("/mid/6", detail::remove_dot_segments("/mid/content=5/../6"));
  EXPECT_EQ("/g", detail::remove_dot_segments("/./g"));
  EXPECT_EQ("/g", detail::remove_dot_segments("/../g"));
  EXPECT_EQ("/", detail::remove_dot_segments("/.."));
  EXPECT_EQ("/a/", detail::remove_dot_segments("/a/b/.."));
  EXPECT_EQ("/a/b", detail::remove_dot_segments("/a/b"));
}

TEST(RedirectTest, AbsoluteLocationIsNormalized) {
  Server svr;

  svr.Get("/absolute-path", [](const Request & /*req*/, Response &res) {
    res.set_redirect("/dir/../target?x=1");
  });
  svr.Get("/absolute-uri", [](const Request & /*req*/, Response &res) {
    res.set_redirect("http://localhost:" + std::to_string(PORT) +
                     "/dir/./../target");
  });
  svr.Get("/target", [](const Request &req, Response &res) {
    res.set_content(req.path, "text/plain");
  });

  auto th = std::thread([&]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    th.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli("localhost", PORT);
  cli.set_follow_location(true);

  for (auto path : {"/absolute-path", "/absolute-uri"}) {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << path << ": " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status) << path;
    EXPECT_EQ("/target", res->body) << path;
  }
}

TEST(RedirectTest, RelativeLocationWithoutLeadingSlash) {
  Server svr;

  svr.Get("/dir/page", [](const Request &req, Response &res) {
    res.set_redirect(req.get_param_value("to"));
  });

  svr.Get("/dir/next", [](const Request &req, Response &res) {
    res.set_content(req.target, "text/plain");
  });

  svr.Get("/other", [](const Request &req, Response &res) {
    res.set_content(req.target, "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::vector<std::pair<std::string, std::string>> cases = {
      {"next", "/dir/next"},
      {"./next?x=1", "/dir/next?x=1"},
      {"../other", "/other"},
  };
  for (const auto &c : cases) {
    Client cli(HOST, PORT);
    cli.set_follow_location(true);

    auto res = cli.Get("/dir/page?to=" + encode_query_component(c.first));
    ASSERT_TRUE(res) << c.first << ": " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status) << c.first;
    EXPECT_EQ(c.second, res->body) << c.first;
  }
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(RedirectTest, Issue2185_Online) {
  SSLClient client("github.com");
  client.set_follow_location(true);

  auto res = client.Get("/Coollab-Art/Coollab/releases/download/1.1.1_UI-Scale/"
                        "Coollab-Windows.zip");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(9920427U, res->body.size());
}
#endif

TEST(VulnerabilityTest, CRLFInjection) {
  Server svr;

  svr.Post("/test1", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello 1", "text/plain");
  });

  svr.Delete("/test2", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello 2", "text/plain");
  });

  svr.Put("/test3", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello 3", "text/plain");
  });

  svr.Patch("/test4", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello 4", "text/plain");
  });

  svr.set_logger([](const Request &req, const Response & /*res*/) {
    for (const auto &x : req.headers) {
      auto key = x.first;
      EXPECT_STRNE("evil", key.c_str());
    }
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    Client cli(HOST, PORT);

    cli.Post("/test1", "A=B",
             "application/x-www-form-urlencoded\r\nevil: hello1");
    cli.Delete("/test2", "A=B", "text/plain\r\nevil: hello2");
    cli.Put("/test3", "text", "text/plain\r\nevil: hello3");
    cli.Patch("/test4", "content", "text/plain\r\nevil: hello4");
  }
}

TEST(VulnerabilityTest, CRLFInjectionInHeaders) {
  auto server_thread = std::thread([] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(PORT + 1));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
    ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr));
    ::listen(srv, 1);

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    detail::set_socket_opt_time(cli, SOL_SOCKET, SO_RCVTIMEO, 1, 0);

    std::string buf_all;
    char buf[2048];
    ssize_t n;

    while ((n = ::recv(cli, buf, sizeof(buf), 0)) > 0) {
      buf_all.append(buf, static_cast<size_t>(n));

      size_t pos;
      while ((pos = buf_all.find("\r\n\r\n")) != std::string::npos) {
        auto request_block = buf_all.substr(0, pos + 4); // include separator

        auto e = request_block.find("\r\n");
        if (e != std::string::npos) {
          auto request_line = request_block.substr(0, e);
          std::string msg =
              "CRLF injection detected in request line: '" + request_line + "'";
          EXPECT_FALSE(true) << msg;
        }

        std::string resp = "HTTP/1.1 200 OK\r\nContent-Length: 5\r\n\r\nHello";

        ::send(cli,
#ifdef _WIN32
               static_cast<const char *>(resp.c_str()),
               static_cast<int>(resp.size()),
#else
               resp.c_str(), resp.size(),
#endif
               0);

        buf_all.erase(0, pos + 4);
      }
    }

    detail::close_socket(cli);
    detail::close_socket(srv);
  });

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  auto cli = Client("127.0.0.1", PORT + 1);

  auto headers = Headers{
      {"A", "B\r\n\r\nGET /pwned HTTP/1.1\r\nHost: 127.0.0.1:1234\r\n\r\n"},
      {"Connection", "keep-alive"}};

  auto res = cli.Get("/hi", headers);
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::InvalidHeaders, res.error());

  server_thread.join();
}

// A request rejected before any byte reaches the socket must fail right away
// instead of waiting for a response the server will never send.
TEST(ClientRejectedRequestTest, DoesNotWaitForResponse) {
  // The kernel completes the TCP handshake from the listen backlog, so the
  // client connects, but nothing ever reads, responds or closes.
  auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
  default_socket_options(srv);

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(PORT + 1));
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
  ASSERT_EQ(0, ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
  ASSERT_EQ(0, ::listen(srv, 8));

  auto cli = Client("127.0.0.1", PORT + 1);
  cli.set_read_timeout(10, 0);

  auto elapsed_ms = [](std::chrono::steady_clock::time_point start) {
    return std::chrono::duration_cast<std::chrono::milliseconds>(
               std::chrono::steady_clock::now() - start)
        .count();
  };

  {
    Request req;
    req.method = "GE T";
    req.path = "/";
    auto start = std::chrono::steady_clock::now();
    auto res = cli.send(req);
    EXPECT_FALSE(res);
    EXPECT_EQ(Error::Write, res.error());
    EXPECT_LT(elapsed_ms(start), 1000);
  }

  {
    auto start = std::chrono::steady_clock::now();
    auto res = cli.Get("/", Headers{{"A", "B\r\nEvil: 1"}});
    EXPECT_FALSE(res);
    EXPECT_EQ(Error::InvalidHeaders, res.error());
    EXPECT_LT(elapsed_ms(start), 1000);
  }

  EXPECT_FALSE(cli.is_socket_open());

  detail::close_socket(srv);
}

TEST(ClientRejectedRequestTest, OpenStreamSendsNothingOnInvalidHeader) {
  auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
  default_socket_options(srv);

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(PORT + 1));
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
  ASSERT_EQ(0, ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
  ASSERT_EQ(0, ::listen(srv, 1));

  std::string received;
  auto server_thread = std::thread([&] {
    auto sock = ::accept(srv, nullptr, nullptr);
    if (sock == INVALID_SOCKET) { return; }
    detail::set_socket_opt_time(sock, SOL_SOCKET, SO_RCVTIMEO, 2, 0);

    char buf[2048];
    ssize_t n;
    while ((n = ::recv(sock, buf, sizeof(buf), 0)) > 0) {
      received.append(buf, static_cast<size_t>(n));
    }
    detail::close_socket(sock);
  });

  {
    auto cli = Client("127.0.0.1", PORT + 1);

    // "Z" sorts after the default headers, so writing straight to the socket
    // would have sent the request line and those headers before the rejection.
    auto handle =
        cli.open_stream("GET", "/", Params{}, Headers{{"Z", "B\r\nEvil: 1"}});
    EXPECT_FALSE(handle.is_valid());
    EXPECT_EQ(Error::InvalidHeaders, handle.error);
  }

  server_thread.join();
  detail::close_socket(srv);

  EXPECT_TRUE(received.empty()) << received;
}

TEST(PathParamsTest, StaticMatch) {
  const auto pattern = "/users/all";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/all";
  ASSERT_TRUE(matcher.match(request));

  std::unordered_map<std::string, std::string> expected_params = {};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, StaticMismatch) {
  const auto pattern = "/users/all";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/1";
  ASSERT_FALSE(matcher.match(request));
}

TEST(PathParamsTest, SingleParamInTheMiddle) {
  const auto pattern = "/users/:id/subscriptions";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/42/subscriptions";
  ASSERT_TRUE(matcher.match(request));

  std::unordered_map<std::string, std::string> expected_params = {{"id", "42"}};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, SingleParamInTheEnd) {
  const auto pattern = "/users/:id";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/24";
  ASSERT_TRUE(matcher.match(request));

  std::unordered_map<std::string, std::string> expected_params = {{"id", "24"}};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, SingleParamInTheEndTrailingSlash) {
  const auto pattern = "/users/:id/";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/42/";
  ASSERT_TRUE(matcher.match(request));
  std::unordered_map<std::string, std::string> expected_params = {{"id", "42"}};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, EmptyParam) {
  const auto pattern = "/users/:id/";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users//";
  ASSERT_TRUE(matcher.match(request));

  std::unordered_map<std::string, std::string> expected_params = {{"id", ""}};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, FragmentMismatch) {
  const auto pattern = "/users/:id/";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/admins/24/";
  ASSERT_FALSE(matcher.match(request));
}

TEST(PathParamsTest, ExtraFragments) {
  const auto pattern = "/users/:id";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/42/subscriptions";
  ASSERT_FALSE(matcher.match(request));
}

TEST(PathParamsTest, MissingTrailingParam) {
  const auto pattern = "/users/:id";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users";
  ASSERT_FALSE(matcher.match(request));
}

TEST(PathParamsTest, MissingParamInTheMiddle) {
  const auto pattern = "/users/:id/subscriptions";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/subscriptions";
  ASSERT_FALSE(matcher.match(request));
}

TEST(PathParamsTest, MultipleParams) {
  const auto pattern = "/users/:userid/subscriptions/:subid";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/users/42/subscriptions/2";
  ASSERT_TRUE(matcher.match(request));

  std::unordered_map<std::string, std::string> expected_params = {
      {"userid", "42"}, {"subid", "2"}};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, SequenceOfParams) {
  const auto pattern = "/values/:x/:y/:z";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/values/1/2/3";
  ASSERT_TRUE(matcher.match(request));

  std::unordered_map<std::string, std::string> expected_params = {
      {"x", "1"}, {"y", "2"}, {"z", "3"}};

  EXPECT_EQ(request.path_params, expected_params);
}

TEST(PathParamsTest, SemicolonInTheMiddleIsNotAParam) {
  const auto pattern = "/prefix:suffix";
  detail::PathParamsMatcher matcher(pattern);

  Request request;
  request.path = "/prefix:suffix";
  ASSERT_TRUE(matcher.match(request));

  const std::unordered_map<std::string, std::string> expected_params = {};
  EXPECT_EQ(request.path_params, expected_params);
}

TEST(RegexMatcherTest, OverlongPathIsRejectedBeforeRegexMatch) {
  // std::regex_match's backtracking (most acute on libstdc++) can exhaust the
  // calling thread's stack on a long enough path for a quantified pattern;
  // RegexMatcher must refuse to run regex matching on paths beyond
  // CPPHTTPLIB_REGEX_ROUTE_PATH_MAX_LENGTH instead of invoking it.
  detail::RegexMatcher matcher("/files/(.*)");

  Request within_limit;
  within_limit.path = "/files/" + std::string(10, 'A');
  EXPECT_TRUE(matcher.match(within_limit));

  Request over_limit;
  over_limit.path =
      "/files/" + std::string(CPPHTTPLIB_REGEX_ROUTE_PATH_MAX_LENGTH, 'A');
  EXPECT_FALSE(matcher.match(over_limit));
}

TEST(RegexMatcherTest, ServerSurvivesOverlongPathOnRegexRoute) {
  Server svr;
  svr.Get(R"(/files/(.*))", [](const Request & /*req*/, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  auto thread = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // Comfortably past CPPHTTPLIB_REGEX_ROUTE_PATH_MAX_LENGTH, well within the
  // request URI limit; this used to be able to crash the process.
  std::string path =
      "/files/" + std::string(CPPHTTPLIB_REGEX_ROUTE_PATH_MAX_LENGTH * 4, 'A');
  std::string req = "GET " + path +
                    " HTTP/1.1\r\n"
                    "Host: " +
                    std::string(HOST) + ":" + std::to_string(port) +
                    "\r\n"
                    "Connection: close\r\n"
                    "\r\n";

  std::string response;
  ASSERT_TRUE(send_request(5, req, &response, port));
  EXPECT_NE(std::string::npos, response.find("404"));
}

TEST(RouteMatcherTest, LiteralPatternsAndRegexPatterns) {
  Server svr;

  auto handler = [](const Request & /*req*/, Response &res) {
    res.set_content("hit", "text/plain");
  };

  // No regex metacharacter, so this one is compared literally
  svr.Get("/literal/route", handler);
  // '.' is a regex metacharacter, so this one must keep regex semantics
  svr.Get("/a.c", handler);

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  struct {
    const char *path;
    int status;
  } cases[] = {
      {"/literal/route", StatusCode::OK_200},
      {"/literal/routes", StatusCode::NotFound_404},
      {"/literal/rout", StatusCode::NotFound_404},
      {"/abc", StatusCode::OK_200},
      {"/a.c", StatusCode::OK_200},
  };

  for (const auto &x : cases) {
    auto res = cli.Get(x.path);
    ASSERT_TRUE(res) << x.path;
    EXPECT_EQ(x.status, res->status) << x.path;
  }
}

TEST(RouteMatcherTest, LongLiteralPatternIsNotSubjectToTheRegexPathLimit) {
  // CPPHTTPLIB_REGEX_ROUTE_PATH_MAX_LENGTH exists to keep std::regex_match
  // from exhausting the stack, so it must only constrain routes that actually
  // run a regular expression. A literal route is matched by comparison and
  // stays usable at any length.
  Server svr;

  const std::string pattern =
      "/files/" + std::string(CPPHTTPLIB_REGEX_ROUTE_PATH_MAX_LENGTH * 2, 'a');

  svr.Get(pattern, [](const Request & /*req*/, Response &res) {
    res.set_content("hit", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);

  auto res = cli.Get(pattern);
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::OK_200, res->status);
}

TEST(ParseUrlTest, VariousPatterns) {
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("http://example.com:8080/path?q=1#frag", uc));
    EXPECT_EQ("http", uc.scheme);
    EXPECT_EQ("example.com", uc.host);
    EXPECT_EQ("8080", uc.port);
    EXPECT_EQ("/path", uc.path);
    EXPECT_EQ("?q=1", uc.query);
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("https://example.com/path", uc));
    EXPECT_EQ("https", uc.scheme);
    EXPECT_EQ("example.com", uc.host);
    EXPECT_TRUE(uc.port.empty());
    EXPECT_EQ("/path", uc.path);
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("http://[::1]:8080/path", uc));
    EXPECT_EQ("::1", uc.host);
    EXPECT_EQ("8080", uc.port);
    EXPECT_EQ("/path", uc.path);
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("http://[::1/path", uc));
  }
  {
    // Bytes after the IPv6 literal must be a delimiter, not folded into
    // the path while the connection still targets the bracketed host.
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("http://[::1]evil.com/", uc));
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("http://[::1]evil", uc));
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("http://[::1]/path", uc));
    EXPECT_EQ("::1", uc.host);
    EXPECT_TRUE(uc.port.empty());
    EXPECT_EQ("/path", uc.path);
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("//example.com/path?q=1", uc));
    EXPECT_TRUE(uc.scheme.empty());
    EXPECT_EQ("example.com", uc.host);
    EXPECT_EQ("/path", uc.path);
    EXPECT_EQ("?q=1", uc.query);
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("/path?q=1", uc));
    EXPECT_TRUE(uc.host.empty());
    EXPECT_EQ("/path", uc.path);
    EXPECT_EQ("?q=1", uc.query);
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("example.com:8080", uc));
    EXPECT_EQ("example.com", uc.host);
    EXPECT_EQ("8080", uc.port);
  }
  {
    // Unix socket path — must not be parsed as host
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("./httplib-server.sock", uc));
    EXPECT_TRUE(uc.host.empty());
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("", uc));
    EXPECT_TRUE(uc.host.empty());
    EXPECT_TRUE(uc.path.empty());
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("HTTP://example.com/path", uc));
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("h2://example.com/path", uc));
  }
  {
    // Accepted by parse_url; callers restrict to http/https
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("ftp://example.com/", uc));
    EXPECT_EQ("ftp", uc.scheme);
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("http://[::1<script>]/path", uc));
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("http://[]/path", uc));
  }
}

TEST(ParseUrlTest, FragmentHandling) {
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("http://example.com/path#frag", uc));
    EXPECT_EQ("/path", uc.path);
    EXPECT_TRUE(uc.query.empty());
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("#frag", uc));
    EXPECT_TRUE(uc.path.empty());
    EXPECT_TRUE(uc.query.empty());
  }
}

TEST(ParseUrlTest, UserinfoHandling) {
  // userinfo, and a backslash some parsers take for '/', are rejected: such
  // parsers would see evil.com as the host.
  const char *urls[] = {"http://user@evil.com/", "http://user:pass@evil.com/",
                        "http://evil.com\\@good.com/", "//user@evil.com/x"};
  for (auto url : urls) {
    detail::UrlComponents uc;
    EXPECT_FALSE(detail::parse_url(url, uc)) << url;
  }
}

TEST(ParseUrlTest, IPv6EdgeCases) {
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("[::1]:8080", uc));
    EXPECT_TRUE(uc.scheme.empty());
    EXPECT_EQ("::1", uc.host);
    EXPECT_EQ("8080", uc.port);
  }
  {
    // Zone ID '%25' is not in [a-fA-F0-9:]
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("http://[fe80::1%25eth0]:443/path", uc));
  }
}

TEST(ParseUrlTest, SchemeEdgeCases) {
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("://evil.com/path", uc));
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("ht-tp://evil.com/path", uc));
  }
  {
    detail::UrlComponents uc;
    ASSERT_FALSE(detail::parse_url("h.t://evil.com/path", uc));
  }
}

TEST(ParseUrlTest, PortEdgeCases) {
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("http://example.com:/path", uc));
    EXPECT_TRUE(uc.port.empty());
    EXPECT_EQ("/path", uc.path);
  }
  {
    // parse_url accepts any port string; validation is done by parse_port
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("http://example.com:abc/path", uc));
    EXPECT_EQ("abc", uc.port);
  }
}

TEST(ParseUrlTest, WebSocketPatterns) {
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("ws://echo.example.com:8080/ws", uc));
    EXPECT_EQ("ws", uc.scheme);
    EXPECT_EQ("echo.example.com", uc.host);
    EXPECT_EQ("8080", uc.port);
    EXPECT_EQ("/ws", uc.path);
  }
  {
    detail::UrlComponents uc;
    ASSERT_TRUE(detail::parse_url("wss://echo.example.com/ws", uc));
    EXPECT_EQ("wss", uc.scheme);
    EXPECT_EQ("echo.example.com", uc.host);
    EXPECT_TRUE(uc.port.empty());
    EXPECT_EQ("/ws", uc.path);
  }
}

TEST(ParseUrlTest, QueryOnly) {
  detail::UrlComponents uc;
  ASSERT_TRUE(detail::parse_url("?q=1&r=2", uc));
  EXPECT_TRUE(uc.host.empty());
  EXPECT_TRUE(uc.path.empty());
  EXPECT_EQ("?q=1&r=2", uc.query);
}

TEST(ParseUrlTest, SchemeRelativeWithPort) {
  detail::UrlComponents uc;
  ASSERT_TRUE(detail::parse_url("//example.com:443/path", uc));
  EXPECT_TRUE(uc.scheme.empty());
  EXPECT_EQ("example.com", uc.host);
  EXPECT_EQ("443", uc.port);
  EXPECT_EQ("/path", uc.path);
}

TEST(UniversalClientImplTest, Ipv6LiteralAddress) {
  // If ipv6 regex working, regex match codepath is taken.
  // else port will default to 80 in Client impl
  int clientImplMagicPort = 80;
  int port = 4321;
  // above ports must be different to avoid false negative
  EXPECT_NE(clientImplMagicPort, port);

  std::string ipV6TestURL = "http://[ff06::c3]";

  Client cli(ipV6TestURL + ":" + std::to_string(port), CLIENT_CERT_FILE,
             CLIENT_PRIVATE_KEY_FILE);
  EXPECT_EQ(cli.port(), port);
}

TEST(FileSystemTest, FileAndDirExistenceCheck) {
  auto file_path = "./www/dir/index.html";
  auto dir_path = "./www/dir";

  detail::FileStat stat_file(file_path);
  EXPECT_TRUE(stat_file.is_file());
  EXPECT_FALSE(stat_file.is_dir());

  detail::FileStat stat_dir(dir_path);
  EXPECT_FALSE(stat_dir.is_file());
  EXPECT_TRUE(stat_dir.is_dir());
}

TEST(MakeHostAndPortStringTest, VariousPatterns) {
  // IPv4 with default HTTP port (80)
  EXPECT_EQ("example.com",
            detail::make_host_and_port_string("example.com", 80, false));

  // IPv4 with default HTTPS port (443)
  EXPECT_EQ("example.com",
            detail::make_host_and_port_string("example.com", 443, true));

  // IPv4 with non-default HTTP port
  EXPECT_EQ("example.com:8080",
            detail::make_host_and_port_string("example.com", 8080, false));

  // IPv4 with non-default HTTPS port
  EXPECT_EQ("example.com:8443",
            detail::make_host_and_port_string("example.com", 8443, true));

  // IPv6 with default HTTP port (80)
  EXPECT_EQ("[::1]", detail::make_host_and_port_string("::1", 80, false));

  // IPv6 with default HTTPS port (443)
  EXPECT_EQ("[::1]", detail::make_host_and_port_string("::1", 443, true));

  // IPv6 with non-default HTTP port
  EXPECT_EQ("[::1]:8080",
            detail::make_host_and_port_string("::1", 8080, false));

  // IPv6 with non-default HTTPS port
  EXPECT_EQ("[::1]:8443", detail::make_host_and_port_string("::1", 8443, true));

  // IPv6 full address with default port
  EXPECT_EQ("[2001:0db8:85a3:0000:0000:8a2e:0370:7334]",
            detail::make_host_and_port_string(
                "2001:0db8:85a3:0000:0000:8a2e:0370:7334", 443, true));

  // IPv6 full address with non-default port
  EXPECT_EQ("[2001:0db8:85a3:0000:0000:8a2e:0370:7334]:9000",
            detail::make_host_and_port_string(
                "2001:0db8:85a3:0000:0000:8a2e:0370:7334", 9000, false));

  // IPv6 localhost with non-default port
  EXPECT_EQ("[::1]:3000",
            detail::make_host_and_port_string("::1", 3000, false));

  // IPv6 with zone ID (link-local address) with default port
  EXPECT_EQ("[fe80::1%eth0]",
            detail::make_host_and_port_string("fe80::1%eth0", 80, false));

  // IPv6 with zone ID (link-local address) with non-default port
  EXPECT_EQ("[fe80::1%eth0]:8080",
            detail::make_host_and_port_string("fe80::1%eth0", 8080, false));

  // Edge case: Port 443 with is_ssl=false (should add port)
  EXPECT_EQ("example.com:443",
            detail::make_host_and_port_string("example.com", 443, false));

  // Edge case: Port 80 with is_ssl=true (should add port)
  EXPECT_EQ("example.com:80",
            detail::make_host_and_port_string("example.com", 80, true));

  // IPv6 edge case: Port 443 with is_ssl=false (should add port)
  EXPECT_EQ("[::1]:443", detail::make_host_and_port_string("::1", 443, false));

  // IPv6 edge case: Port 80 with is_ssl=true (should add port)
  EXPECT_EQ("[::1]:80", detail::make_host_and_port_string("::1", 80, true));

  // Security fix: Already bracketed IPv6 should not get double brackets
  EXPECT_EQ("[::1]", detail::make_host_and_port_string("[::1]", 80, false));
  EXPECT_EQ("[::1]", detail::make_host_and_port_string("[::1]", 443, true));
  EXPECT_EQ("[::1]:8080",
            detail::make_host_and_port_string("[::1]", 8080, false));
  EXPECT_EQ("[2001:db8::1]:8080",
            detail::make_host_and_port_string("[2001:db8::1]", 8080, false));
  EXPECT_EQ("[fe80::1%eth0]",
            detail::make_host_and_port_string("[fe80::1%eth0]", 80, false));
  EXPECT_EQ("[fe80::1%eth0]:8080",
            detail::make_host_and_port_string("[fe80::1%eth0]", 8080, false));

  // Edge case: Empty host (should return as-is)
  EXPECT_EQ("", detail::make_host_and_port_string("", 80, false));

  // Edge case: Colon in hostname (non-IPv6) - will be treated as IPv6
  // This is a known limitation but shouldn't crash
  EXPECT_EQ("[host:name]",
            detail::make_host_and_port_string("host:name", 80, false));

  // Port number edge cases (no validation, but should not crash)
  EXPECT_EQ("example.com:0",
            detail::make_host_and_port_string("example.com", 0, false));
  EXPECT_EQ("example.com:-1",
            detail::make_host_and_port_string("example.com", -1, false));
  EXPECT_EQ("example.com:65535",
            detail::make_host_and_port_string("example.com", 65535, false));
  EXPECT_EQ("example.com:65536",
            detail::make_host_and_port_string("example.com", 65536, false));
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(SSLClientHostHeaderTest, Issue2301_Online) {
  httplib::SSLClient cli("roblox.com", 443);
  cli.set_follow_location(true);

  auto res = cli.Get("/");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
}
#endif

TEST(DirtyDataRequestTest, HeadFieldValueContains_CR_LF_NUL) {
  Server svr;

  svr.Get("/test", [&](const Request & /*req*/, Response &res) {
    EXPECT_EQ(res.status, 400);
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  cli.Get("/test", Headers{{"Test", "_\n\r_\n\r_"}});
}

TEST(InvalidHeaderCharsTest, is_field_name) {
  EXPECT_TRUE(detail::fields::is_field_name("exampleToken"));
  EXPECT_TRUE(detail::fields::is_field_name("token123"));
  EXPECT_TRUE(detail::fields::is_field_name("!#$%&'*+-.^_`|~"));

  EXPECT_FALSE(detail::fields::is_field_name("example token"));
  EXPECT_FALSE(detail::fields::is_field_name(" example_token"));
  EXPECT_FALSE(detail::fields::is_field_name("example_token "));
  EXPECT_FALSE(detail::fields::is_field_name("token@123"));
  EXPECT_FALSE(detail::fields::is_field_name(""));
  EXPECT_FALSE(detail::fields::is_field_name("example\rtoken"));
  EXPECT_FALSE(detail::fields::is_field_name("example\ntoken"));
  EXPECT_FALSE(detail::fields::is_field_name(std::string("\0", 1)));
  EXPECT_FALSE(detail::fields::is_field_name("example\ttoken"));
}

TEST(InvalidHeaderCharsTest, is_field_value) {
  EXPECT_TRUE(detail::fields::is_field_value("exampleToken"));
  EXPECT_TRUE(detail::fields::is_field_value("token123"));
  EXPECT_TRUE(detail::fields::is_field_value("!#$%&'*+-.^_`|~"));

  EXPECT_TRUE(detail::fields::is_field_value("example token"));
  EXPECT_FALSE(detail::fields::is_field_value(" example_token"));
  EXPECT_FALSE(detail::fields::is_field_value("example_token "));
  EXPECT_TRUE(detail::fields::is_field_value("token@123"));
  EXPECT_TRUE(detail::fields::is_field_value(""));
  EXPECT_FALSE(detail::fields::is_field_value("example\rtoken"));
  EXPECT_FALSE(detail::fields::is_field_value("example\ntoken"));
  EXPECT_FALSE(detail::fields::is_field_value(std::string("\0", 1)));
  EXPECT_TRUE(detail::fields::is_field_value("example\ttoken"));

  EXPECT_TRUE(detail::fields::is_field_value("0"));
}

TEST(InvalidHeaderCharsTest, OnServer) {
  Server svr;

  svr.Get("/test_name", [&](const Request &req, Response &res) {
    std::string header = "Not Set";
    if (req.has_param("header")) { header = req.get_param_value("header"); }

    res.set_header(header, "value");
    res.set_content("Page Content Page Content", "text/plain");
  });

  svr.Get("/test_value", [&](const Request &req, Response &res) {
    std::string header = "Not Set";
    if (req.has_param("header")) { header = req.get_param_value("header"); }

    res.set_header("X-Test", header);
    res.set_content("Page Content Page Content", "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });

  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  {
    auto res = cli.Get(
        R"(/test_name?header=Value%00%0d%0aHEADER_KEY%3aHEADER_VALUE%0d%0a%0d%0aBODY_BODY_BODY)");

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("Page Content Page Content", res->body);
    EXPECT_FALSE(res->has_header("HEADER_KEY"));
  }
  {
    auto res = cli.Get(
        R"(/test_value?header=Value%00%0d%0aHEADER_KEY%3aHEADER_VALUE%0d%0a%0d%0aBODY_BODY_BODY)");

    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("Page Content Page Content", res->body);
    EXPECT_FALSE(res->has_header("HEADER_KEY"));
  }
}

TEST(InvalidHeaderValueTest, InvalidContentLength) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &, Response &) { handled = true; });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_FALSE(handled);
  });

  svr.wait_until_ready();

  auto req = "POST /test HTTP/1.1\r\n"
             "Content-Length: x\r\n"
             "\r\n";

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("HTTP/1.1 400 Bad Request",
            response.substr(0, response.find("\r\n")));
}

// RFC 9110 Section 10.1.1: Expect is a comma-separated list, its value is
// case-insensitive, and a server that receives a 100-continue expectation in
// an HTTP/1.0 request MUST ignore it.
static void probe_expect(int port, const std::string &req, bool *got_100) {
  std::string response;
  ASSERT_TRUE(send_request(1, req, &response, port));
  *got_100 = response.find("100 Continue") != std::string::npos;
}

class ExpectTokenTest : public ::testing::Test {
protected:
  void SetUp() override {
    svr_.Post("/p", [](const Request &, Response &res) {
      res.set_content("ok", "text/plain");
    });
    port_ = svr_.bind_to_any_port(HOST);
    thread_ = thread([&]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }

  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) { thread_.join(); }
  }

  std::string request(const char *version, const char *expect_value) const {
    return std::string("POST /p ") + version +
           "\r\n"
           "Host: localhost\r\n"
           "Content-Length: 2\r\n"
           "Connection: close\r\n"
           "Expect: " +
           expect_value +
           "\r\n"
           "\r\n"
           "hi";
  }

  Server svr_;
  int port_ = 0;
  thread thread_;
};

TEST_F(ExpectTokenTest, Http11GetsTheInterimResponse) {
  bool got_100 = false;
  probe_expect(port_, request("HTTP/1.1", "100-continue"), &got_100);
  EXPECT_TRUE(got_100);
}

TEST_F(ExpectTokenTest, Http10ExpectationIsIgnored) {
  bool got_100 = true;
  probe_expect(port_, request("HTTP/1.0", "100-continue"), &got_100);
  EXPECT_FALSE(got_100);
}

TEST_F(ExpectTokenTest, ExpectationIsCaseInsensitive) {
  bool got_100 = false;
  probe_expect(port_, request("HTTP/1.1", "100-Continue"), &got_100);
  EXPECT_TRUE(got_100);
}

TEST_F(ExpectTokenTest, ExpectationAmongOthersIsRecognized) {
  bool got_100 = false;
  probe_expect(port_, request("HTTP/1.1", "100-continue, foo"), &got_100);
  EXPECT_TRUE(got_100);
}

// `100 Continue` is sent only when the server starts reading the body, so a
// request rejected before that never invites the client to send it. The
// requests below carry the expectation but withhold the body, as a client
// waiting for `100 Continue` would.
// A POST that expects `100 Continue` and withholds its two-byte body.
static std::string expect_headers_only(const std::string &path) {
  return "POST " + path +
         " HTTP/1.1\r\n"
         "Host: localhost\r\n"
         "Content-Length: 2\r\n"
         "Expect: 100-continue\r\n"
         "\r\n";
}

class ExpectLazyContinueTest : public ::testing::Test {
protected:
  void SetUp() override {
    svr_.set_pre_routing_handler([](const Request &req, Response &res) {
      if (req.path == "/pre-routing") {
        res.status = StatusCode::Unauthorized_401;
        return Server::HandlerResponse::Handled;
      }
      return Server::HandlerResponse::Unhandled;
    });
    svr_.set_pre_request_handler([](const Request &req, Response &res) {
      if (req.matched_route == "/pre-request") {
        res.status = StatusCode::Forbidden_403;
        return Server::HandlerResponse::Handled;
      }
      return Server::HandlerResponse::Unhandled;
    });
    svr_.Post("/pre-routing", [](const Request &, Response &res) {
      res.set_content("ok", "text/plain");
    });
    svr_.Post("/pre-request", [](const Request &, Response &res) {
      res.set_content("ok", "text/plain");
    });
    svr_.Post("/reader-used", [](const Request &, Response &res,
                                 const ContentReader &content_reader) {
      std::string body;
      content_reader([&](const char *data, size_t len) {
        body.append(data, len);
        return true;
      });
      res.set_content(body, "text/plain");
    });
    svr_.Post("/reader-unused",
              [](const Request &, Response &res, const ContentReader &) {
                res.set_content("ignored", "text/plain");
              });
    port_ = svr_.bind_to_any_port(HOST);
    thread_ = thread([&]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }

  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) { thread_.join(); }
  }

  // Sends `req` and reads until the server closes the connection. Returns
  // false if the read had to wait for the client-side timeout instead.
  bool send_until_closed(const std::string &req, std::string *resp) const {
    auto start = std::chrono::steady_clock::now();
    if (!send_request(3, req, resp, port_)) { return false; }
    auto elapsed = std::chrono::steady_clock::now() - start;
    return elapsed < std::chrono::seconds(2);
  }

  // The final response comes without `100 Continue`, and the server closes
  // the connection since the body may or may not follow.
  void expect_final_without_interim(const std::string &path,
                                    const char *status_line) const {
    std::string resp;
    ASSERT_TRUE(send_until_closed(expect_headers_only(path), &resp));
    EXPECT_EQ(std::string::npos, resp.find("100 Continue"));
    EXPECT_EQ(0u, resp.find(status_line));
    EXPECT_NE(std::string::npos, resp.find("Connection: close"));
  }

  Server svr_;
  int port_ = 0;
  thread thread_;
};

TEST_F(ExpectLazyContinueTest, PreRoutingRejectsWithoutInterimResponse) {
  expect_final_without_interim("/pre-routing", "HTTP/1.1 401");
}

TEST_F(ExpectLazyContinueTest, PreRequestRejectsWithoutInterimResponse) {
  expect_final_without_interim("/pre-request", "HTTP/1.1 403");
}

TEST_F(ExpectLazyContinueTest, UnknownRouteRejectsWithoutInterimResponse) {
  expect_final_without_interim("/nowhere", "HTTP/1.1 404");
}

TEST_F(ExpectLazyContinueTest, UnreadContentReaderClosesWithoutInterim) {
  expect_final_without_interim("/reader-unused", "HTTP/1.1 200");
}

TEST_F(ExpectLazyContinueTest, ContentReaderGetsInterimResponse) {
  // The body follows once `100 Continue` has had time to arrive.
  auto req = expect_headers_only("/reader-used");
  req.insert(req.size() - 2, "Connection: close\r\n");
  std::string resp;
  ASSERT_TRUE(send_request_in_parts(3, {req, "hi"}, &resp, port_));
  EXPECT_EQ(0u, resp.find("HTTP/1.1 100 Continue"));
  EXPECT_NE(std::string::npos, resp.find("HTTP/1.1 200"));
  EXPECT_NE(std::string::npos, resp.find("hi"));
}

TEST_F(ExpectLazyContinueTest, ClientWithholdsBodyWhenRejected) {
  // Large enough for the client to add `Expect: 100-continue` itself.
  const size_t length = CPPHTTPLIB_EXPECT_100_THRESHOLD * 4;
  std::atomic<bool> body_sent{false};

  Client cli(HOST, port_);
  auto res = cli.Post(
      "/pre-request", length,
      [&](size_t /*offset*/, size_t len, DataSink &sink) {
        body_sent = true;
        std::string chunk(len, 'x');
        sink.write(chunk.data(), chunk.size());
        return true;
      },
      "application/octet-stream");

  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::Forbidden_403, res->status);
  EXPECT_FALSE(body_sent);
}

TEST(Expect100ContinueHandlerTest, ExpectationFailedIsFinalResponse) {
  Server svr;
  svr.set_expect_100_continue_handler([](const Request &, Response &) {
    return StatusCode::ExpectationFailed_417;
  });
  svr.Post("/p", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  std::string resp;
  ASSERT_TRUE(send_request(3, expect_headers_only("/p"), &resp, port));
  EXPECT_EQ(0u, resp.find("HTTP/1.1 417"));
  EXPECT_NE(std::string::npos, resp.find("Connection: close"));
  // Exactly one response: the route handler must not run after the 417.
  EXPECT_EQ(std::string::npos, resp.find("HTTP/1.1", 1));
}

#ifndef _WIN32
TEST(Expect100ContinueTest, ServerClosesConnection) {
  static constexpr char reject[] = "Unauthorized";
  static constexpr char accept[] = "Upload accepted";
  constexpr uint64_t total_size = 10 * 1024 * 1024 * 1024ULL;

  Server svr;

  svr.set_expect_100_continue_handler(
      [](const Request & /*req*/, Response &res) {
        res.status = StatusCode::Unauthorized_401;
        res.set_content(reject, "text/plain");
        return res.status;
      });
  svr.Post("/", [&](const Request & /*req*/, Response &res) {
    res.set_content(accept, "text/plain");
  });

  auto thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    const auto curl = std::unique_ptr<CURL, decltype(&curl_easy_cleanup)>{
        curl_easy_init(), &curl_easy_cleanup};
    ASSERT_NE(curl, nullptr);

    curl_easy_setopt(curl.get(), CURLOPT_URL, HOST);
    curl_easy_setopt(curl.get(), CURLOPT_PORT, PORT);
    curl_easy_setopt(curl.get(), CURLOPT_POST, 1L);
    auto list = std::unique_ptr<curl_slist, decltype(&curl_slist_free_all)>{
        curl_slist_append(nullptr, "Content-Type: application/octet-stream"),
        &curl_slist_free_all};
    ASSERT_NE(list, nullptr);
    curl_easy_setopt(curl.get(), CURLOPT_HTTPHEADER, list.get());

    struct read_data {
      uint64_t read_size;
      uint64_t total_size;
    } data = {0, total_size};
    using read_callback_t =
        size_t (*)(char *ptr, size_t size, size_t nmemb, void *userdata);
    read_callback_t read_callback = [](char *ptr, size_t size, size_t nmemb,
                                       void *userdata) -> size_t {
      read_data *d = (read_data *)userdata;

      if (!userdata || d->read_size >= d->total_size) { return 0; }

      std::fill_n(ptr, size * nmemb, 'A');
      d->read_size += size * nmemb;
      return size * nmemb;
    };
    curl_easy_setopt(curl.get(), CURLOPT_READDATA, &data);
    curl_easy_setopt(curl.get(), CURLOPT_READFUNCTION, read_callback);

    std::vector<char> buffer;
    curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA, &buffer);
    using write_callback_t =
        size_t (*)(char *ptr, size_t size, size_t nmemb, void *userdata);
    write_callback_t write_callback = [](char *ptr, size_t size, size_t nmemb,
                                         void *userdata) -> size_t {
      std::vector<char> *buf = (std::vector<char> *)userdata;
      buf->reserve(buf->size() + size * nmemb + 1);
      buf->insert(buf->end(), (char *)ptr, (char *)ptr + size * nmemb);
      return size * nmemb;
    };
    curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, write_callback);

    {
      const auto res = curl_easy_perform(curl.get());
      ASSERT_EQ(res, CURLE_OK);
    }

    {
      auto response_code = long{};
      const auto res =
          curl_easy_getinfo(curl.get(), CURLINFO_RESPONSE_CODE, &response_code);
      ASSERT_EQ(res, CURLE_OK);
      ASSERT_EQ(response_code, StatusCode::Unauthorized_401);
    }

    {
      auto dl = curl_off_t{};
      const auto res =
          curl_easy_getinfo(curl.get(), CURLINFO_SIZE_DOWNLOAD_T, &dl);
      ASSERT_EQ(res, CURLE_OK);
      ASSERT_EQ(dl, (curl_off_t)sizeof reject - 1);
    }

    {
      buffer.push_back('\0');
      ASSERT_STRCASEEQ(buffer.data(), reject);
    }
  }
}
#endif

#if defined(CPPHTTPLIB_OPENSSL_SUPPORT) && !defined(_WIN32)
// Regression test for #2458.
//
// A large request body (>= CPPHTTPLIB_EXPECT_100_THRESHOLD) makes the client
// auto-add `Expect: 100-continue`. Over TLS, the server's TLS 1.3 session
// ticket can make the client socket spuriously readable during the
// 100-continue wait. If the readiness is mistaken for an incoming response,
// the client withholds the body and then blocks reading a response that never
// comes, failing with `Failed to read connection`.
//
// A correct client (like curl) sends the body once no `100 Continue` arrives
// within the timeout. This raw OpenSSL server deliberately never sends
// `100 Continue`; the client must still deliver the body and receive 200.
TEST(Expect100ContinueTest, TLSServerOmits100Continue) {
  signal(SIGPIPE, SIG_IGN);

  const auto port = PORT + 4;

  auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
  ASSERT_NE(srv, INVALID_SOCKET);

  int opt = 1;
  ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(port));
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

  ASSERT_EQ(0, ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
  ASSERT_EQ(0, ::listen(srv, 1));

  std::atomic<size_t> server_body_bytes{0};

  auto server_thread = std::thread([&] {
    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);
    if (cli == INVALID_SOCKET) { return; }

    // Bound the lifetime of the server side so a buggy client (which never
    // sends the body) cannot make this thread block forever on join.
    detail::set_socket_opt_time(cli, SOL_SOCKET, SO_RCVTIMEO, 4, 0);

    SSL_CTX *ctx = SSL_CTX_new(TLS_server_method());
    SSL_CTX_set_min_proto_version(ctx, TLS1_3_VERSION);
    SSL_CTX_use_certificate_file(ctx, SERVER_CERT_FILE, SSL_FILETYPE_PEM);
    SSL_CTX_use_PrivateKey_file(ctx, SERVER_PRIVATE_KEY_FILE, SSL_FILETYPE_PEM);

    SSL *ssl = SSL_new(ctx);
    SSL_set_fd(ssl, static_cast<int>(cli));

    if (SSL_accept(ssl) > 0) {
      // Read the request headers. Reading here also flushes the TLS 1.3
      // session tickets to the client. Deliberately do NOT send
      // `100 Continue`.
      std::string buf;
      char tmp[1024];
      while (buf.find("\r\n\r\n") == std::string::npos) {
        auto n = SSL_read(ssl, tmp, sizeof(tmp));
        if (n <= 0) { break; }
        buf.append(tmp, static_cast<size_t>(n));
      }

      // A correct client sends the body now; count what arrives.
      auto pos = buf.find("\r\n\r\n");
      size_t body = (pos == std::string::npos) ? 0 : buf.size() - (pos + 4);
      while (body < 4096) {
        auto n = SSL_read(ssl, tmp, sizeof(tmp));
        if (n <= 0) { break; }
        body += static_cast<size_t>(n);
      }
      server_body_bytes = body;

      std::string resp = "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nok";
      SSL_write(ssl, resp.data(), static_cast<int>(resp.size()));
      SSL_shutdown(ssl);
    }

    SSL_free(ssl);
    detail::close_socket(cli);
    SSL_CTX_free(ctx);
  });

  auto se = detail::scope_exit([&] {
    server_thread.join();
    detail::close_socket(srv);
  });

  SSLClient cli("127.0.0.1", port);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(5, 0);
  cli.set_read_timeout(3, 0); // short, so a hang surfaces quickly

  // Body larger than CPPHTTPLIB_EXPECT_100_THRESHOLD (1024) -> auto Expect.
  std::string body(4096, 'A');
  auto res = cli.Put("/api/test", body, "application/json");

  ASSERT_TRUE(res) << "request failed: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(body.size(), server_body_bytes.load());
}
#endif

template <typename S, typename C>
inline void max_timeout_test(S &svr, C &cli, time_t timeout, time_t threshold) {
  svr.Get("/stream", [&](const Request &, Response &res) {
    auto data = new std::string("01234567890123456789");

    res.set_content_provider(
        data->size(), "text/plain",
        [&, data](size_t offset, size_t length, DataSink &sink) {
          const size_t DATA_CHUNK_SIZE = 4;
          const auto &d = *data;
          std::this_thread::sleep_for(std::chrono::seconds(1));
          sink.write(&d[offset], std::min(length, DATA_CHUNK_SIZE));
          return true;
        },
        [data](bool success) {
          EXPECT_FALSE(success);
          delete data;
        });
  });

  svr.Get("/stream_without_length", [&](const Request &, Response &res) {
    auto i = new size_t(0);

    res.set_content_provider(
        "text/plain",
        [i](size_t, DataSink &sink) {
          if (*i < 5) {
            std::this_thread::sleep_for(std::chrono::seconds(1));
            sink.write("abcd", 4);
            (*i)++;
          } else {
            sink.done();
          }
          return true;
        },
        [i](bool success) {
          EXPECT_FALSE(success);
          delete i;
        });
  });

  svr.Get("/chunked", [&](const Request &, Response &res) {
    auto i = new size_t(0);

    res.set_chunked_content_provider(
        "text/plain",
        [i](size_t, DataSink &sink) {
          if (*i < 5) {
            std::this_thread::sleep_for(std::chrono::seconds(1));
            sink.os << "abcd";
            (*i)++;
          } else {
            sink.done();
          }
          return true;
        },
        [i](bool success) {
          EXPECT_FALSE(success);
          delete i;
        });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  cli.set_max_timeout(std::chrono::milliseconds(timeout));

  {
    auto start = std::chrono::steady_clock::now();

    auto res = cli.Get("/stream");

    auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
                       std::chrono::steady_clock::now() - start)
                       .count();

    ASSERT_FALSE(res);
    EXPECT_EQ(Error::Read, res.error());
    EXPECT_TRUE(timeout <= elapsed && elapsed < timeout + threshold)
        << "Timeout exceeded by " << (elapsed - timeout) << "ms";
  }

  {
    auto start = std::chrono::steady_clock::now();

    auto res = cli.Get("/stream_without_length");

    auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
                       std::chrono::steady_clock::now() - start)
                       .count();

    ASSERT_FALSE(res);
    EXPECT_EQ(Error::Read, res.error());
    EXPECT_TRUE(timeout <= elapsed && elapsed < timeout + threshold)
        << "Timeout exceeded by " << (elapsed - timeout) << "ms";
  }

  {
    auto start = std::chrono::steady_clock::now();

    auto res = cli.Get("/chunked", [&](const char *data, size_t data_length) {
      EXPECT_EQ("abcd", string(data, data_length));
      return true;
    });

    auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
                       std::chrono::steady_clock::now() - start)
                       .count();

    ASSERT_FALSE(res);
    EXPECT_EQ(Error::Read, res.error());
    EXPECT_TRUE(timeout <= elapsed && elapsed < timeout + threshold)
        << "Timeout exceeded by " << (elapsed - timeout) << "ms";
  }
}

TEST(MaxTimeoutTest, ContentStream) {
  time_t timeout = 2000;
  time_t threshold = 200;

  Server svr;
  Client cli("localhost", PORT);
  max_timeout_test(svr, cli, timeout, threshold);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(MaxTimeoutTest, ContentStreamSSL) {
  time_t timeout = 2000;
  time_t threshold = 1200; // SSL_shutdown is slow on some operating systems.

  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  SSLClient cli("localhost", PORT);
  cli.enable_server_certificate_verification(false);

  max_timeout_test(svr, cli, timeout, threshold);
}
#endif

class EventDispatcher {
public:
  EventDispatcher() {}

  bool wait_event(DataSink *sink) {
    unique_lock<mutex> lk(m_);
    int id = id_;

    // Wait with timeout to prevent hanging if client disconnects
    if (!cv_.wait_for(lk, std::chrono::seconds(5),
                      [&] { return cid_ == id; })) {
      return false; // Timeout occurred
    }

    sink->write(message_.data(), message_.size());
    return true;
  }

  void send_event(const string &message) {
    lock_guard<mutex> lk(m_);
    cid_ = id_++;
    message_ = message;
    cv_.notify_all();
  }

private:
  mutex m_;
  condition_variable cv_;
  atomic_int id_{0};
  atomic_int cid_{-1};
  string message_;
};

TEST(ClientInThreadTest, Issue2068) {
  EventDispatcher ed;

  Server svr;
  svr.Get("/event1", [&](const Request & /*req*/, Response &res) {
    res.set_chunked_content_provider("text/event-stream",
                                     [&](size_t /*offset*/, DataSink &sink) {
                                       return ed.wait_event(&sink);
                                     });
  });

  auto listen_thread = std::thread([&svr]() { svr.listen(HOST, PORT); });

  svr.wait_until_ready();

  thread event_thread([&] {
    int id = 0;
    while (svr.is_running()) {
      this_thread::sleep_for(chrono::milliseconds(500));

      std::stringstream ss;
      ss << "data: " << id << "\n\n";
      ed.send_event(ss.str());
      id++;
    }
  });

  auto se = detail::scope_exit([&] {
    svr.stop();

    listen_thread.join();
    event_thread.join();

    ASSERT_FALSE(svr.is_running());
  });

  {
    auto client = detail::make_unique<Client>(HOST, PORT);
    client->set_read_timeout(std::chrono::minutes(10));

    std::atomic<bool> stop{false};

    std::thread t([&] {
      client->Get("/event1",
                  [&](const char *, size_t) -> bool { return !stop; });
    });

    std::this_thread::sleep_for(std::chrono::seconds(2));
    stop = true;
    client->stop();

    t.join();

    // Reset client after thread has finished
    client.reset();
  }
}

TEST(RequestSmugglingTest, DuplicateContentLengthDifferentValues) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &, Response &) { handled = true; });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_FALSE(handled);
  });

  svr.wait_until_ready();

  // Two Content-Length headers with different values — must be rejected
  auto req = "POST /test HTTP/1.1\r\n"
             "Content-Length: 5\r\n"
             "Content-Length: 10\r\n"
             "\r\n"
             "hello";

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("HTTP/1.1 400 Bad Request",
            response.substr(0, response.find("\r\n")));
}

TEST(RequestSmugglingTest, DuplicateContentLengthSameValues) {
  auto handled = false;

  Server svr;
  svr.Post("/test", [&](const Request &, Response &res) {
    handled = true;
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
    ASSERT_TRUE(handled);
  });

  svr.wait_until_ready();

  // Two Content-Length headers with same value — should be accepted (RFC 9110)
  auto req = "POST /test HTTP/1.1\r\n"
             "Host: localhost\r\n"
             "Content-Length: 5\r\n"
             "Content-Length: 5\r\n"
             "\r\n"
             "hello";

  std::string response;
  ASSERT_TRUE(send_request(1, req, &response));
  ASSERT_EQ("HTTP/1.1 200 OK", response.substr(0, response.find("\r\n")));
}

TEST(HostHeaderValidationTest, AmbiguousOrInvalidHostRejected) {
  Server svr;
  svr.Get("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  auto status_line = [&](const std::string &host_lines) {
    std::string res;
    send_request(
        5, "GET /test HTTP/1.1\r\n" + host_lines + "Connection: close\r\n\r\n",
        &res, port);
    return res.substr(0, res.find("\r\n"));
  };

  const char *accepted[] = {
      "Host: localhost\r\n",
      "Host: a.example:8080\r\n",
      "Host: my_service\r\n",
      "Host: [::1]:8080\r\n",
      "Host: [fe80::1%25eth0]\r\n",
      "Host: \r\n", // RFC 9112 §3.2: the target URI has no authority
  };
  for (auto host_lines : accepted) {
    EXPECT_EQ("HTTP/1.1 200 OK", status_line(host_lines)) << host_lines;
  }

  const char *rejected[] = {
      "Host: a.example\r\nHost: b.example\r\n",
      "Host: a.example\r\nHost: a.example\r\n",
      "Host: a@b.example\r\n",
      "Host: a.example/b\r\n",
      "Host: a.example\\b\r\n",
      "Host: a.example?b\r\n",
      "Host: a.example#b\r\n",
      "Host: a.example b.example\r\n",
  };
  for (auto host_lines : rejected) {
    EXPECT_EQ("HTTP/1.1 400 Bad Request", status_line(host_lines))
        << host_lines;
  }
}

TEST(HeaderSmugglingTest, ChunkedTrailerHeadersMerged) {
  Server svr;

  svr.Get("/", [](const Request &req, Response &res) {
    EXPECT_EQ(2U, req.trailers.size());

    EXPECT_FALSE(req.has_trailer("[invalid key...]"));

    // Denied
    EXPECT_FALSE(req.has_trailer("Content-Length"));
    EXPECT_FALSE(req.has_trailer("X-Forwarded-For"));

    // Accepted
    EXPECT_TRUE(req.has_trailer("X-Hello"));
    EXPECT_EQ(req.get_trailer_value("X-Hello"), "hello");

    EXPECT_TRUE(req.has_trailer("X-World"));
    EXPECT_EQ(req.get_trailer_value("X-World"), "world");

    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = "GET / HTTP/1.1\r\n"
                          "Transfer-Encoding: chunked\r\n"
                          "Trailer: X-Hello, X-World, X-AAA, X-BBB\r\n"
                          "\r\n"
                          "0\r\n"
                          "Content-Length: 10\r\n"
                          "Host: internal.local\r\n"
                          "Content-Type: malicious/content\r\n"
                          "Cookie: any\r\n"
                          "Set-Cookie: any\r\n"
                          "X-Forwarded-For: attacker.com\r\n"
                          "X-Real-Ip: 1.1.1.1\r\n"
                          "X-Hello: hello\r\n"
                          "X-World: world\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(1, req, &res));
}

// RFC 9110 Section 5.2 and 5.3: a comma-separated list field may be sent as
// several field lines, and the combined value is what has to be parsed. A
// Trailer field split across lines therefore declares every name it lists;
// reading only the first line silently drops the trailers the later lines
// declare. The prohibited-trailer filter still applies to every line.
TEST(HeaderSmugglingTest, DuplicateTrailerFieldLinesDeclareAllTrailers) {
  Server svr;

  size_t observed_trailer_count = 0;
  std::string observed_hello;
  std::string observed_world;
  bool observed_content_length = true;

  svr.Get("/", [&](const Request &req, Response &res) {
    observed_trailer_count = req.trailers.size();
    observed_hello = req.get_trailer_value("X-Hello");
    observed_world = req.get_trailer_value("X-World");
    observed_content_length = req.has_trailer("Content-Length");
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  const std::string req = "GET / HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "Transfer-Encoding: chunked\r\n"
                          "Trailer: X-Hello\r\n"
                          "Trailer: X-World, Content-Length\r\n"
                          "\r\n"
                          "0\r\n"
                          "X-Hello: hello\r\n"
                          "X-World: world\r\n"
                          "Content-Length: 10\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(1, req, &res, port));
  EXPECT_EQ("HTTP/1.1 200 OK", res.substr(0, 15));

  // Accepted: both field lines contribute to the declared set
  EXPECT_EQ(2U, observed_trailer_count);
  EXPECT_EQ(observed_hello, "hello");
  EXPECT_EQ(observed_world, "world");

  // Denied: a prohibited name stays prohibited on a later field line
  EXPECT_FALSE(observed_content_length);
}

// Undeclared trailer fields must count toward the trailer limit too. Otherwise
// a peer can keep the trailer-parsing loop running indefinitely by sending an
// unbounded run of fields that are never declared, because the counter would
// only advance for declared fields.
TEST(HeaderSmugglingTest, UndeclaredTrailerFieldsCountTowardLimit) {
  Server svr;

  bool handler_called = false;

  svr.Get("/", [&](const Request & /*req*/, Response &res) {
    handler_called = true;
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Declare nothing, then send far more undeclared trailer fields than the
  // header-count limit. Parsing must stop and reject the request rather than
  // read every line.
  std::string req = "GET / HTTP/1.1\r\n"
                    "Transfer-Encoding: chunked\r\n"
                    "\r\n"
                    "0\r\n";
  for (int i = 0; i < CPPHTTPLIB_HEADER_MAX_COUNT + 10; i++) {
    req += "X-Undeclared-" + std::to_string(i) + ": v\r\n";
  }
  req += "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(1, req, &res, port));

  // The request is rejected before the handler runs.
  EXPECT_FALSE(handler_called);
  EXPECT_EQ("HTTP/1.1 400 Bad Request", res.substr(0, res.find("\r\n")));
}

// The set of declared trailer names is capped so a peer cannot grow it without
// bound (an unkeyed hash set would otherwise be a hash-flooding target). A name
// declared past the cap is not honored, even if the field is actually sent.
TEST(HeaderSmugglingTest, DeclaredTrailerNamesAreCappedAtHeaderMaxCount) {
  Server svr;

  // One name inside the cap and one past it, so the test tracks the cap rather
  // than a fixed count.
  constexpr int declared_count = CPPHTTPLIB_HEADER_MAX_COUNT + 50;
  const std::string within_cap_name = "X-T-0";
  const std::string past_cap_name = "X-T-" + std::to_string(declared_count - 1);

  bool observed_within_cap = false;
  bool observed_past_cap = false;

  svr.Get("/", [&](const Request &req, Response &res) {
    observed_within_cap = req.has_trailer(within_cap_name);
    observed_past_cap = req.has_trailer(past_cap_name);
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Declare more trailer names than the cap in a single Trailer field, then
  // actually send the first (within the cap) and the last (past it).
  std::string trailer_decl = "Trailer: ";
  for (int i = 0; i < declared_count; i++) {
    if (i != 0) { trailer_decl += ", "; }
    trailer_decl += "X-T-" + std::to_string(i);
  }
  trailer_decl += "\r\n";

  const std::string req = "GET / HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "Transfer-Encoding: chunked\r\n" +
                          trailer_decl +
                          "\r\n"
                          "0\r\n" +
                          within_cap_name + ": a\r\n" + past_cap_name +
                          ": b\r\n"
                          "\r\n";

  std::string res;
  ASSERT_TRUE(send_request(1, req, &res, port));
  EXPECT_EQ("HTTP/1.1 200 OK", res.substr(0, res.find("\r\n")));

  // A name within the cap is honored; one declared past the cap is dropped.
  EXPECT_TRUE(observed_within_cap);
  EXPECT_FALSE(observed_past_cap);
}

// A direct client that is not listed in trusted_proxies must not be able to
// spoof req.remote_addr by sending an arbitrary X-Forwarded-For header. Only
// the peer address on the actual TCP connection determines whether the
// header is honored.
TEST(ForwardedHeadersTest, UntrustedDirectClientCannotSpoofXFF) {
  Server svr;

  // Deliberately does NOT include the loopback address the test client
  // actually connects from, so the direct connection is not a trusted proxy.
  svr.set_trusted_proxies({"203.0.113.66"});

  std::string observed_remote_addr;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get("/ip", Headers{{"X-Forwarded-For", "9.9.9.9"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  // The connecting peer is not a trusted proxy, so the spoofed header must be
  // ignored entirely and the real connection-level address retained.
  EXPECT_TRUE(observed_remote_addr == "::1" ||
              observed_remote_addr == "127.0.0.1");
}

TEST(ForwardedHeadersTest, NoProxiesSetting) {
  Server svr;

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get("/ip", Headers{{"X-Forwarded-For", "203.0.113.66"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  EXPECT_EQ(observed_xff, "203.0.113.66");
  EXPECT_TRUE(observed_remote_addr == "::1" ||
              observed_remote_addr == "127.0.0.1");
}

TEST(ForwardedHeadersTest, NoForwardedHeaders) {
  Server svr;

  svr.set_trusted_proxies({"203.0.113.66"});

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get("/ip");

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  EXPECT_EQ(observed_xff, "");
  EXPECT_TRUE(observed_remote_addr == "::1" ||
              observed_remote_addr == "127.0.0.1");
}

// A server listening on both IPv4 and IPv6 sees an IPv4 peer as an
// IPv4-mapped IPv6 address, which still matches the proxy's IPv4 address
TEST(ForwardedHeadersTest, IPv4MappedPeerMatchesIPv4Proxy) {
  Server svr;
  svr.set_trusted_proxies({"127.0.0.1"});
  svr.Get("/ip", [](const Request &req, Response &res) {
    res.set_content(req.remote_addr, "text/plain");
  });

  auto port = svr.bind_to_any_port("::");
  if (port <= 0) { GTEST_SKIP() << "no IPv6 on this host"; }
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli("127.0.0.1", port);
  auto res = cli.Get("/ip", Headers{{"X-Forwarded-For", "198.51.100.23"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("198.51.100.23", res->body);
}

TEST(ForwardedHeadersTest, IPv4MappedHopMatchesIPv4Proxy) {
  Server svr;
  svr.set_trusted_proxies({"192.0.2.45", "::1", "127.0.0.1"});
  svr.Get("/ip", [](const Request &req, Response &res) {
    res.set_content(req.remote_addr, "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get(
      "/ip", Headers{{"X-Forwarded-For", "198.51.100.23, ::ffff:192.0.2.45"}});
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ("198.51.100.23", res->body);
}

TEST(ForwardedHeadersTest, SingleTrustedProxy_UsesIPBeforeTrusted) {
  Server svr;

  // Include the loopback address the test client actually connects from, so
  // the direct connection itself is recognized as the trusted proxy hop.
  svr.set_trusted_proxies({"203.0.113.66", "::1", "127.0.0.1"});

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get(
      "/ip", Headers{{"X-Forwarded-For", "198.51.100.23, 203.0.113.66"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  EXPECT_EQ(observed_xff, "198.51.100.23, 203.0.113.66");
  EXPECT_EQ(observed_remote_addr, "198.51.100.23");
}

TEST(ForwardedHeadersTest, MultipleTrustedProxies_UsesClientIP) {
  Server svr;

  svr.set_trusted_proxies({"203.0.113.66", "192.0.2.45", "::1", "127.0.0.1"});

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get(
      "/ip",
      Headers{{"X-Forwarded-For", "198.51.100.23, 203.0.113.66, 192.0.2.45"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(observed_xff, "198.51.100.23, 203.0.113.66, 192.0.2.45");
  EXPECT_EQ(observed_remote_addr, "198.51.100.23");
}

TEST(ForwardedHeadersTest, TrustedProxyNotInHeader_UsesRightmostIP) {
  Server svr;

  svr.set_trusted_proxies({"192.0.2.45", "::1", "127.0.0.1"});

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get(
      "/ip", Headers{{"X-Forwarded-For", "198.51.100.23, 198.51.100.24"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  // No listed hop is a trusted proxy, so the rightmost entry (the one written
  // by the closest hop) is used. The leftmost entry is fully client-controlled
  // and must not be selected.
  EXPECT_EQ(observed_xff, "198.51.100.23, 198.51.100.24");
  EXPECT_EQ(observed_remote_addr, "198.51.100.24");
}

TEST(ForwardedHeadersTest, SpoofedIPBeforeTrustedProxyIsIgnored) {
  Server svr;

  svr.set_trusted_proxies({"10.0.0.1", "::1", "127.0.0.1"});

  std::string observed_remote_addr;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // The trusted proxy appends the address it saw (5.6.7.8). The client prepends
  // a forged address and the trusted proxy's own address; the forged value must
  // not win over the address the trusted proxy actually recorded.
  Client cli(HOST, PORT);
  auto res = cli.Get(
      "/ip", Headers{{"X-Forwarded-For", "1.2.3.4, 10.0.0.1, 5.6.7.8"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(observed_remote_addr, "5.6.7.8");
}

TEST(ForwardedHeadersTest, LastHopTrusted_SelectsImmediateLeftIP) {
  Server svr;

  svr.set_trusted_proxies({"192.0.2.45", "::1", "127.0.0.1"});

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);
  auto res = cli.Get(
      "/ip",
      Headers{{"X-Forwarded-For", "198.51.100.23, 203.0.113.66, 192.0.2.45"}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  EXPECT_EQ(observed_xff, "198.51.100.23, 203.0.113.66, 192.0.2.45");
  EXPECT_EQ(observed_remote_addr, "203.0.113.66");
}

TEST(ForwardedHeadersTest, HandlesWhitespaceAroundIPs) {
  Server svr;

  svr.set_trusted_proxies({"192.0.2.45", "::1", "127.0.0.1"});

  std::string observed_remote_addr;
  std::string observed_xff;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff = req.get_header_value("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  std::string raw_req =
      "GET /ip HTTP/1.1\r\n"
      "Host: localhost\r\n"
      "X-Forwarded-For:  198.51.100.23 , 203.0.113.66 , 192.0.2.45 \r\n"
      "Connection: close\r\n"
      "\r\n";

  std::string out;
  ASSERT_TRUE(send_request(5, raw_req, &out));
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));

  // Header parser trims surrounding whitespace of the header value
  EXPECT_EQ(observed_xff, "198.51.100.23 , 203.0.113.66 , 192.0.2.45");
  EXPECT_EQ(observed_remote_addr, "203.0.113.66");
}

// RFC 9110 Section 5.2 and 5.3: repeated field lines carry the same meaning as
// one comma-joined value, in the order received. Proxies such as HAProxy append
// their own X-Forwarded-For as a separate field line rather than extending the
// one the client sent, so every occurrence has to be taken into account.
// Reading only the first one hands back the address the client chose.
TEST(ForwardedHeadersTest, DuplicateFieldLines_JoinsAllOccurrences) {
  Server svr;

  svr.set_trusted_proxies({"192.0.2.45", "::1", "127.0.0.1"});

  std::string observed_remote_addr;
  size_t observed_xff_count = 0;

  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    observed_xff_count = req.get_header_value_count("X-Forwarded-For");
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // The client supplies the first field line; the trusted proxy appends the
  // address it observed as a second one.
  std::string raw_req = "GET /ip HTTP/1.1\r\n"
                        "Host: localhost\r\n"
                        "X-Forwarded-For: 1.2.3.4\r\n"
                        "X-Forwarded-For: 198.51.100.23, 192.0.2.45\r\n"
                        "Connection: close\r\n"
                        "\r\n";

  std::string out;
  ASSERT_TRUE(send_request(5, raw_req, &out, port));
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));

  EXPECT_EQ(observed_xff_count, 2U);
  EXPECT_EQ(observed_remote_addr, "198.51.100.23");

  // The same chain spread over one field line per hop derives the same client
  // address, i.e. the split and the comma-joined representations agree.
  std::string per_hop_req = "GET /ip HTTP/1.1\r\n"
                            "Host: localhost\r\n"
                            "X-Forwarded-For: 1.2.3.4\r\n"
                            "X-Forwarded-For: 198.51.100.23\r\n"
                            "X-Forwarded-For: 192.0.2.45\r\n"
                            "Connection: close\r\n"
                            "\r\n";

  out.clear();
  ASSERT_TRUE(send_request(5, per_hop_req, &out, port));
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));

  EXPECT_EQ(observed_xff_count, 3U);
  EXPECT_EQ(observed_remote_addr, "198.51.100.23");
}

// An X-Forwarded-For header whose value parses to zero IP segments must not
// crash the server (it used to call front() on an empty vector inside
// get_client_ip). The connection-level remote address must be retained instead.
static void run_malformed_xff_test(const std::string &xff_value) {
  Server svr;
  svr.set_trusted_proxies({"192.0.2.45"});

  std::string observed_remote_addr;
  svr.Get("/ip", [&](const Request &req, Response &res) {
    observed_remote_addr = req.remote_addr;
    res.set_content("ok", "text/plain");
  });

  int port = 0;
  thread t = thread([&]() {
    port = svr.bind_to_any_port(HOST);
    svr.listen_after_bind();
  });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get("/ip", Headers{{"X-Forwarded-For", xff_value}});

  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_TRUE(observed_remote_addr == "::1" ||
              observed_remote_addr == "127.0.0.1");
}

TEST(ForwardedHeadersTest, EmptyXForwardedFor_DoesNotCrash) {
  run_malformed_xff_test("");
}

TEST(ForwardedHeadersTest, CommaOnlyXForwardedFor_DoesNotCrash) {
  run_malformed_xff_test(",");
}

TEST(ForwardedHeadersTest, MultipleCommasXForwardedFor_DoesNotCrash) {
  run_malformed_xff_test(", , ,");
}

// The same rule applies to Accept: a request whose acceptable types are spread
// over several field lines must be negotiated against all of them.
// RFC 9110 Section 7.6.1: Connection carries a comma-separated list of
// case-insensitive connection options. Comparing the whole field value against
// one option misses a client that sends several of them, and misses every
// casing but the one written in the comparison.
//
// Sends req, reads the response, then reuses the same socket for a second
// request to find out whether the server kept the connection.
static void probe_connection_reuse(int port, const std::string &req,
                                   bool *announced_close, bool *reusable) {
  auto error = Error::Success;
  auto sock = detail::create_client_socket(
      HOST, "", port, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/5, 0,
      /*read_timeout_sec=*/1, 0,
      /*write_timeout_sec=*/5, 0, std::string(), error);
  ASSERT_NE(sock, INVALID_SOCKET);
  auto se = detail::scope_exit([&] { detail::close_socket(sock); });

  const std::string second = "GET /keepalive HTTP/1.1\r\n"
                             "Host: localhost\r\n"
                             "Connection: close\r\n"
                             "\r\n";
  std::string first_response;
  std::string second_response;

  detail::process_client_socket(
      sock, 1, 0, 5, 0, 0, std::chrono::steady_clock::time_point::min(),
      [&](Stream &strm) {
        if (strm.write(req.data(), req.size()) !=
            static_cast<ssize_t>(req.size())) {
          return false;
        }

        char buf[512];
        detail::stream_line_reader reader(strm, buf, sizeof(buf));
        // Headers plus the two-byte body of the handler below
        while (reader.getline()) {
          first_response += reader.ptr();
          if (first_response.find("ok") != std::string::npos) { break; }
        }

        if (strm.write(second.data(), second.size()) !=
            static_cast<ssize_t>(second.size())) {
          return true;
        }
        detail::stream_line_reader reader2(strm, buf, sizeof(buf));
        while (reader2.getline()) {
          second_response += reader2.ptr();
          if (second_response.find("ok") != std::string::npos) { break; }
        }
        return true;
      });

  *announced_close =
      first_response.find("Connection: close") != std::string::npos;
  *reusable = second_response.find("HTTP/1.1 200") != std::string::npos;
}

class ConnectionTokenTest : public ::testing::Test {
protected:
  void SetUp() override {
    svr_.Get("/keepalive", [](const Request &, Response &res) {
      res.set_content("ok", "text/plain");
    });
    port_ = svr_.bind_to_any_port(HOST);
    thread_ = thread([&]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }

  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) { thread_.join(); }
  }

  Server svr_;
  int port_ = 0;
  thread thread_;
};

// "close" alongside another option still closes the connection, and the
// response says so rather than leaving the peer to discover it.
TEST_F(ConnectionTokenTest, CloseAmongSeveralOptionsIsHonored) {
  bool announced_close = false;
  bool reusable = true;
  probe_connection_reuse(port_,
                         "GET /keepalive HTTP/1.1\r\n"
                         "Host: localhost\r\n"
                         "Connection: keep-alive, close\r\n"
                         "\r\n",
                         &announced_close, &reusable);
  EXPECT_TRUE(announced_close);
  EXPECT_FALSE(reusable);
}

// "close" split over two field lines is the same list, so it is honored too.
TEST_F(ConnectionTokenTest, CloseOnALaterFieldLineIsHonored) {
  bool announced_close = false;
  bool reusable = true;
  probe_connection_reuse(port_,
                         "GET /keepalive HTTP/1.1\r\n"
                         "Host: localhost\r\n"
                         "Connection: keep-alive\r\n"
                         "Connection: close\r\n"
                         "\r\n",
                         &announced_close, &reusable);
  EXPECT_TRUE(announced_close);
  EXPECT_FALSE(reusable);
}

// Connection options are case-insensitive, so an HTTP/1.0 client asking for
// keep-alive in the spelling everyone actually sends keeps its connection.
TEST_F(ConnectionTokenTest, Http10KeepAliveIsCaseInsensitive) {
  bool announced_close = false;
  bool reusable = false;
  probe_connection_reuse(port_,
                         "GET /keepalive HTTP/1.0\r\n"
                         "Host: localhost\r\n"
                         "Connection: keep-alive\r\n"
                         "\r\n",
                         &announced_close, &reusable);
  EXPECT_FALSE(announced_close);
  EXPECT_TRUE(reusable);
}

// A token the value merely contains is not the token itself.
TEST_F(ConnectionTokenTest, SubstringOfAnOptionIsNotTheOption) {
  bool announced_close = false;
  bool reusable = false;
  probe_connection_reuse(port_,
                         "GET /keepalive HTTP/1.1\r\n"
                         "Host: localhost\r\n"
                         "Connection: notclose\r\n"
                         "\r\n",
                         &announced_close, &reusable);
  EXPECT_FALSE(announced_close);
  EXPECT_TRUE(reusable);
}

TEST(RepeatedFieldLinesTest, AcceptCombinesEveryFieldLine) {
  Server svr;

  std::vector<std::string> observed_types;

  svr.Get("/", [&](const Request &req, Response &res) {
    observed_types = req.accept_content_types;
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  Headers headers;
  headers.emplace("Accept", "text/plain;q=0.5");
  headers.emplace("Accept", "application/json");

  auto res = cli.Get("/", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);

  // Sorted by q-value, so the second field line's type comes first
  ASSERT_EQ(2U, observed_types.size());
  EXPECT_EQ("application/json", observed_types[0]);
  EXPECT_EQ("text/plain", observed_types[1]);
}

// RFC 9110 Section 5.6.1.2: empty list elements are parsed and ignored, so an
// empty field line must not contribute a bare comma to the combined value.
TEST(RepeatedFieldLinesTest, EmptyFieldLineDoesNotInjectComma) {
  Server svr;

  std::vector<std::string> observed_types;

  svr.Get("/", [&](const Request &req, Response &res) {
    observed_types = req.accept_content_types;
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  // Empty first field line, then a real one
  std::string raw_req = "GET / HTTP/1.1\r\n"
                        "Host: localhost\r\n"
                        "Accept:\r\n"
                        "Accept: application/json\r\n"
                        "Connection: close\r\n"
                        "\r\n";

  std::string out;
  ASSERT_TRUE(send_request(5, raw_req, &out, port));
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));

  ASSERT_EQ(1U, observed_types.size());
  EXPECT_EQ("application/json", observed_types[0]);
}

// The skip in get_combined_header_value() is what keeps an empty field line
// from contributing a bare comma. Only a trailing empty field line exercises
// it: a leading one is already covered by the "combined is still empty" check,
// and parse_accept_header() now ignores the empty element either way, so the
// request-level test above can no longer tell the two apart.
TEST(RepeatedFieldLinesTest, EmptyFieldLineIsNotCombined) {
  Headers headers;
  headers.emplace("Accept", "text/html");
  headers.emplace("Accept", "");
  EXPECT_EQ("text/html", detail::get_combined_header_value(headers, "Accept"));

  headers.clear();
  headers.emplace("Accept", "");
  headers.emplace("Accept", "application/json");
  EXPECT_EQ("application/json",
            detail::get_combined_header_value(headers, "Accept"));
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
// An encoding offered on a later Accept-Encoding field line is still offered.
TEST(RepeatedFieldLinesTest, AcceptEncodingCombinesEveryFieldLine) {
  Server svr;

  svr.Get("/", [](const Request & /*req*/, Response &res) {
    res.set_content(std::string(1024, 'x'), "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_decompress(false);

  Headers headers;
  headers.emplace("Accept-Encoding", "identity");
  headers.emplace("Accept-Encoding", "gzip");

  auto res = cli.Get("/", headers);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("gzip", res->get_header_value("Content-Encoding"));
}
#endif

// RFC 9112 6.3: whatever follows a request with neither Content-Length nor
// Transfer-Encoding is not its body.
TEST(ServerRequestParsingTest, BytesAfterUnframedRequestAreNotItsBody) {
  Server svr;
  svr.set_payload_max_length(8);
  svr.Post("/test", [](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  std::string resp;
  ASSERT_TRUE(send_request(1,
                           "POST /test HTTP/1.1\r\n"
                           "Host: localhost\r\n"
                           "Connection: close\r\n"
                           "\r\n" +
                               std::string(16, 'X'),
                           &resp, port));
  EXPECT_EQ("HTTP/1.1 200 OK", resp.substr(0, resp.find("\r\n")));
}

TEST(ServerRequestParsingTest, RequestWithoutContentLengthOrTransferEncoding) {
  Server svr;

  svr.Post("/post", [&](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  svr.Put("/put", [&](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  svr.Patch("/patch", [&](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  svr.Delete("/delete", [&](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  thread t = thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  std::string resp;

  // POST without Content-Length
  ASSERT_TRUE(send_request(5,
                           "POST /post HTTP/1.1\r\n"
                           "Host: localhost\r\n"
                           "Connection: close\r\n"
                           "\r\n",
                           &resp));
  EXPECT_TRUE(resp.find("HTTP/1.1 200 OK") == 0);

  // PUT without Content-Length
  resp.clear();
  ASSERT_TRUE(send_request(5,
                           "PUT /put HTTP/1.1\r\n"
                           "Host: localhost\r\n"
                           "Connection: close\r\n"
                           "\r\n",
                           &resp));
  EXPECT_TRUE(resp.find("HTTP/1.1 200 OK") == 0);

  // PATCH without Content-Length
  resp.clear();
  ASSERT_TRUE(send_request(5,
                           "PATCH /patch HTTP/1.1\r\n"
                           "Host: localhost\r\n"
                           "Connection: close\r\n"
                           "\r\n",
                           &resp));
  EXPECT_TRUE(resp.find("HTTP/1.1 200 OK") == 0);

  // DELETE without Content-Length
  resp.clear();
  ASSERT_TRUE(send_request(5,
                           "DELETE /delete HTTP/1.1\r\n"
                           "Host: localhost\r\n"
                           "Connection: close\r\n"
                           "\r\n",
                           &resp));
  EXPECT_TRUE(resp.find("HTTP/1.1 200 OK") == 0);
}

//==============================================================================
// open_stream() Tests
//==============================================================================

inline std::string read_all(ClientImpl::StreamHandle &handle) {
  std::string result;
  char buf[8192];
  ssize_t n;
  while ((n = handle.read(buf, sizeof(buf))) > 0) {
    result.append(buf, static_cast<size_t>(n));
  }
  return result;
}

// Mock stream for unit tests
class MockStream : public Stream {
public:
  std::string data;
  size_t pos = 0;
  ssize_t error_after = -1; // -1 = no error

  explicit MockStream(const std::string &d, ssize_t err = -1)
      : data(d), error_after(err) {}
  bool is_readable() const override { return true; }
  bool wait_readable() const override { return true; }
  bool wait_writable() const override { return true; }
  ssize_t read(char *ptr, size_t size) override {
    if (error_after >= 0 && pos >= static_cast<size_t>(error_after)) return -1;
    if (pos >= data.size()) return 0;
    size_t limit =
        error_after >= 0 ? static_cast<size_t>(error_after) : data.size();
    size_t to_read = std::min(size, std::min(data.size() - pos, limit - pos));
    std::memcpy(ptr, data.data() + pos, to_read);
    pos += to_read;
    return static_cast<ssize_t>(to_read);
  }
  ssize_t write(const char *, size_t) override { return -1; }
  void get_remote_ip_and_port(std::string &ip, int &port) const override {
    ip = "127.0.0.1";
    port = 0;
  }
  void get_local_ip_and_port(std::string &ip, int &port) const override {
    ip = "127.0.0.1";
    port = 0;
  }
  socket_t socket() const override { return INVALID_SOCKET; }
  time_t duration() const override { return 0; }
};

TEST(StreamHandleTest, Basic) {
  ClientImpl::StreamHandle handle;
  EXPECT_FALSE(handle.is_valid());
  handle.response = detail::make_unique<Response>();
  handle.error = Error::Connection;
  EXPECT_FALSE(handle.is_valid());
  handle.error = Error::Success;
  EXPECT_TRUE(handle.is_valid());
}

TEST(BodyReaderTest, Basic) {
  MockStream stream("Hello, World!");
  detail::BodyReader reader;
  reader.stream = &stream;
  reader.content_length = 13;
  char buf[32];
  EXPECT_EQ(13, reader.read(buf, sizeof(buf)));
  EXPECT_EQ(0, reader.read(buf, sizeof(buf)));
  EXPECT_TRUE(reader.eof);
}

TEST(BodyReaderTest, NoStream) {
  detail::BodyReader reader;
  char buf[32];
  EXPECT_EQ(-1, reader.read(buf, sizeof(buf)));
  EXPECT_EQ(Error::Connection, reader.last_error);
}

TEST(BodyReaderTest, Error) {
  MockStream stream("Hello, World!", 5);
  detail::BodyReader reader;
  reader.stream = &stream;
  reader.content_length = 13;
  char buf[32];
  EXPECT_EQ(5, reader.read(buf, sizeof(buf)));
  EXPECT_EQ(-1, reader.read(buf, sizeof(buf)));
  EXPECT_EQ(Error::Read, reader.last_error);
}

// Memory buffer mode removed: StreamHandle reads only from socket streams.
// Mock-based StreamHandle tests relying on private internals are removed.

class OpenStreamTest : public ::testing::Test {
protected:
  void SetUp() override {
    svr_.Get("/hello", [](const Request &, Response &res) {
      res.set_content("Hello World!", "text/plain");
    });
    svr_.Get("/large", [](const Request &, Response &res) {
      res.set_content(std::string(10000, 'X'), "text/plain");
    });
    svr_.Get("/unknown-encoding", [](const Request &, Response &res) {
      res.set_content("Hello World!", "image/jpeg");
      res.set_header("Content-Encoding", "UTF-8");
    });
    svr_.Get("/chunked", [](const Request &, Response &res) {
      res.set_chunked_content_provider("text/plain",
                                       [](size_t offset, DataSink &sink) {
                                         if (offset < 15) {
                                           sink.write("chunk", 5);
                                           return true;
                                         }
                                         sink.done();
                                         return true;
                                       });
    });
    svr_.Get("/compressible", [](const Request &, Response &res) {
      res.set_chunked_content_provider("text/plain", [](size_t offset,
                                                        DataSink &sink) {
        if (offset < 100 * 1024) {
          std::string chunk(std::min(size_t(8192), 100 * 1024 - offset), 'A');
          sink.write(chunk.data(), chunk.size());
          return true;
        }
        sink.done();
        return true;
      });
    });
    svr_.Get("/streamed-chunked-with-prohibited-trailer",
             [](const Request & /*req*/, Response &res) {
               auto i = new int(0);
               res.set_header("Trailer", "Content-Length, X-Allowed");
               res.set_chunked_content_provider(
                   "text/plain",
                   [i](size_t /*offset*/, DataSink &sink) {
                     switch (*i) {
                     case 0: sink.os << "123"; break;
                     case 1: sink.os << "456"; break;
                     case 2: sink.os << "789"; break;
                     case 3: {
                       sink.done_with_trailer(
                           {{"Content-Length", "5"}, {"X-Allowed", "yes"}});
                     } break;
                     }
                     (*i)++;
                     return true;
                   },
                   [i](bool success) {
                     EXPECT_TRUE(success);
                     delete i;
                   });
             });
    // Echo headers endpoint for header-related tests
    svr_.Get("/echo-headers", [](const Request &req, Response &res) {
      std::string body;
      for (const auto &h : req.headers) {
        body.append(h.first);
        body.push_back(':');
        body.append(h.second);
        body.push_back('\n');
      }
      res.set_content(body, "text/plain");
    });
    svr_.Post("/echo-headers", [](const Request &req, Response &res) {
      std::string body;
      for (const auto &h : req.headers) {
        body.append(h.first);
        body.push_back(':');
        body.append(h.second);
        body.push_back('\n');
      }
      res.set_content(body, "text/plain");
    });
    port_ = svr_.bind_to_any_port("127.0.0.1");
    thread_ = std::thread([this]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }
  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) thread_.join();
  }
  Server svr_;
  std::thread thread_;
  int port_ = 0;
};

TEST_F(OpenStreamTest, Basic) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/hello");
  EXPECT_TRUE(handle.is_valid());
  EXPECT_EQ("Hello World!", read_all(handle));
}

TEST_F(OpenStreamTest, UnknownContentEncodingIsPassedThrough) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/unknown-encoding");
  ASSERT_TRUE(handle.is_valid());
  EXPECT_EQ("Hello World!", read_all(handle));
}

TEST_F(OpenStreamTest, SmallBuffer) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/hello");
  std::string result;
  char buf[4];
  ssize_t n;
  while ((n = handle.read(buf, sizeof(buf))) > 0)
    result.append(buf, static_cast<size_t>(n));
  EXPECT_EQ("Hello World!", result);
}

TEST_F(OpenStreamTest, DefaultHeaders) {
  Client cli("127.0.0.1", port_);

  // open_stream GET should include Host, User-Agent and Accept-Encoding
  {
    auto handle = cli.open_stream("GET", "/echo-headers");
    ASSERT_TRUE(handle.is_valid());
    auto body = read_all(handle);
    EXPECT_NE(body.find("Host:127.0.0.1:" + std::to_string(port_)),
              std::string::npos);
    EXPECT_NE(body.find("User-Agent:cpp-httplib/" CPPHTTPLIB_VERSION),
              std::string::npos);
    EXPECT_NE(body.find("Accept-Encoding:"), std::string::npos);
  }

  // open_stream POST with body and no explicit content_type should NOT add
  // text/plain Content-Type (behavior differs from non-streaming path), but
  // should include Content-Length
  {
    auto handle = cli.open_stream("POST", "/echo-headers", {}, {}, "hello", "");
    ASSERT_TRUE(handle.is_valid());
    auto body = read_all(handle);
    EXPECT_EQ(body.find("Content-Type: text/plain"), std::string::npos);
    EXPECT_NE(body.find("Content-Length:5"), std::string::npos);
  }

  // open_stream POST with explicit Content-Type should preserve it
  {
    auto handle = cli.open_stream("POST", "/echo-headers", {},
                                  {{"Content-Type", "application/custom"}},
                                  "{}", "application/custom");
    ASSERT_TRUE(handle.is_valid());
    auto body = read_all(handle);
    EXPECT_NE(body.find("Content-Type:application/custom"), std::string::npos);
  }

  // User-specified User-Agent must not be overwritten for stream API
  {
    auto handle = cli.open_stream("GET", "/echo-headers", {},
                                  {{"User-Agent", "MyAgent/1.2"}});
    ASSERT_TRUE(handle.is_valid());
    auto body = read_all(handle);
    EXPECT_NE(body.find("User-Agent:MyAgent/1.2"), std::string::npos);
  }
}

TEST_F(OpenStreamTest, Large) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/large");
  EXPECT_EQ(10000u, read_all(handle).size());
}

TEST_F(OpenStreamTest, ConnectionError) {
  Client cli("127.0.0.1", 9999);
  auto handle = cli.open_stream("GET", "/hello");
  EXPECT_FALSE(handle.is_valid());
}

TEST_F(OpenStreamTest, Chunked) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/chunked");
  EXPECT_TRUE(handle.response && handle.response->get_header_value(
                                     "Transfer-Encoding") == "chunked");
  EXPECT_EQ("chunkchunkchunk", read_all(handle));
}

TEST_F(OpenStreamTest, ProhibitedTrailersAreIgnored_Stream) {
  Client cli("127.0.0.1", port_);
  auto handle =
      cli.open_stream("GET", "/streamed-chunked-with-prohibited-trailer");
  ASSERT_TRUE(handle.is_valid());

  // Consume body to allow trailers to be received/parsed
  auto body = read_all(handle);

  // Explicitly parse trailers (ensure trailers are available for assertion)
  handle.parse_trailers_if_needed();
  EXPECT_EQ(std::string("123456789"), body);

  // The response should include a Trailer header declaring both names
  ASSERT_TRUE(handle.response);
  EXPECT_TRUE(handle.response->has_header("Trailer"));
  EXPECT_EQ(std::string("Content-Length, X-Allowed"),
            handle.response->get_header_value("Trailer"));

  // Prohibited trailer must not be present
  EXPECT_FALSE(handle.response->has_trailer("Content-Length"));
  // Allowed trailer should be present
  EXPECT_TRUE(handle.response->has_trailer("X-Allowed"));
  EXPECT_EQ(std::string("yes"),
            handle.response->get_trailer_value("X-Allowed"));

  // Verify trailers are NOT present as regular headers
  EXPECT_EQ(std::string(""),
            handle.response->get_header_value("Content-Length"));
  EXPECT_EQ(std::string(""), handle.response->get_header_value("X-Allowed"));
}

// Accepts one connection on an OS-assigned port, which it hands over through
// port_promise, reads the request head and sends back response. after_send,
// if given, runs on the connection before it is closed.
static std::thread
serve_single_response(std::promise<int> &port_promise,
                      const std::string &response,
                      std::function<void(socket_t)> after_send = nullptr) {
  return std::thread([&port_promise, response, after_send] {
    auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
    default_socket_options(srv);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(srv, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(0); // Let OS assign a free port
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);

    int opt = 1;
    ::setsockopt(srv, SOL_SOCKET, SO_REUSEADDR,
#ifdef _WIN32
                 reinterpret_cast<const char *>(&opt),
#else
                 &opt,
#endif
                 sizeof(opt));

    if (::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)) != 0 ||
        ::listen(srv, 1) != 0) {
      port_promise.set_value(-1);
      detail::close_socket(srv);
      return;
    }

    socklen_t addr_len = sizeof(addr);
    ::getsockname(srv, reinterpret_cast<sockaddr *>(&addr), &addr_len);
    port_promise.set_value(static_cast<int>(ntohs(addr.sin_port)));

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);

    if (cli != INVALID_SOCKET) {
      // Read the complete HTTP request (until the blank line that terminates
      // headers) before sending the response.  If the server closes the socket
      // while the client's request data is still unread in the kernel receive
      // buffer, the TCP stack sends RST instead of FIN.  That RST resets the
      // connection on both sides: it discards the client's receive buffer
      // (which already holds our response) and causes any in-progress write on
      // the client to fail with ECONNRESET.  Reading all request data first
      // ensures close() emits a graceful FIN.
      {
        char rbuf[256];
        std::string req;
        while (req.find("\r\n\r\n") == std::string::npos) {
          auto n = ::recv(cli, rbuf, sizeof(rbuf), 0);
          if (n <= 0) { break; }
          req.append(rbuf, static_cast<size_t>(n));
        }
      }

      ::send(cli,
#ifdef _WIN32
             static_cast<const char *>(response.c_str()),
             static_cast<int>(response.size()),
#else
             response.c_str(), response.size(),
#endif
             0);

      if (after_send) { after_send(cli); }
      detail::close_socket(cli);
    }
    detail::close_socket(srv);
  });
}

TEST(OpenStreamMalformedContentLength, InvalidArgument) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  std::promise<int> port_promise;
  auto port_future = port_promise.get_future();
  auto server_thread =
      serve_single_response(port_promise, "HTTP/1.1 200 OK\r\n"
                                          "Content-Type: text/plain\r\n"
                                          "Content-Length: not-a-number\r\n"
                                          "Connection: close\r\n"
                                          "\r\n"
                                          "hello");

  auto port = port_future.get();
  ASSERT_GT(port, 0);
  Client cli("127.0.0.1", port);
  auto handle = cli.open_stream("GET", "/");
  EXPECT_FALSE(handle.is_valid());

  server_thread.join();
}

TEST(OpenStreamMalformedContentLength, OutOfRange) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  std::promise<int> port_promise;
  auto port_future = port_promise.get_future();
  auto server_thread = serve_single_response(
      port_promise, "HTTP/1.1 200 OK\r\n"
                    "Content-Type: text/plain\r\n"
                    "Content-Length: 99999999999999999999999999\r\n"
                    "Connection: close\r\n"
                    "\r\n"
                    "hello");

  auto port = port_future.get();
  ASSERT_GT(port, 0);

  // Historically std::stoull would throw std::out_of_range here and crash
  // the process, then parsing silently clamped to a bogus framing length and
  // the stream opened anyway. Now the out-of-range value is flagged invalid,
  // so the stream fails to open, matching the not-a-number case above. The
  // process still must NOT terminate.
  Client cli("127.0.0.1", port);
  auto handle = cli.open_stream("GET", "/");
  EXPECT_FALSE(handle.is_valid());

  server_thread.join();
}

#ifndef _WIN32
// As above for the body of a streamed request: a send() cut short by the write
// timeout must not leave the rest of the body unsent.
TEST(OpenStreamPartialWriteTest, BodyIsWrittenWhole) {
  signal(SIGPIPE, SIG_IGN);

  Server svr;
  svr.set_socket_options([](socket_t sock) {
    int size = 8192;
    setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
               reinterpret_cast<const char *>(&size), sizeof(size));
  });
  svr.Post("/size", [](const Request &, Response &res,
                       const ContentReader &content_reader) {
    // Outlast the client's write timeout before reading the body.
    std::this_thread::sleep_for(std::chrono::milliseconds(750));
    size_t received = 0;
    content_reader([&](const char *, size_t len) {
      received += len;
      return true;
    });
    res.set_content(std::to_string(received), "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_write_timeout(0, 500000);
  cli.set_socket_options([](socket_t sock) {
    int size = 8192;
    setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
               reinterpret_cast<const char *>(&size), sizeof(size));
  });

  const std::string body(4 * 1024 * 1024, 'A');
  auto handle = cli.open_stream("POST", "/size", {}, {}, body,
                                "application/octet-stream");
  ASSERT_TRUE(handle.is_valid()) << to_string(handle.error);
  EXPECT_EQ(StatusCode::OK_200, handle.response->status);
  EXPECT_EQ(std::to_string(body.size()), read_all(handle));
}
#endif

// Serves `response` to the single request `fn` makes with a fresh client.
template <typename Fn>
static void with_single_response(const std::string &response, Fn fn) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  std::promise<int> port_promise;
  auto port_future = port_promise.get_future();
  auto server_thread = serve_single_response(port_promise, response);
  auto se = detail::scope_exit([&] { server_thread.join(); });

  auto port = port_future.get();
  ASSERT_GT(port, 0);
  Client cli("127.0.0.1", port);
  fn(cli);
}

// set_decompress(false) hands out the encoded bytes through the streaming APIs
// too, also in a build without the decoder for the advertised coding.
TEST(StreamDecompressionTest, DisabledPreservesEncodedBody) {
  const std::string gzipped(GZIPPED_HELLO_WORLD, sizeof(GZIPPED_HELLO_WORLD));
  const auto response = "HTTP/1.1 200 OK\r\n"
                        "Content-Encoding: gzip\r\n"
                        "Content-Length: " +
                        std::to_string(gzipped.size()) +
                        "\r\n"
                        "Connection: close\r\n\r\n" +
                        gzipped;

  with_single_response(response, [&](Client &cli) {
    cli.set_decompress(false);
    auto handle = cli.open_stream("GET", "/");
    ASSERT_TRUE(handle.is_valid()) << to_string(handle.error);
    EXPECT_EQ("gzip", handle.response->get_header_value("Content-Encoding"));
    EXPECT_EQ(gzipped, read_all(handle));
    EXPECT_FALSE(handle.has_read_error());
  });

  with_single_response(response, [&](Client &cli) {
    cli.set_decompress(false);
    auto res = stream::Get(cli, "/", 7);
    ASSERT_TRUE(res) << to_string(res.error());
    EXPECT_EQ("gzip", res.get_header_value("Content-Encoding"));
    EXPECT_EQ(gzipped, res.read_all());
    EXPECT_FALSE(res.has_read_error());
  });
}

TEST(StreamBodyEndTest, BodyEndingAtConnectionClose) {
  // Neither Content-Length nor chunked: the body ends at the close
  const char *close_delimited = "HTTP/1.1 200 OK\r\n"
                                "Connection: close\r\n"
                                "\r\n"
                                "hello";
  with_single_response(close_delimited, [](Client &cli) {
    auto handle = cli.open_stream("GET", "/");
    ASSERT_TRUE(handle.is_valid());
    EXPECT_EQ("hello", read_all(handle));
    EXPECT_FALSE(handle.has_read_error());
  });

  // A close before the end of the Content-Length is still an error
  const char *short_content_length = "HTTP/1.1 200 OK\r\n"
                                     "Content-Length: 10\r\n"
                                     "\r\n"
                                     "hello";
  with_single_response(short_content_length, [](Client &cli) {
    auto handle = cli.open_stream("GET", "/");
    ASSERT_TRUE(handle.is_valid());
    read_all(handle);
    EXPECT_EQ(Error::ConnectionClosed, handle.get_read_error());
  });

  // So is a close before the last chunk
  const char *short_chunked = "HTTP/1.1 200 OK\r\n"
                              "Transfer-Encoding: chunked\r\n"
                              "\r\n"
                              "5\r\nhello\r\n";
  with_single_response(short_chunked, [](Client &cli) {
    auto handle = cli.open_stream("GET", "/");
    ASSERT_TRUE(handle.is_valid());
    read_all(handle);
    EXPECT_TRUE(handle.has_read_error());
  });
}

TEST(InterimResponseTest, SkippedWithTheirHeaderFields) {
  const char *responses[] = {
      "HTTP/1.1 103 Early Hints\r\n"
      "Link: </style.css>; rel=preload\r\n"
      "\r\n"
      "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nok",
      "HTTP/1.1 100 Continue\r\n"
      "X-Note: interim\r\n"
      "\r\n"
      "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nok",
  };

  for (auto response : responses) {
    with_single_response(response, [](Client &cli) {
      auto res = cli.Get("/");
      ASSERT_TRUE(res) << "Error: " << to_string(res.error());
      EXPECT_EQ(StatusCode::OK_200, res->status);
      EXPECT_EQ("ok", res->body);
    });
  }
}

TEST(InterimResponseTest, OnlySoManyAreSkipped) {
  const std::string interim = "HTTP/1.1 102 Processing\r\n\r\n";
  const std::string final_response =
      "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nok";
  std::string interims;
  for (auto i = 0; i < CPPHTTPLIB_INTERIM_RESPONSE_MAX_COUNT; i++) {
    interims += interim;
  }

  with_single_response(interims + final_response, [](Client &cli) {
    auto res = cli.Get("/");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ("ok", res->body);
  });

  with_single_response(interims + interim + final_response, [](Client &cli) {
    auto res = cli.Get("/");
    ASSERT_FALSE(res);
    EXPECT_EQ(Error::Read, res.error());
  });
}

TEST(ExpectContinueTest, EarlyFinalResponseClosesConnection) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif
  // The server answers the head without asking for the body. Bytes it then
  // reads on the connection would be taken for the body the request declared.
  auto closed_by_client = false;
  std::promise<int> port_promise;
  auto server_thread = serve_single_response(
      port_promise, "HTTP/1.1 401 Unauthorized\r\nContent-Length: 0\r\n\r\n",
      [&](socket_t sock) {
        detail::set_socket_opt_time(sock, SOL_SOCKET, SO_RCVTIMEO, 3, 0);
        char buf[256];
        closed_by_client = ::recv(sock, buf, sizeof(buf), 0) == 0;
      });

  Client cli("127.0.0.1", port_promise.get_future().get());
  cli.set_keep_alive(true);
  cli.set_read_timeout(1, 0);
  // Long enough for the client to send Expect: 100-continue.
  auto res = cli.Post("/upload", std::string(2048, 'B'), "text/plain");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
  cli.Get("/second");

  server_thread.join();
  EXPECT_TRUE(closed_by_client);
}

TEST(InterimResponseTest, SkippedWhileWaitingForContinue) {
  // Long enough for the client to send Expect: 100-continue
  with_single_response(
      "HTTP/1.1 103 Early Hints\r\n"
      "Link: </style.css>; rel=preload\r\n"
      "\r\n"
      "HTTP/1.1 401 Unauthorized\r\n"
      "Content-Length: 0\r\n\r\n",
      [](Client &cli) {
        cli.set_read_timeout(2, 0);
        auto res = cli.Post("/upload", std::string(2048, 'B'), "text/plain");
        ASSERT_TRUE(res) << "Error: " << to_string(res.error());
        EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
      });
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(ExpectContinueTest, AuthRetryAfterEarlyResponseUsesANewConnection) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif
  auto reused = false;
  std::promise<int> port_promise;
  auto server_thread = serve_single_response(
      port_promise,
      "HTTP/1.1 401 Unauthorized\r\n"
      "WWW-Authenticate: Digest realm=\"r\", nonce=\"n\", qop=\"auth\"\r\n"
      "Content-Length: 0\r\n\r\n",
      [&](socket_t sock) {
        detail::set_socket_opt_time(sock, SOL_SOCKET, SO_RCVTIMEO, 3, 0);
        char buf[256];
        reused = ::recv(sock, buf, sizeof(buf), 0) > 0;
      });

  Client cli("127.0.0.1", port_promise.get_future().get());
  cli.set_keep_alive(true);
  cli.set_digest_auth("user", "pass");
  cli.set_read_timeout(1, 0);
  cli.Post("/upload", std::string(2048, 'B'), "text/plain");

  server_thread.join();
  EXPECT_FALSE(reused);
}

TEST(ProxyConnectTest, OnlyAProxyAuthChallengeIsPassedOn) {
  // Any other answer to CONNECT would read as the origin's response.
  struct {
    const char *response;
    bool passed_on;
  } cases[] = {
      {"HTTP/1.1 201 Created\r\n"
       "Set-Cookie: session=from-proxy\r\n"
       "Content-Length: 0\r\n\r\n",
       false},
      {"HTTP/1.1 403 Forbidden\r\nContent-Length: 0\r\n\r\n", false},
      {"HTTP/1.1 407 Proxy Authentication Required\r\n"
       "Content-Length: 0\r\n\r\n",
       true},
  };

  for (const auto &c : cases) {
    std::promise<int> port_promise;
    auto server_thread = serve_single_response(port_promise, c.response);
    SSLClient cli("example.com", 443);
    cli.set_proxy("127.0.0.1", port_promise.get_future().get());
    auto res = cli.Get("/");
    server_thread.join();

    EXPECT_EQ(Error::ProxyConnection, res.error()) << c.response;
    ASSERT_EQ(c.passed_on, static_cast<bool>(res)) << c.response;
    if (res) {
      EXPECT_EQ(StatusCode::ProxyAuthenticationRequired_407, res->status);
    }
  }
}
#endif

// Records the client's error logger calls as "error METHOD path", or
// "error null" for a call without a request
static ErrorLogger record_errors(std::vector<std::string> &log) {
  return [&log](const Error &err, const Request *req) {
    log.push_back(to_string(err) + " " +
                  (req ? req->method + " " + req->path : "null"));
  };
}

// A failed request is reported once, with the request the caller made
TEST(ClientErrorLoggerTest, CancelIsLoggedOnce) {
  Server svr;
  svr.Get("/big", [](const Request &, Response &res) {
    res.set_content(std::string(100000, 'b'), "text/plain");
  });
  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  std::vector<std::string> log;
  cli.set_error_logger(record_errors(log));
  std::vector<std::string> expected{to_string(Error::Canceled) + " GET /big"};

  cli.Get("/big", [](const char *, size_t) { return false; });
  EXPECT_EQ(expected, log);

  log.clear();
  cli.Get("/big", [](size_t, size_t) { return false; });
  EXPECT_EQ(expected, log);
}

TEST(ClientErrorLoggerTest, RedirectFailureIsLoggedWithTheCallersRequest) {
  // Fails while the body is read
  auto broken = [](const Request &, Response &res) {
    res.set_content_provider(10, "text/plain",
                             [](size_t, size_t, DataSink &) { return false; });
  };
  Server other;
  other.Get("/broken", broken);
  auto other_port = other.bind_to_any_port(HOST);
  std::thread other_t([&]() { other.listen_after_bind(); });
  auto other_se = detail::scope_exit([&] {
    other.stop();
    other_t.join();
  });
  other.wait_until_ready();

  Server svr;
  svr.Get("/broken", broken);
  svr.Get("/same-origin",
          [](const Request &, Response &res) { res.set_redirect("/broken"); });
  svr.Get("/cross-origin", [&](const Request &, Response &res) {
    res.set_redirect("http://" + std::string(HOST) + ":" +
                     std::to_string(other_port) + "/broken");
  });
  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  cli.set_follow_location(true);
  std::vector<std::string> log;
  cli.set_error_logger(record_errors(log));

  for (auto path : {"/same-origin", "/cross-origin"}) {
    log.clear();
    auto res = cli.Get(path);
    ASSERT_FALSE(res);
    EXPECT_EQ(std::vector<std::string>{to_string(res.error()) + " GET " + path},
              log);
  }
}

TEST(ClientErrorLoggerTest, StreamOpenFailureIsLoggedOnce) {
  with_single_response("garbage\r\n\r\n", [](Client &cli) {
    std::vector<std::string> log;
    cli.set_error_logger(record_errors(log));
    auto handle = cli.open_stream("GET", "/x");
    EXPECT_FALSE(handle.is_valid());
    EXPECT_EQ(std::vector<std::string>{to_string(handle.error) + " GET /x"},
              log);
  });
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(ClientErrorLoggerTest, TlsSetupFailureIsLoggedOnce) {
  // Not a TLS server, so the handshake fails. It waits for a request line in
  // the handshake bytes, so a short read timeout lets it close quickly.
  Server svr;
  svr.set_read_timeout(0, 100000);
  svr.Get("/x", [](const Request &, Response &res) {
    res.set_content("x", "text/plain");
  });
  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  std::vector<std::string> log;

  SSLClient cli(HOST, port);
  cli.enable_server_certificate_verification(false);
  cli.set_error_logger(record_errors(log));
  auto res = cli.Get("/x");
  ASSERT_FALSE(res);
  EXPECT_EQ(std::vector<std::string>{to_string(res.error()) + " GET /x"}, log);

  log.clear();
  auto handle = cli.open_stream("GET", "/x");
  EXPECT_FALSE(handle.is_valid());
  EXPECT_EQ(std::vector<std::string>{to_string(handle.error) + " GET /x"}, log);

  log.clear();
  SSLClient no_ca(HOST, port);
  no_ca.set_ca_cert_path("./no-such-ca.pem");
  no_ca.set_error_logger(record_errors(log));
  res = no_ca.Get("/x");
  EXPECT_EQ(Error::SSLLoadingCerts, res.error());
  EXPECT_EQ(std::vector<std::string>{to_string(res.error()) + " GET /x"}, log);
}

TEST(ClientErrorLoggerTest, ProxyConnectFailureIsLoggedOnce) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif
  // Refused, answered with a challenge, or closed without an answer
  for (auto response : {"HTTP/1.1 403 Forbidden\r\nContent-Length: 0\r\n\r\n",
                        "HTTP/1.1 407 Proxy Authentication Required\r\n"
                        "Content-Length: 0\r\n\r\n",
                        ""}) {
    std::promise<int> port_promise;
    auto server_thread = serve_single_response(port_promise, response);
    SSLClient cli("example.com", 443);
    cli.set_proxy("127.0.0.1", port_promise.get_future().get());
    std::vector<std::string> log;
    cli.set_error_logger(record_errors(log));
    auto res = cli.Get("/");
    server_thread.join();

    EXPECT_EQ(std::vector<std::string>{to_string(res.error()) + " GET /"}, log)
        << response;
  }
}
#endif

// RFC 9112 §6.3: a response that pairs a non-zero Content-Length with
// Transfer-Encoding is framed ambiguously. Both read paths delimit its body by
// the chunked coding and drop Content-Length, so a front-end that trusts
// Content-Length would disagree about where the body ends (response
// smuggling). The client must reject such a response.
TEST(ClientResponseSmugglingTest, ContentLengthAndTransferEncodingRejected) {
  for (const char *te : {"chunked", "gzip, chunked"}) {
    auto response = std::string("HTTP/1.1 200 OK\r\n") +
                    "Content-Length: 5\r\n" + "Transfer-Encoding: " + te +
                    "\r\n" + "Connection: close\r\n" + "\r\n" +
                    "5\r\nhello\r\n0\r\n\r\n";

    with_single_response(response, [&](Client &cli) {
      auto res = cli.Get("/");
      EXPECT_FALSE(static_cast<bool>(res)) << te;
      EXPECT_EQ(Error::Read, res.error()) << te;
    });

    with_single_response(response, [&](Client &cli) {
      auto handle = cli.open_stream("GET", "/");
      EXPECT_FALSE(handle.is_valid()) << te;
      EXPECT_EQ(Error::Read, handle.error) << te;
    });
  }
}

// Unambiguous framing stays readable on both paths: chunked alone, and a final
// coding other than chunked, whose body RFC 9112 §6.3 delimits by the server
// closing the connection (unlike a request, which must be rejected).
TEST(ClientResponseSmugglingTest, UnambiguousFramingAccepted) {
  for (const char *response : {"HTTP/1.1 200 OK\r\n"
                               "Transfer-Encoding: chunked\r\n"
                               "Connection: close\r\n"
                               "\r\n"
                               "5\r\nhello\r\n0\r\n\r\n",
                               "HTTP/1.1 200 OK\r\n"
                               "Transfer-Encoding: gzip\r\n"
                               "Connection: close\r\n"
                               "\r\n"
                               "hello"}) {
    with_single_response(response, [&](Client &cli) {
      auto res = cli.Get("/");
      ASSERT_TRUE(static_cast<bool>(res)) << response;
      EXPECT_EQ("hello", res->body);
    });

    with_single_response(response, [&](Client &cli) {
      auto handle = cli.open_stream("GET", "/");
      ASSERT_TRUE(handle.is_valid()) << response;
      EXPECT_EQ("hello", read_all(handle));
    });
  }
}

// A response to HEAD, and a 204 or 304 response, carries no body, so its
// framing headers describe nothing to read and must not be rejected.
TEST(ClientResponseSmugglingTest, BodylessResponseNotRejected) {
  const std::string framing = "Content-Length: 5\r\n"
                              "Transfer-Encoding: chunked\r\n"
                              "Connection: close\r\n"
                              "\r\n";

  with_single_response("HTTP/1.1 200 OK\r\n" + framing, [](Client &cli) {
    EXPECT_TRUE(static_cast<bool>(cli.Head("/")));
  });
  with_single_response("HTTP/1.1 200 OK\r\n" + framing, [](Client &cli) {
    EXPECT_TRUE(cli.open_stream("HEAD", "/").is_valid());
  });

  for (const char *status : {"204 No Content", "304 Not Modified"}) {
    auto response = std::string("HTTP/1.1 ") + status + "\r\n" + framing;

    with_single_response(response, [&](Client &cli) {
      EXPECT_TRUE(static_cast<bool>(cli.Get("/"))) << status;
    });
    with_single_response(response, [&](Client &cli) {
      EXPECT_TRUE(cli.open_stream("GET", "/").is_valid()) << status;
    });
  }
}

// RFC 9112 6.3: a response to HEAD, and a 204 or 304 response, ends with its
// header section, so a stream opened on one has nothing to read, whatever
// framing or coding headers it carries.
TEST(ClientResponseSmugglingTest, BodylessResponseStreamEndsAtOnce) {
  struct Case {
    const char *method;
    const char *status;
  };
  // A reader of the declared body reports an early close when nothing
  // follows, and hands back what does.
  struct Framing {
    const char *headers;
    const char *after;
  };
  for (const auto &c : {Case{"HEAD", "200 OK"}, Case{"GET", "204 No Content"},
                        Case{"GET", "304 Not Modified"}}) {
    for (const auto &f :
         {Framing{"Content-Length: 5\r\n", ""},
          Framing{"Content-Length: 5\r\n", "hello"},
          Framing{"Transfer-Encoding: chunked\r\n", ""},
          Framing{"Transfer-Encoding: chunked\r\n", "5\r\nhello\r\n0\r\n\r\n"},
          // Not decoded, so a build without Brotli opens it too
          Framing{"Content-Encoding: br\r\n", ""}}) {
      auto response = std::string("HTTP/1.1 ") + c.status + "\r\n" + f.headers +
                      "Connection: close\r\n"
                      "\r\n" +
                      f.after;
      with_single_response(response, [&](Client &cli) {
        auto handle = cli.open_stream(c.method, "/");
        ASSERT_TRUE(handle.is_valid()) << c.method << ' ' << response;
        EXPECT_EQ("", read_all(handle)) << c.method << ' ' << response;
        EXPECT_FALSE(handle.has_read_error()) << c.method << ' ' << response;
      });
    }
  }
}

// RFC 9112 6.1: Transfer-Encoding next to a Content-Length, or in an HTTP/1.0
// response, is faulty framing, so the connection is not reused after it.
TEST(ClientResponseSmugglingTest, FaultyTransferEncodingClosesConnection) {
  for (const char *response : {"HTTP/1.1 200 OK\r\n"
                               "Content-Length: 0\r\n"
                               "Transfer-Encoding: chunked\r\n"
                               "\r\n"
                               "5\r\nhello\r\n0\r\n\r\n",
                               "HTTP/1.0 200 Connection established\r\n"
                               "Connection: keep-alive\r\n"
                               "Transfer-Encoding: chunked\r\n"
                               "\r\n"
                               "5\r\nhello\r\n0\r\n\r\n"}) {
    with_single_response(response, [&](Client &cli) {
      cli.set_keep_alive(true);
      auto res = cli.Get("/");
      ASSERT_TRUE(res) << response;
      EXPECT_EQ("hello", res->body);
      EXPECT_FALSE(cli.is_socket_open()) << response;
    });
  }
}

// A payload max length of 0 means no limit, however the body is framed.
TEST(PayloadMaxLengthZeroTest, ClientReadsChunkedAndUnframedResponse) {
  for (const char *response : {"HTTP/1.1 200 OK\r\n"
                               "Transfer-Encoding: chunked\r\n"
                               "\r\n"
                               "5\r\nhello\r\n0\r\n\r\n",
                               "HTTP/1.1 200 OK\r\n"
                               "Connection: close\r\n"
                               "\r\n"
                               "hello"}) {
    with_single_response(response, [&](Client &cli) {
      cli.set_payload_max_length(0);
      auto res = cli.Get("/");
      ASSERT_TRUE(res) << response;
      EXPECT_EQ("hello", res->body) << response;
    });
  }
}

TEST(PayloadMaxLengthZeroTest, ServerReadsChunkedRequest) {
  Server svr;
  svr.set_payload_max_length(0);
  svr.Post("/echo", [](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Post(
      "/echo",
      [](size_t /*offset*/, DataSink &sink) {
        sink.write("hello", 5);
        sink.done();
        return true;
      },
      "text/plain");
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("hello", res->body);
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST_F(OpenStreamTest, Gzip) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/compressible", {},
                                {{"Accept-Encoding", "gzip"}});
  EXPECT_EQ("gzip", handle.response->get_header_value("Content-Encoding"));
  EXPECT_EQ(100u * 1024u, read_all(handle).size());
}

TEST_F(OpenStreamTest, TrailersWithGzip) {
  Client cli("127.0.0.1", port_);
  auto handle =
      cli.open_stream("GET", "/streamed-chunked-with-prohibited-trailer", {},
                      {{"Accept-Encoding", "gzip"}});
  ASSERT_TRUE(handle.is_valid());
  EXPECT_EQ("gzip", handle.response->get_header_value("Content-Encoding"));
  EXPECT_EQ("123456789", read_all(handle));
  EXPECT_EQ("yes", handle.response->get_trailer_value("X-Allowed"));
}
#endif

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
TEST_F(OpenStreamTest, Brotli) {
  Client cli("127.0.0.1", port_);
  auto handle =
      cli.open_stream("GET", "/compressible", {}, {{"Accept-Encoding", "br"}});
  EXPECT_EQ("br", handle.response->get_header_value("Content-Encoding"));
  EXPECT_EQ(100u * 1024u, read_all(handle).size());
}
#endif

#ifdef CPPHTTPLIB_ZSTD_SUPPORT
TEST_F(OpenStreamTest, Zstd) {
  Client cli("127.0.0.1", port_);
  auto handle = cli.open_stream("GET", "/compressible", {},
                                {{"Accept-Encoding", "zstd"}});
  EXPECT_EQ("zstd", handle.response->get_header_value("Content-Encoding"));
  EXPECT_EQ(100u * 1024u, read_all(handle).size());
}
#endif

#ifdef CPPHTTPLIB_SSL_ENABLED
class SSLOpenStreamTest : public ::testing::Test {
protected:
  SSLOpenStreamTest() : svr_("cert.pem", "key.pem") {}
  void SetUp() override {
    svr_.Get("/hello", [](const Request &, Response &res) {
      res.set_content("Hello SSL World!", "text/plain");
    });
    svr_.Get("/chunked", [](const Request &, Response &res) {
      res.set_chunked_content_provider("text/plain",
                                       [](size_t offset, DataSink &sink) {
                                         if (offset < 15) {
                                           sink.write("chunk", 5);
                                           return true;
                                         }
                                         sink.done();
                                         return true;
                                       });
    });
    svr_.Post("/echo", [](const Request &req, Response &res) {
      res.set_content(req.body, req.get_header_value("Content-Type"));
    });
    svr_.Post("/chunked-response", [](const Request &req, Response &res) {
      std::string body = req.body;
      res.set_chunked_content_provider(
          "text/plain", [body](size_t offset, DataSink &sink) {
            if (offset < body.size()) {
              sink.write(body.data() + offset, body.size() - offset);
            }
            sink.done();
            return true;
          });
    });
    port_ = svr_.bind_to_any_port("127.0.0.1");
    thread_ = std::thread([this]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }
  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) thread_.join();
  }
  SSLServer svr_;
  std::thread thread_;
  int port_ = 0;
};

TEST_F(SSLOpenStreamTest, Basic) {
  SSLClient cli("127.0.0.1", port_);
  cli.enable_server_certificate_verification(false);
  auto handle = cli.open_stream("GET", "/hello");
  ASSERT_TRUE(handle.is_valid());
  EXPECT_EQ("Hello SSL World!", read_all(handle));
}

TEST_F(SSLOpenStreamTest, Chunked) {
  SSLClient cli("127.0.0.1", port_);
  cli.enable_server_certificate_verification(false);

  auto handle = cli.open_stream("GET", "/chunked");

  ASSERT_TRUE(handle.is_valid()) << "Error: " << static_cast<int>(handle.error);
  EXPECT_TRUE(handle.response && handle.response->get_header_value(
                                     "Transfer-Encoding") == "chunked");

  auto body = read_all(handle);
  EXPECT_EQ("chunkchunkchunk", body);
}

TEST_F(SSLOpenStreamTest, Post) {
  SSLClient cli("127.0.0.1", port_);
  cli.enable_server_certificate_verification(false);

  auto handle =
      cli.open_stream("POST", "/echo", {}, {}, "Hello SSL POST", "text/plain");

  ASSERT_TRUE(handle.is_valid()) << "Error: " << static_cast<int>(handle.error);
  EXPECT_EQ(200, handle.response->status);

  auto body = read_all(handle);
  EXPECT_EQ("Hello SSL POST", body);
}

TEST_F(SSLOpenStreamTest, PostChunked) {
  SSLClient cli("127.0.0.1", port_);
  cli.enable_server_certificate_verification(false);

  auto handle = cli.open_stream("POST", "/chunked-response", {}, {},
                                "Chunked SSL Data", "text/plain");

  ASSERT_TRUE(handle.is_valid());
  EXPECT_EQ(200, handle.response->status);

  auto body = read_all(handle);
  EXPECT_EQ("Chunked SSL Data", body);
}

// RFC 7230 §3.3: a response body with neither chunked Transfer-Encoding nor
// Content-Length is terminated by the server closing the connection.  When the
// SSL peer sends a close_notify after the body, the client must treat it as a
// clean EOF and return a successful response rather than an error.
TEST(SSLTest, ResponseBodyTerminatedByConnectionClose) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.set_keep_alive_max_count(1);

  const std::string expected_body = "Hello from connection-close response!";

  svr.Get("/no-content-length", [&](const Request & /*req*/, Response &res) {
    res.set_content_provider("text/plain",
                             [&](size_t offset, DataSink &sink) -> bool {
                               if (offset < expected_body.size()) {
                                 sink.write(expected_body.data() + offset,
                                            expected_body.size() - offset);
                               }
                               sink.done();
                               return true;
                             });
  });

  auto listen_thread = std::thread([&svr] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  SSLClient cli(HOST, PORT);
  cli.enable_server_certificate_verification(false);

  auto res = cli.Get("/no-content-length");

  ASSERT_TRUE(res) << "Request failed: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ(expected_body, res->body);
}
#endif // CPPHTTPLIB_SSL_ENABLED

//==============================================================================
// Parity Tests: ensure streaming and non-streaming APIs produce identical
// results for various scenarios.
//==============================================================================

TEST(ParityTest, GetVsOpenStream) {
  Server svr;

  const std::string path = "/parity";
  const std::string content = "Parity test content: hello world";

  svr.Get(path, [&](const Request & /*req*/, Response &res) {
    res.set_content(content, "text/plain");
  });

  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // Non-stream path
  auto r1 = cli.Get(path);
  ASSERT_TRUE(r1);
  EXPECT_EQ(StatusCode::OK_200, r1->status);

  // Stream path
  auto h = cli.open_stream("GET", path);
  ASSERT_TRUE(h.is_valid());

  EXPECT_EQ(r1->body, read_all(h));
}

// Helper to compress data with provided compressor type T
template <typename Compressor>
static std::string compress_payload_for_parity(const std::string &in) {
  std::string out;
  Compressor compressor;
  bool ok = compressor.compress(in.data(), in.size(), /*last=*/true,
                                [&](const char *data, size_t n) {
                                  out.append(data, n);
                                  return true;
                                });
  EXPECT_TRUE(ok);
  return out;
}

// Helper function for compression parity tests
template <typename Compressor>
static void test_compression_parity(const std::string &original,
                                    const std::string &path,
                                    const std::string &encoding) {
  const std::string compressed =
      compress_payload_for_parity<Compressor>(original);

  Server svr;

  svr.Get(path, [&](const Request & /*req*/, Response &res) {
    res.set_content(compressed, "application/octet-stream");
    res.set_header("Content-Encoding", encoding);
  });

  auto t = std::thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // Non-streaming
  {
    auto res = cli.Get(path);
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
    EXPECT_EQ(original, res->body);
  }

  // Streaming
  {
    auto h = cli.open_stream("GET", path);
    ASSERT_TRUE(h.is_valid());
    EXPECT_EQ(original, read_all(h));
  }
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST(ParityTest, Gzip) {
  test_compression_parity<detail::gzip_compressor>(
      "The quick brown fox jumps over the lazy dog", "/parity-gzip", "gzip");
}
#endif

#ifdef CPPHTTPLIB_BROTLI_SUPPORT
TEST(ParityTest, Brotli) {
  test_compression_parity<detail::brotli_compressor>(
      "Hello, brotli parity test payload", "/parity-br", "br");
}
#endif

#ifdef CPPHTTPLIB_ZSTD_SUPPORT
TEST(ParityTest, Zstd) {
  test_compression_parity<detail::zstd_compressor>(
      "Zstandard parity test payload", "/parity-zstd", "zstd");
}
#endif

//==============================================================================
// New Stream API Tests
//==============================================================================

inline std::string read_body(httplib::stream::Result &result) {
  std::string body;
  while (result.next()) {
    body.append(result.data(), result.size());
  }
  return body;
}

TEST(ClientConnectionTest, Basic) {
  httplib::ClientConnection conn;
  EXPECT_FALSE(conn.is_open());
  conn.sock = 1;
  EXPECT_TRUE(conn.is_open());
  httplib::ClientConnection conn2(std::move(conn));
  EXPECT_EQ(INVALID_SOCKET, conn.sock);
  conn2.sock = INVALID_SOCKET;
}

// Unified test server for all stream::* tests
class StreamApiTest : public ::testing::Test {
protected:
  void SetUp() override {
    svr_.Get("/hello", [](const httplib::Request &, httplib::Response &res) {
      res.set_content("Hello World!", "text/plain");
    });
    svr_.Get("/echo-params",
             [](const httplib::Request &req, httplib::Response &res) {
               std::string r;
               for (const auto &p : req.params) {
                 if (!r.empty()) r += "&";
                 r += p.first + "=" + p.second;
               }
               res.set_content(r, "text/plain");
             });
    svr_.Post("/echo", [](const httplib::Request &req, httplib::Response &res) {
      res.set_content(req.body, req.get_header_value("Content-Type"));
    });
    svr_.Post("/echo-headers",
              [](const httplib::Request &req, httplib::Response &res) {
                std::string r;
                for (const auto &h : req.headers)
                  r += h.first + ": " + h.second + "\n";
                res.set_content(r, "text/plain");
              });
    svr_.Post("/echo-params",
              [](const httplib::Request &req, httplib::Response &res) {
                std::string r = "params:";
                for (const auto &p : req.params)
                  r += p.first + "=" + p.second + ";";
                res.set_content(r + " body:" + req.body, "text/plain");
              });
    svr_.Post("/large", [](const httplib::Request &, httplib::Response &res) {
      res.set_content(std::string(100 * 1024, 'X'), "application/octet-stream");
    });
    svr_.Put("/echo", [](const httplib::Request &req, httplib::Response &res) {
      res.set_content("PUT:" + req.body, "text/plain");
    });
    svr_.Patch("/echo",
               [](const httplib::Request &req, httplib::Response &res) {
                 res.set_content("PATCH:" + req.body, "text/plain");
               });
    svr_.Delete(
        "/resource", [](const httplib::Request &req, httplib::Response &res) {
          res.set_content(req.body.empty() ? "Deleted" : "Deleted:" + req.body,
                          "text/plain");
        });
    svr_.Get("/head-test",
             [](const httplib::Request &, httplib::Response &res) {
               res.set_content("body for HEAD", "text/plain");
             });
    svr_.Options("/options",
                 [](const httplib::Request &, httplib::Response &res) {
                   res.set_header("Allow", "GET, POST, PUT, DELETE, OPTIONS");
                 });
    thread_ = std::thread([this]() { svr_.listen(HOST, PORT); });
    svr_.wait_until_ready();
  }
  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) thread_.join();
  }
  httplib::Server svr_;
  std::thread thread_;
};

// stream::Get tests
TEST_F(StreamApiTest, GetBasic) {
  httplib::Client cli(HOST, PORT);
  auto result = httplib::stream::Get(cli, "/hello");
  ASSERT_TRUE(result.is_valid());
  EXPECT_EQ(200, result.status());
  EXPECT_EQ("Hello World!", read_body(result));
}

TEST_F(StreamApiTest, GetWithParams) {
  httplib::Client cli(HOST, PORT);
  httplib::Params params{{"foo", "bar"}};
  auto result = httplib::stream::Get(cli, "/echo-params", params);
  ASSERT_TRUE(result.is_valid());
  EXPECT_TRUE(read_body(result).find("foo=bar") != std::string::npos);
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST_F(StreamApiTest, GetCompressedWithNoPayloadLimit) {
  httplib::Client cli(HOST, PORT);
  cli.set_payload_max_length(0);
  auto result = httplib::stream::Get(cli, "/hello");
  ASSERT_TRUE(result.is_valid());
  EXPECT_FALSE(result.get_header_value("Content-Encoding").empty());
  EXPECT_EQ("Hello World!", read_body(result));
}
#endif

TEST_F(StreamApiTest, GetConnectionError) {
  httplib::Client cli(HOST, 9999);
  EXPECT_FALSE(httplib::stream::Get(cli, "/hello").is_valid());
}

TEST_F(StreamApiTest, Get404) {
  httplib::Client cli(HOST, PORT);
  auto result = httplib::stream::Get(cli, "/nonexistent");
  EXPECT_TRUE(result.is_valid());
  EXPECT_EQ(404, result.status());
}

// stream::Post tests
TEST_F(StreamApiTest, PostBasic) {
  httplib::Client cli(HOST, PORT);
  auto result = httplib::stream::Post(cli, "/echo", R"({"key":"value"})",
                                      "application/json");
  ASSERT_TRUE(result.is_valid());
  EXPECT_EQ("application/json", result.get_header_value("Content-Type"));
  EXPECT_EQ(R"({"key":"value"})", read_body(result));
}

TEST_F(StreamApiTest, PostWithHeaders) {
  httplib::Client cli(HOST, PORT);
  httplib::Headers headers{{"X-Custom", "value"}};
  auto result = httplib::stream::Post(cli, "/echo-headers", headers, "body",
                                      "text/plain");
  EXPECT_TRUE(read_body(result).find("X-Custom: value") != std::string::npos);
}

TEST_F(StreamApiTest, PostWithParams) {
  httplib::Client cli(HOST, PORT);
  httplib::Params params{{"k", "v"}};
  auto result =
      httplib::stream::Post(cli, "/echo-params", params, "data", "text/plain");
  auto body = read_body(result);
  EXPECT_TRUE(body.find("k=v") != std::string::npos);
  EXPECT_TRUE(body.find("body:data") != std::string::npos);
}

TEST_F(StreamApiTest, PostLarge) {
  httplib::Client cli(HOST, PORT);
  auto result = httplib::stream::Post(cli, "/large", "", "text/plain");
  size_t total = 0;
  while (result.next()) {
    total += result.size();
  }
  EXPECT_EQ(100u * 1024u, total);
}

// stream::Put/Patch tests
TEST_F(StreamApiTest, PutAndPatch) {
  httplib::Client cli(HOST, PORT);
  auto put = httplib::stream::Put(cli, "/echo", "test", "text/plain");
  EXPECT_EQ("PUT:test", read_body(put));
  auto patch = httplib::stream::Patch(cli, "/echo", "test", "text/plain");
  EXPECT_EQ("PATCH:test", read_body(patch));
}

// stream::Delete tests
TEST_F(StreamApiTest, Delete) {
  httplib::Client cli(HOST, PORT);
  auto del1 = httplib::stream::Delete(cli, "/resource");
  EXPECT_EQ("Deleted", read_body(del1));
  auto del2 = httplib::stream::Delete(cli, "/resource", "data", "text/plain");
  EXPECT_EQ("Deleted:data", read_body(del2));
}

// stream::Head/Options tests
TEST_F(StreamApiTest, HeadAndOptions) {
  httplib::Client cli(HOST, PORT);
  auto head = httplib::stream::Head(cli, "/head-test");
  EXPECT_TRUE(head.is_valid());
  EXPECT_FALSE(head.get_header_value("Content-Length").empty());

  auto opts = httplib::stream::Options(cli, "/options");
  EXPECT_EQ("GET, POST, PUT, DELETE, OPTIONS", opts.get_header_value("Allow"));
}

// SSL stream::* tests
#ifdef CPPHTTPLIB_SSL_ENABLED
class SSLStreamApiTest : public ::testing::Test {
protected:
  void SetUp() override {
    svr_.Get("/hello", [](const httplib::Request &, httplib::Response &res) {
      res.set_content("Hello SSL!", "text/plain");
    });
    svr_.Post("/echo", [](const httplib::Request &req, httplib::Response &res) {
      res.set_content(req.body, "text/plain");
    });
    port_ = svr_.bind_to_any_port("127.0.0.1");
    thread_ = std::thread([this]() { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }
  void TearDown() override {
    svr_.stop();
    if (thread_.joinable()) thread_.join();
  }
  httplib::SSLServer svr_{"cert.pem", "key.pem"};
  std::thread thread_;
  int port_ = 0;
};

TEST_F(SSLStreamApiTest, GetAndPost) {
  httplib::SSLClient cli("127.0.0.1", port_);
  cli.enable_server_certificate_verification(false);
  auto get = httplib::stream::Get(cli, "/hello");
  EXPECT_EQ("Hello SSL!", read_body(get));
  auto post = httplib::stream::Post(cli, "/echo", "test", "text/plain");
  EXPECT_EQ("test", read_body(post));
}
#endif

// Tests for Error::Timeout and Error::ConnectionClosed error types
// These errors are set in SocketStream/SSLSocketStream and propagated through
// BodyReader

TEST(ErrorHandlingTest, StreamReadTimeout) {
  // Test that read timeout during streaming is detected
  // Use a large content-length response where server delays mid-stream
  Server svr;

  svr.Get("/slow-stream", [](const Request &, Response &res) {
    // Send a large response with delay in the middle
    res.set_content_provider(
        1000, // content_length
        "text/plain", [](size_t offset, size_t /*length*/, DataSink &sink) {
          if (offset < 100) {
            // Send first 100 bytes immediately
            std::string data(100, 'A');
            sink.write(data.c_str(), data.size());
            return true;
          }
          // Then delay longer than client timeout
          std::this_thread::sleep_for(std::chrono::seconds(3));
          std::string data(900, 'B');
          sink.write(data.c_str(), data.size());
          return true;
        });
  });

  auto port = 8091;
  std::thread t([&]() { svr.listen("localhost", port); });
  svr.wait_until_ready();

  Client cli("localhost", port);
  cli.set_read_timeout(1, 0); // 1 second timeout

  auto handle = cli.open_stream("GET", "/slow-stream");
  ASSERT_TRUE(handle.is_valid());

  char buf[256];
  ssize_t total = 0;
  ssize_t n;
  bool got_error = false;

  while ((n = handle.read(buf, sizeof(buf))) > 0) {
    total += n;
  }

  if (n < 0) {
    got_error = true;
    // Should be timeout or read error
    EXPECT_TRUE(handle.get_read_error() == Error::Timeout ||
                handle.get_read_error() == Error::Read)
        << "Actual error: " << to_string(handle.get_read_error());
  }

  // Either we got an error, or we got less data than expected
  EXPECT_TRUE(got_error || total < 1000)
      << "Expected timeout but got all " << total << " bytes";

  svr.stop();
  t.join();
}

TEST(ErrorHandlingTest, StreamConnectionClosed) {
  // Test connection closed detection via BodyReader
  Server svr;
  std::atomic<bool> close_now{false};

  svr.Get("/will-close", [&](const Request &, Response &res) {
    res.set_content_provider(
        10000, // Large content_length that we won't fully send
        "text/plain", [&](size_t offset, size_t /*length*/, DataSink &sink) {
          if (offset < 100) {
            std::string data(100, 'X');
            sink.write(data.c_str(), data.size());
            return true;
          }
          // Wait for signal then abort
          while (!close_now) {
            std::this_thread::sleep_for(std::chrono::milliseconds(10));
          }
          return false; // Abort - server will close connection
        });
  });

  auto port = 8092;
  std::thread t([&]() { svr.listen("localhost", port); });
  svr.wait_until_ready();

  Client cli("localhost", port);
  auto handle = cli.open_stream("GET", "/will-close");
  ASSERT_TRUE(handle.is_valid());

  char buf[256];
  ssize_t n = handle.read(buf, sizeof(buf)); // First read
  EXPECT_GT(n, 0) << "First read should succeed";

  // Signal server to close
  close_now = true;

  // Keep reading until error or EOF
  while ((n = handle.read(buf, sizeof(buf))) > 0) {
    // Keep reading
  }

  // Should get an error since content_length wasn't satisfied
  if (n < 0) {
    EXPECT_TRUE(handle.get_read_error() == Error::ConnectionClosed ||
                handle.get_read_error() == Error::Read)
        << "Actual error: " << to_string(handle.get_read_error());
  }

  svr.stop();
  t.join();
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(ErrorHandlingTest, SSLStreamReadTimeout) {
  // Test that read timeout during SSL streaming is detected
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);

  svr.Get("/slow-stream", [](const Request &, Response &res) {
    res.set_content_provider(
        1000, "text/plain",
        [](size_t offset, size_t /*length*/, DataSink &sink) {
          if (offset < 100) {
            std::string data(100, 'A');
            sink.write(data.c_str(), data.size());
            return true;
          }
          std::this_thread::sleep_for(std::chrono::seconds(3));
          std::string data(900, 'B');
          sink.write(data.c_str(), data.size());
          return true;
        });
  });

  auto port = 8093;
  std::thread t([&]() { svr.listen("localhost", port); });
  svr.wait_until_ready();

  SSLClient cli("localhost", port);
  cli.enable_server_certificate_verification(false);
  cli.set_read_timeout(1, 0); // 1 second timeout

  auto handle = cli.open_stream("GET", "/slow-stream");
  ASSERT_TRUE(handle.is_valid());

  char buf[256];
  ssize_t total = 0;
  ssize_t n;
  bool got_error = false;

  while ((n = handle.read(buf, sizeof(buf))) > 0) {
    total += n;
  }

  if (n < 0) {
    got_error = true;
    EXPECT_TRUE(handle.get_read_error() == Error::Timeout ||
                handle.get_read_error() == Error::Read)
        << "Actual error: " << to_string(handle.get_read_error());
  }

  EXPECT_TRUE(got_error || total < 1000)
      << "Expected timeout but got all " << total << " bytes";

  svr.stop();
  t.join();
}

TEST(ErrorHandlingTest, SSLStreamConnectionClosed) {
  // Test SSL connection closed detection
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  std::atomic<bool> close_now{false};

  svr.Get("/will-close", [&](const Request &, Response &res) {
    res.set_content_provider(
        10000, "text/plain",
        [&](size_t offset, size_t /*length*/, DataSink &sink) {
          if (offset < 100) {
            std::string data(100, 'X');
            sink.write(data.c_str(), data.size());
            return true;
          }
          while (!close_now) {
            std::this_thread::sleep_for(std::chrono::milliseconds(10));
          }
          return false;
        });
  });

  auto port = 8094;
  std::thread t([&]() { svr.listen("localhost", port); });
  svr.wait_until_ready();

  SSLClient cli("localhost", port);
  cli.enable_server_certificate_verification(false);
  auto handle = cli.open_stream("GET", "/will-close");
  ASSERT_TRUE(handle.is_valid());

  char buf[256];
  ssize_t n = handle.read(buf, sizeof(buf)); // First read
  EXPECT_GT(n, 0);

  // Signal server to close
  close_now = true;

  while ((n = handle.read(buf, sizeof(buf))) > 0) {
    // Keep reading
  }

  if (n < 0) {
    EXPECT_TRUE(handle.get_read_error() == Error::ConnectionClosed ||
                handle.get_read_error() == Error::Read)
        << "Actual error: " << to_string(handle.get_read_error());
  }

  svr.stop();
  t.join();
}
#endif

TEST(ETagTest, StaticFileETagAndIfNoneMatch) {
  using namespace httplib;

  // Create a test file
  const char *fname = "etag_testfile.txt";
  const char *content = "etag-content";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen("localhost", PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // First request: should get 200 with ETag header
  auto res1 = cli.Get("/static/etag_testfile.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("ETag"));
  std::string etag = res1->get_header_value("ETag");
  EXPECT_FALSE(etag.empty());

  // Verify ETag format: W/"hex-hex"
  ASSERT_GE(etag.length(), 5u); // Minimum: W/""
  EXPECT_EQ('W', etag[0]);
  EXPECT_EQ('/', etag[1]);
  EXPECT_EQ('"', etag[2]);
  EXPECT_EQ('"', etag.back());

  // Exact match: expect 304 Not Modified
  Headers h2 = {{"If-None-Match", etag}};
  auto res2 = cli.Get("/static/etag_testfile.txt", h2);
  ASSERT_TRUE(res2);
  EXPECT_EQ(304, res2->status);

  // Wildcard match: expect 304 Not Modified
  Headers h3 = {{"If-None-Match", "*"}};
  auto res3 = cli.Get("/static/etag_testfile.txt", h3);
  ASSERT_TRUE(res3);
  EXPECT_EQ(304, res3->status);

  // Non-matching ETag: expect 200
  Headers h4 = {{"If-None-Match", "W/\"deadbeef\""}};
  auto res4 = cli.Get("/static/etag_testfile.txt", h4);
  ASSERT_TRUE(res4);
  EXPECT_EQ(200, res4->status);

  // Multiple ETags with one matching: expect 304
  Headers h5 = {{"If-None-Match", "W/\"other\", " + etag + ", W/\"another\""}};
  auto res5 = cli.Get("/static/etag_testfile.txt", h5);
  ASSERT_TRUE(res5);
  EXPECT_EQ(304, res5->status);

  // The ETag list split over several field lines: RFC 9110 Section 5.3 makes
  // that equivalent to the single comma-separated list above, so the match on
  // the second line must still be found.
  Headers h6;
  h6.emplace("If-None-Match", "W/\"other\"");
  h6.emplace("If-None-Match", etag);
  auto res6 = cli.Get("/static/etag_testfile.txt", h6);
  ASSERT_TRUE(res6);
  EXPECT_EQ(304, res6->status);

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, StaticFileETagIfNoneMatchStarNotFound) {
  using namespace httplib;

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // Send If-None-Match: * to a non-existent file
  Headers h = {{"If-None-Match", "*"}};
  auto res = cli.Get("/static/etag_testfile_notfound.txt", h);
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(404, res->status);

  svr.stop();
  t.join();
}

TEST(ETagTest, IfNoneMatchBoundaryCheck) {
  using namespace httplib;

  // Create a test file
  const char *fname = "etag_boundary_testfile.txt";
  const char *content = "boundary-test";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen("localhost", PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // Get the actual ETag
  auto res1 = cli.Get("/static/etag_boundary_testfile.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("ETag"));
  std::string etag = res1->get_header_value("ETag");

  // Test 1: Very long ETag value (longer than actual ETag)
  // Should NOT match and return 200 (not trigger out-of-bounds read)
  Headers h1 = {{"If-None-Match", "W/"
                                  "\"very-long-etag-value-that-is-much-longer-"
                                  "than-the-actual-etag-value\""}};
  auto res2 = cli.Get("/static/etag_boundary_testfile.txt", h1);
  ASSERT_TRUE(res2);
  EXPECT_EQ(200, res2->status); // Should not match

  // Test 2: Long string followed by wildcard
  // Should match on "*" and return 304 (without out-of-bounds read on the long
  // string)
  Headers h2 = {{"If-None-Match", "W/\"another-very-long-value\", *"}};
  auto res3 = cli.Get("/static/etag_boundary_testfile.txt", h2);
  ASSERT_TRUE(res3);
  EXPECT_EQ(304, res3->status); // Should match on "*"

  // Test 3: Wildcard followed by long string
  // Should match on "*" immediately and return 304
  Headers h3 = {{"If-None-Match", "*, W/\"long-value-after-wildcard\""}};
  auto res4 = cli.Get("/static/etag_boundary_testfile.txt", h3);
  ASSERT_TRUE(res4);
  EXPECT_EQ(304, res4->status); // Should match on "*"

  // Test 4: Multiple long non-matching values
  // Should NOT match and return 200 (test that all comparisons are safe)
  Headers h4 = {{"If-None-Match", "W/\"first-long-non-matching-value\", "
                                  "W/\"second-long-non-matching-value\", "
                                  "W/\"third-long-non-matching-value\""}};
  auto res5 = cli.Get("/static/etag_boundary_testfile.txt", h4);
  ASSERT_TRUE(res5);
  EXPECT_EQ(200, res5->status); // Should not match

  // Test 5: Single character that is not "*" (edge case)
  Headers h5 = {{"If-None-Match", "X"}};
  auto res6 = cli.Get("/static/etag_boundary_testfile.txt", h5);
  ASSERT_TRUE(res6);
  EXPECT_EQ(200, res6->status); // Should not match

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, LastModifiedAndIfModifiedSince) {
  using namespace httplib;

  // Create a test file
  const char *fname = "ims_testfile.txt";
  const char *content = "if-modified-since-test";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // First request: should get 200 with Last-Modified header
  auto res1 = cli.Get("/static/ims_testfile.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("Last-Modified"));
  std::string last_modified = res1->get_header_value("Last-Modified");
  EXPECT_FALSE(last_modified.empty());

  // If-Modified-Since with same time: expect 304
  Headers h2 = {{"If-Modified-Since", last_modified}};
  auto res2 = cli.Get("/static/ims_testfile.txt", h2);
  ASSERT_TRUE(res2);
  EXPECT_EQ(304, res2->status);

  // If-Modified-Since with future time: expect 304
  Headers h3 = {{"If-Modified-Since", "Sun, 01 Jan 2099 00:00:00 GMT"}};
  auto res3 = cli.Get("/static/ims_testfile.txt", h3);
  ASSERT_TRUE(res3);
  EXPECT_EQ(304, res3->status);

  // If-Modified-Since with past time: expect 200
  Headers h4 = {{"If-Modified-Since", "Sun, 01 Jan 2000 00:00:00 GMT"}};
  auto res4 = cli.Get("/static/ims_testfile.txt", h4);
  ASSERT_TRUE(res4);
  EXPECT_EQ(200, res4->status);

  // If-None-Match takes precedence over If-Modified-Since
  // (send matching ETag with old If-Modified-Since -> should still be 304)
  ASSERT_TRUE(res1->has_header("ETag"));
  std::string etag = res1->get_header_value("ETag");
  Headers h5 = {{"If-None-Match", etag},
                {"If-Modified-Since", "Sun, 01 Jan 2000 00:00:00 GMT"}};
  auto res5 = cli.Get("/static/ims_testfile.txt", h5);
  ASSERT_TRUE(res5);
  EXPECT_EQ(304, res5->status);

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, VaryAcceptEncodingWithCompression) {
  using namespace httplib;

  Server svr;

  // Endpoint that returns compressible content
  svr.Get("/compressible", [](const Request &, Response &res) {
    // Return a large enough body to trigger compression
    std::string body(1000, 'a');
    res.set_content(body, "text/plain");
  });

  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // Request with gzip support: should get Vary header when compressed
  cli.set_compress(true);
  auto res1 = cli.Get("/compressible");
  ASSERT_TRUE(res1);
  EXPECT_EQ(200, res1->status);

  // If Content-Encoding is set, Vary should also be set
  if (res1->has_header("Content-Encoding")) {
    EXPECT_TRUE(res1->has_header("Vary"));
    EXPECT_EQ("Accept-Encoding", res1->get_header_value("Vary"));
  }

  // Request without Accept-Encoding header: should not have compression
  Headers h_no_compress;
  auto res2 = cli.Get("/compressible", h_no_compress);
  ASSERT_TRUE(res2);
  EXPECT_EQ(200, res2->status);

  // Verify Vary header is present when compression is applied
  // (the exact behavior depends on server configuration)

  svr.stop();
  t.join();
}

TEST(ETagTest, IfRangeWithETag) {
  using namespace httplib;

  // Create a test file with known content
  const char *fname = "if_range_testfile.txt";
  const std::string content = "0123456789ABCDEFGHIJ"; // 20 bytes
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // First request: get ETag
  auto res1 = cli.Get("/static/if_range_testfile.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("ETag"));
  std::string etag = res1->get_header_value("ETag");

  // RFC 9110 Section 13.1.5: If-Range requires strong ETag comparison.
  // Since our server generates weak ETags (W/"..."), If-Range with our
  // ETag should NOT result in partial content - it should return full content.
  Headers h2 = {{"Range", "bytes=0-4"}, {"If-Range", etag}};
  auto res2 = cli.Get("/static/if_range_testfile.txt", h2);
  ASSERT_TRUE(res2);
  // Weak ETag in If-Range -> full content (200), not partial (206)
  EXPECT_EQ(200, res2->status);
  EXPECT_EQ(content, res2->body);
  EXPECT_FALSE(res2->has_header("Content-Range"));

  // Range request with non-matching If-Range (ETag): should get 200 (full
  // content)
  Headers h3 = {{"Range", "bytes=0-4"}, {"If-Range", "W/\"wrong-etag\""}};
  auto res3 = cli.Get("/static/if_range_testfile.txt", h3);
  ASSERT_TRUE(res3);
  EXPECT_EQ(200, res3->status);
  EXPECT_EQ(content, res3->body);
  EXPECT_FALSE(res3->has_header("Content-Range"));

  // Range request with strong ETag (hypothetical - our server doesn't generate
  // strong ETags, but if client sends a strong ETag that doesn't match, it
  // should return full content)
  Headers h4 = {{"Range", "bytes=0-4"}, {"If-Range", "\"strong-etag\""}};
  auto res4 = cli.Get("/static/if_range_testfile.txt", h4);
  ASSERT_TRUE(res4);
  EXPECT_EQ(200, res4->status);
  EXPECT_EQ(content, res4->body);
  EXPECT_FALSE(res4->has_header("Content-Range"));

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, IfRangeWithDate) {
  using namespace httplib;

  // Create a test file
  const char *fname = "if_range_date_testfile.txt";
  const std::string content = "ABCDEFGHIJ0123456789"; // 20 bytes
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // First request: get Last-Modified
  auto res1 = cli.Get("/static/if_range_date_testfile.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("Last-Modified"));
  std::string last_modified = res1->get_header_value("Last-Modified");

  // Range request with matching If-Range (date): should get 206
  Headers h2 = {{"Range", "bytes=5-9"}, {"If-Range", last_modified}};
  auto res2 = cli.Get("/static/if_range_date_testfile.txt", h2);
  ASSERT_TRUE(res2);
  EXPECT_EQ(206, res2->status);
  EXPECT_EQ("FGHIJ", res2->body);

  // Range request with old If-Range date: should get 200 (full content)
  Headers h3 = {{"Range", "bytes=5-9"},
                {"If-Range", "Sun, 01 Jan 2000 00:00:00 GMT"}};
  auto res3 = cli.Get("/static/if_range_date_testfile.txt", h3);
  ASSERT_TRUE(res3);
  EXPECT_EQ(200, res3->status);
  EXPECT_EQ(content, res3->body);

  // Range request with future If-Range date: should get 206
  Headers h4 = {{"Range", "bytes=0-4"},
                {"If-Range", "Sun, 01 Jan 2099 00:00:00 GMT"}};
  auto res4 = cli.Get("/static/if_range_date_testfile.txt", h4);
  ASSERT_TRUE(res4);
  EXPECT_EQ(206, res4->status);
  EXPECT_EQ("ABCDE", res4->body);

  svr.stop();
  t.join();
  std::remove(fname);
}
TEST(ETagTest, MalformedIfNoneMatchAndWhitespace) {
  using namespace httplib;

  const char *fname = "etag_malformed.txt";
  const char *content = "malformed-etag";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // baseline: should get 200 and an ETag
  auto res1 = cli.Get("/static/etag_malformed.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("ETag"));

  // Malformed ETag value (missing quotes) should be treated as non-matching
  Headers h_bad = {{"If-None-Match", "W/noquotes"}};
  auto res_bad = cli.Get("/static/etag_malformed.txt", h_bad);
  ASSERT_TRUE(res_bad);
  EXPECT_EQ(200, res_bad->status);

  // Whitespace-only header value should be considered invalid / non-matching
  std::string raw_req = "GET /static/etag_malformed.txt HTTP/1.1\r\n"
                        "Host: localhost\r\n"
                        "If-None-Match:   \r\n"
                        "Connection: close\r\n"
                        "\r\n";

  std::string out;
  ASSERT_TRUE(send_request(5, raw_req, &out));
  EXPECT_EQ("HTTP/1.1 200 OK", out.substr(0, 15));

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, InvalidIfModifiedSinceAndIfRangeDate) {
  using namespace httplib;

  const char *fname = "ims_invalid_format.txt";
  const char *content = "ims-bad-format";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  auto res1 = cli.Get("/static/ims_invalid_format.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("Last-Modified"));

  // If-Modified-Since with invalid format should not result in 304
  Headers h_bad_date = {{"If-Modified-Since", "not-a-valid-date"}};
  auto res_bad = cli.Get("/static/ims_invalid_format.txt", h_bad_date);
  ASSERT_TRUE(res_bad);
  EXPECT_EQ(200, res_bad->status);

  // If-Range with invalid date format should be treated as mismatch -> full
  // content (200)
  Headers h_ifrange_bad = {{"Range", "bytes=0-3"},
                           {"If-Range", "invalid-date"}};
  auto res_ifrange = cli.Get("/static/ims_invalid_format.txt", h_ifrange_bad);
  ASSERT_TRUE(res_ifrange);
  EXPECT_EQ(200, res_ifrange->status);

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, IfRangeWithMalformedETag) {
  using namespace httplib;

  const char *fname = "ifrange_malformed.txt";
  const std::string content = "0123456789";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  // First request: get ETag
  auto res1 = cli.Get("/static/ifrange_malformed.txt");
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("ETag"));

  // If-Range with malformed ETag (no quotes) should be treated as mismatch ->
  // full content (200)
  Headers h_malformed = {{"Range", "bytes=0-4"}, {"If-Range", "W/noquotes"}};
  auto res2 = cli.Get("/static/ifrange_malformed.txt", h_malformed);
  ASSERT_TRUE(res2);
  EXPECT_EQ(200, res2->status);
  EXPECT_EQ(content, res2->body);

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, ExtremeLargeDateValues) {
  using namespace httplib;

  const char *fname = "ims_extreme_date.txt";
  const char *content = "ims-extreme-date";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  auto res1 = cli.Get(std::string("/static/") + fname);
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  ASSERT_TRUE(res1->has_header("Last-Modified"));

  // Extremely large year that may overflow date parsing routines.
  Headers h_large_date = {
      {"If-Modified-Since", "Sun, 01 Jan 99999 00:00:00 GMT"}};
  auto res_bad = cli.Get(std::string("/static/") + fname, h_large_date);
  ASSERT_TRUE(res_bad);
  // Expect server to treat this as invalid/mismatch and return full content
  EXPECT_EQ(200, res_bad->status);

  // If-Range with extremely large date should be treated as mismatch -> full
  // content (200)
  Headers h_ifrange_large = {{"Range", "bytes=0-3"},
                             {"If-Range", "Sun, 01 Jan 99999 00:00:00 GMT"}};
  auto res_ifrange = cli.Get(std::string("/static/") + fname, h_ifrange_large);
  ASSERT_TRUE(res_ifrange);
  EXPECT_EQ(200, res_ifrange->status);

  svr.stop();
  t.join();
  std::remove(fname);
}

TEST(ETagTest, NegativeFileModificationTime) {
  using namespace httplib;

  const char *fname = "ims_negative_mtime.txt";
  const std::string content = "negative-mtime";
  {
    std::ofstream ofs(fname);
    ofs << content;
    ASSERT_TRUE(ofs.good());
  }

  // Try to set file mtime to a negative value. This may fail on some
  // platforms/filesystems; if it fails, the test will still verify server
  // behaves safely by performing a regular conditional request.
#if defined(__APPLE__) || defined(__linux__)
  bool set_negative = false;
  do {
    struct timeval times[2];
    // access time: now
    times[0].tv_sec = time(nullptr);
    times[0].tv_usec = 0;
    // modification time: negative (e.g., -1)
    times[1].tv_sec = -1;
    times[1].tv_usec = 0;
    if (utimes(fname, times) == 0) { set_negative = true; }
  } while (0);
#else
  bool set_negative = false;
#endif

  Server svr;
  svr.set_mount_point("/static", ".");
  auto t = std::thread([&]() { svr.listen(HOST, PORT); });
  svr.wait_until_ready();

  Client cli(HOST, PORT);

  auto res1 = cli.Get(std::string("/static/") + fname);
  ASSERT_TRUE(res1);
  ASSERT_EQ(200, res1->status);
  bool has_last_modified = res1->has_header("Last-Modified");
  std::string last_modified;
  if (has_last_modified) {
    last_modified = res1->get_header_value("Last-Modified");
  }

  if (set_negative) {
    // If we successfully set a negative mtime, ensure server returns a
    // Last-Modified string (may be empty or normalized). Send If-Modified-Since
    // with an old date and ensure server handles it without crash.
    Headers h_old = {{"If-Modified-Since", "Sun, 01 Jan 1970 00:00:00 GMT"}};
    auto res2 = cli.Get(std::string("/static/") + fname, h_old);
    ASSERT_TRUE(res2);
    // Behavior may vary; at minimum ensure server responds (200 or 304).
    EXPECT_TRUE(res2->status == 200 || res2->status == 304);
  } else {
    // Could not set negative mtime on this platform; fall back to verifying
    // that normal invalid/malformed dates are treated safely (non-304).
    Headers h_bad_date = {
        {"If-Modified-Since", "Sun, 01 Jan 99999 00:00:00 GMT"}};
    auto res_bad = cli.Get(std::string("/static/") + fname, h_bad_date);
    ASSERT_TRUE(res_bad);
    EXPECT_EQ(200, res_bad->status);
  }

  svr.stop();
  t.join();
  std::remove(fname);
}

//==============================================================================
// Integration Tests with Server
//==============================================================================

class SSEIntegrationTest : public ::testing::Test {
protected:
  void SetUp() override {
    stop_server_.store(false);
    events_.clear();
    server_ = httplib::detail::make_unique<Server>();
    setup_server();
    start_server();
  }

  void TearDown() override {
    stop_server_.store(true);
    event_cv_.notify_all();
    server_->stop();
    if (server_thread_.joinable()) { server_thread_.join(); }
  }

  void setup_server() {
    // Simple SSE endpoint
    server_->Get("/events", [this](const Request &req, Response &res) {
      auto last_id = req.get_header_value("Last-Event-ID");
      if (!last_id.empty()) { last_received_event_id_ = last_id; }

      res.set_chunked_content_provider(
          "text/event-stream", [this](size_t /*offset*/, DataSink &sink) {
            std::unique_lock<std::mutex> lock(event_mutex_);
            if (event_cv_.wait_for(
                    lock, std::chrono::milliseconds(200), [this] {
                      return !events_.empty() || stop_server_.load();
                    })) {
              if (stop_server_.load()) { return false; }
              if (!events_.empty()) {
                std::string event = events_.front();
                events_.erase(events_.begin());
                sink.write(event.data(), event.size());
                return true;
              }
            }
            return !stop_server_.load();
          });
    });

    // Endpoint that returns error
    server_->Get("/error-endpoint", [](const Request &, Response &res) {
      res.status = 500;
      res.set_content("Internal Server Error", "text/plain");
    });

    // Endpoint for custom event types
    server_->Get("/custom-events", [](const Request &, Response &res) {
      res.set_chunked_content_provider(
          "text/event-stream", [](size_t offset, DataSink &sink) {
            if (offset == 0) {
              std::string event = "event: update\ndata: updated\n\n"
                                  "event: delete\ndata: deleted\n\n";
              sink.write(event.data(), event.size());
            }
            return false; // End stream after sending
          });
    });
  }

  void start_server() {
    port_ = server_->bind_to_any_port(HOST);
    server_thread_ = std::thread([this]() { server_->listen_after_bind(); });

    // Wait for server to start
    while (!server_->is_running()) {
      std::this_thread::sleep_for(std::chrono::milliseconds(10));
    }
  }

  int get_port() const { return port_; }

  void send_event(const std::string &event) {
    std::lock_guard<std::mutex> lock(event_mutex_);
    events_.push_back(event);
    event_cv_.notify_all();
  }

  std::unique_ptr<Server> server_;
  std::thread server_thread_;
  std::mutex event_mutex_;
  std::condition_variable event_cv_;
  std::vector<std::string> events_;
  std::atomic<bool> stop_server_{false};
  std::string last_received_event_id_;
  int port_ = 0;
};

//==============================================================================
// SSE Parsing Tests
//==============================================================================

class SSEParsingTest : public SSEIntegrationTest {
protected:
  // Feeds a raw event stream to SSEClient and returns the dispatched messages.
  // A trailing sentinel event tells when the whole stream has been parsed.
  std::vector<sse::SSEMessage> parse(const std::string &stream) {
    auto body = stream + "event: end\ndata: end\n\n";
    server_->Get("/parse", [body](const Request &, Response &res) {
      res.set_content(body, "text/event-stream");
    });
    return collect("/parse");
  }

  // Runs SSEClient against path until an "end" event arrives and returns the
  // messages dispatched before it
  std::vector<sse::SSEMessage> collect(const std::string &path) {
    Client client(HOST, get_port());
    sse::SSEClient sse(client, path);
    std::mutex mutex;
    std::condition_variable cv;
    std::vector<sse::SSEMessage> messages;
    auto done = false;

    sse.on_message([&](const sse::SSEMessage &msg) {
      std::lock_guard<std::mutex> lock(mutex);
      // Ignore a replay from a reconnect that races with stop()
      if (!done) { messages.push_back(msg); }
    });
    sse.on_event("end", [&](const sse::SSEMessage &) {
      std::lock_guard<std::mutex> lock(mutex);
      done = true;
      cv.notify_all();
    });
    sse.set_reconnect_interval(100);
    sse.start_async();

    {
      std::unique_lock<std::mutex> lock(mutex);
      cv.wait_for(lock, std::chrono::seconds(5), [&] { return done; });
    }
    sse.stop();

    EXPECT_TRUE(done);
    return messages;
  }
};

TEST_F(SSEParsingTest, SingleLineData) {
  auto msgs = parse("data: hello\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "hello");
  EXPECT_EQ(msgs[0].event, "message");
}

TEST_F(SSEParsingTest, MultiLineData) {
  auto msgs = parse("data: line1\ndata: line2\ndata: line3\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "line1\nline2\nline3");
}

TEST_F(SSEParsingTest, CustomEventType) {
  auto msgs = parse("event: update\ndata: payload\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].event, "update");
  EXPECT_EQ(msgs[0].data, "payload");
}

TEST_F(SSEParsingTest, EventIdHandling) {
  auto msgs = parse("id: 12345\ndata: test\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].id, "12345");
}

TEST_F(SSEParsingTest, EmptyEventId) {
  auto msgs = parse("id:\ndata: test\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].id, "");
}

TEST_F(SSEParsingTest, CommentsIgnored) {
  auto msgs = parse(": this is a comment\ndata: hello\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "hello");
  EXPECT_EQ(msgs[0].event, "message");
}

TEST_F(SSEParsingTest, ColonInValue) {
  auto msgs = parse("data: hello:world:test\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "hello:world:test");
}

TEST_F(SSEParsingTest, FieldNameOnly) {
  // A line without a colon is a field name with an empty value
  auto msgs = parse("data\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "");
}

TEST_F(SSEParsingTest, TrailingCarriageReturn) {
  auto msgs = parse("event: update\r\ndata: hello\r\n\r\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].event, "update");
  EXPECT_EQ(msgs[0].data, "hello");
}

TEST_F(SSEParsingTest, FieldNameOnlyWithCarriageReturn) {
  auto msgs = parse("data\r\n\r\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "");
}

TEST_F(SSEParsingTest, CarriageReturnLineEnding) {
  auto msgs = parse("event: update\rdata: hello\r\r");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].event, "update");
  EXPECT_EQ(msgs[0].data, "hello");
}

TEST_F(SSEParsingTest, LineEndingSplitAcrossChunks) {
  // Chunk boundaries fall inside every \r\n and right before the first one
  std::vector<std::string> chunks = {"event: update", "\r", "\ndata: hello\r",
                                     "\n\r", "\nevent: end\ndata: end\n\n"};
  server_->Get("/split", [chunks](const Request &, Response &res) {
    auto i = std::make_shared<size_t>(0);
    res.set_chunked_content_provider(
        "text/event-stream", [chunks, i](size_t /*offset*/, DataSink &sink) {
          if (*i == chunks.size()) {
            sink.done();
          } else {
            sink.write(chunks[*i].data(), chunks[*i].size());
            (*i)++;
          }
          return true;
        });
  });

  auto msgs = collect("/split");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].event, "update");
  EXPECT_EQ(msgs[0].data, "hello");
}

TEST_F(SSEParsingTest, LeadingByteOrderMarkIgnored) {
  // Only a BOM at the start of the stream is ignored
  auto msgs = parse("\xEF\xBB\xBF"
                    "data: first\n\n"
                    "\xEF\xBB\xBF"
                    "data: second\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "first");
}

TEST_F(SSEParsingTest, UnknownFieldsIgnored) {
  auto msgs = parse("unknown: value\ndata: hello\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "hello");
  EXPECT_EQ(msgs[0].event, "message");
}

TEST_F(SSEParsingTest, SpaceAfterColonOptional) {
  auto msgs = parse("data: hello\n\ndata:hello\n\n");
  ASSERT_EQ(msgs.size(), 2u);
  EXPECT_EQ(msgs[0].data, "hello");
  EXPECT_EQ(msgs[1].data, "hello");
}

TEST_F(SSEParsingTest, EventWithoutDataResetsEventType) {
  // An event without data is not dispatched, and its type must not leak
  // into the next event
  auto msgs = parse("event: update\n\ndata: hello\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].event, "message");
  EXPECT_EQ(msgs[0].data, "hello");
}

TEST_F(SSEParsingTest, EmptyEventTypeIsMessage) {
  // Also when the empty field replaces an earlier type
  auto msgs = parse("event:\ndata: a\n\nevent: update\nevent:\ndata: b\n\n");
  ASSERT_EQ(msgs.size(), 2u);
  EXPECT_EQ(msgs[0].event, "message");
  EXPECT_EQ(msgs[1].event, "message");
}

TEST_F(SSEParsingTest, EventWithoutDataUpdatesLastEventId) {
  // The first connection sends only an id; the second echoes back the
  // Last-Event-ID it was reconnected with
  std::atomic<int> connection_count{0};
  server_->Get("/id-only", [&](const Request &req, Response &res) {
    if (connection_count++ == 0) {
      res.set_content("id: 42\n\n", "text/event-stream");
    } else {
      res.set_content("data: " + req.get_header_value("Last-Event-ID") +
                          "\n\nevent: end\ndata: end\n\n",
                      "text/event-stream");
    }
  });

  auto msgs = collect("/id-only");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "42");
}

TEST_F(SSEParsingTest, EmptyEventIdClearsLastEventId) {
  // The first connection sets an id and then clears it with an empty one; the
  // second reports whether it was reconnected with a Last-Event-ID
  std::atomic<int> connection_count{0};
  server_->Get("/id-clear", [&](const Request &req, Response &res) {
    if (connection_count++ == 0) {
      res.set_content("id: 1\ndata: first\n\nid:\ndata: second\n\n",
                      "text/event-stream");
    } else {
      res.set_content(
          std::string("data: ") +
              (req.has_header("Last-Event-ID") ? "sent" : "not sent") +
              "\n\nevent: end\ndata: end\n\n",
          "text/event-stream");
    }
  });

  auto msgs = collect("/id-clear");
  ASSERT_EQ(msgs.size(), 3u);
  EXPECT_EQ(msgs[0].id, "1");
  EXPECT_EQ(msgs[1].id, "");
  EXPECT_EQ(msgs[2].data, "not sent");
}

TEST_F(SSEParsingTest, UnsendableEventIdKeepsLastEventId) {
  // The first connection sets an id and then sends ids that cannot be carried
  // in a header; the second echoes back the Last-Event-ID it was reconnected
  // with
  std::atomic<int> connection_count{0};
  server_->Get("/id-unsendable", [&](const Request &req, Response &res) {
    if (connection_count++ == 0) {
      res.set_content(std::string("id: 42\n\nid: a") + '\0' +
                          "b\n\nid: \x01\n\nid:  7\n\nid: 7 \n\n",
                      "text/event-stream");
    } else {
      res.set_content("data: " + req.get_header_value("Last-Event-ID") +
                          "\n\nevent: end\ndata: end\n\n",
                      "text/event-stream");
    }
  });

  auto msgs = collect("/id-unsendable");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].data, "42");
}

TEST_F(SSEParsingTest, CompleteEventParsing) {
  auto msgs = parse("event: notification\nid: evt-42\n"
                    "data: {\"type\":\"alert\"}\nretry: 1000\n\n");
  ASSERT_EQ(msgs.size(), 1u);
  EXPECT_EQ(msgs[0].event, "notification");
  EXPECT_EQ(msgs[0].id, "evt-42");
  EXPECT_EQ(msgs[0].data, "{\"type\":\"alert\"}");
}

TEST(SSEMessageTest, Clear) {
  sse::SSEMessage msg;
  msg.event = "custom";
  msg.data = "some data";
  msg.id = "123";

  msg.clear();

  EXPECT_EQ(msg.event, "message");
  EXPECT_EQ(msg.data, "");
  EXPECT_EQ(msg.id, "");
}

//==============================================================================
// SSE Integration Tests
//==============================================================================

// Test: Successful connection and on_open callback
TEST_F(SSEIntegrationTest, SuccessfulConnection) {
  // Add a simple endpoint that sends one event and closes
  server_->Get("/simple-event", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "data: hello\n\n";
            sink.write(event.data(), event.size());
          }
          return false; // Close stream after sending
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/simple-event");

  std::atomic<bool> open_called{false};
  std::atomic<bool> message_received{false};

  sse.on_open([&open_called]() { open_called.store(true); });

  sse.on_message([&message_received](const sse::SSEMessage &msg) {
    if (msg.data == "hello") { message_received.store(true); }
  });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(1);

  // Start async
  sse.start_async();

  // Wait for message to be processed
  std::this_thread::sleep_for(std::chrono::milliseconds(500));

  sse.stop();

  EXPECT_TRUE(open_called.load());
  EXPECT_TRUE(message_received.load());
}

TEST_F(SSEIntegrationTest, TooLongEventEndsTheConnection) {
  // A data line that never ends.
  server_->Get("/endless-line", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) { sink.write("data: ", 6); }
          std::string chunk(64 * 1024, 'A');
          return sink.write(chunk.data(), chunk.size());
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/endless-line");
  std::atomic<bool> too_long{false};
  sse.on_error([&](Error err) {
    if (err == Error::ExceedMaxPayloadSize) { too_long = true; }
  });
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  for (int i = 0; i < 500 && !too_long; i++) {
    std::this_thread::sleep_for(std::chrono::milliseconds(10));
  }
  sse.stop();
  EXPECT_TRUE(too_long);
}

TEST_F(SSEIntegrationTest, PayloadLimitDoesNotEndTheStream) {
  // Far more in all than the client's payload limit below.
  server_->Get("/many-events", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string events;
            for (int i = 0; i < 1000; i++) {
              events += "data: message\n\n";
            }
            sink.write(events.data(), events.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  client.set_payload_max_length(1024);
  sse::SSEClient sse(client, "/many-events");
  std::atomic<int> messages{0};
  std::atomic<bool> too_large{false};
  sse.on_message([&](const sse::SSEMessage &) { messages++; });
  sse.on_error([&](Error err) {
    if (err == Error::ExceedMaxPayloadSize) { too_large = true; }
  });
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  for (int i = 0; i < 500 && messages < 1000; i++) {
    std::this_thread::sleep_for(std::chrono::milliseconds(10));
  }
  sse.stop();
  EXPECT_GE(messages.load(), 1000);
  EXPECT_FALSE(too_large);
}

// Test: on_message callback
TEST_F(SSEIntegrationTest, OnMessageCallback) {
  // Endpoint that sends multiple events then closes
  server_->Get("/multi-event", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string events = "data: message1\n\ndata: message2\n\n";
            sink.write(events.data(), events.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/multi-event");

  std::vector<std::string> received_messages;
  std::mutex messages_mutex;

  sse.on_message([&](const sse::SSEMessage &msg) {
    std::lock_guard<std::mutex> lock(messages_mutex);
    received_messages.push_back(msg.data);
  });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(500));
  sse.stop();

  std::lock_guard<std::mutex> lock(messages_mutex);
  EXPECT_GE(received_messages.size(), 2u);
  if (received_messages.size() >= 2) {
    EXPECT_EQ(received_messages[0], "message1");
    EXPECT_EQ(received_messages[1], "message2");
  }
}

// Test: on_event for specific types
TEST_F(SSEIntegrationTest, OnEventForSpecificTypes) {
  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/custom-events");

  std::atomic<bool> update_received{false};
  std::atomic<bool> delete_received{false};

  sse.on_event("update", [&update_received](const sse::SSEMessage &msg) {
    if (msg.data == "updated") { update_received.store(true); }
  });

  sse.on_event("delete", [&delete_received](const sse::SSEMessage &msg) {
    if (msg.data == "deleted") { delete_received.store(true); }
  });

  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(300));
  sse.stop();

  EXPECT_TRUE(update_received.load());
  EXPECT_TRUE(delete_received.load());
}

// Test: on_error callback on connection failure
TEST_F(SSEIntegrationTest, OnErrorCallback) {
  // Connect to a non-existent port
  Client client("localhost", 59999);
  sse::SSEClient sse(client, "/events");

  std::atomic<bool> error_called{false};
  Error received_error = Error::Success;

  sse.on_error([&](Error err) {
    error_called.store(true);
    received_error = err;
  });

  sse.set_reconnect_interval(50);
  sse.set_max_reconnect_attempts(1);

  sse.start_async();
  std::this_thread::sleep_for(std::chrono::milliseconds(200));
  sse.stop();

  EXPECT_TRUE(error_called.load());
  EXPECT_NE(received_error, Error::Success);
}

// Test: Last-Event-ID header sent on reconnect
TEST_F(SSEIntegrationTest, LastEventIdHeader) {
  // Endpoint that sends event with ID
  server_->Get("/event-with-id", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "id: evt-123\ndata: test\n\n";
            sink.write(event.data(), event.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/event-with-id");

  std::atomic<bool> id_received{false};

  sse.on_message([&](const sse::SSEMessage &msg) {
    if (!msg.id.empty()) { id_received.store(true); }
  });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(500));
  sse.stop();

  EXPECT_TRUE(id_received.load());
  EXPECT_EQ(sse.last_event_id(), "evt-123");
}

// Test: last_event_id() read from another thread while start_async() runs
TEST_F(SSEIntegrationTest, LastEventIdWhileRunning) {
  // Ids of every length up to 200, so the stored id keeps changing size
  server_->Get("/many-ids", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string events;
            for (size_t i = 0; i < 2000; i++) {
              events += "id: " + std::string(1 + i % 200, 'a') + "\n";
              events += "data: x\n\n";
            }
            events += "id: end\ndata: x\n\n";
            sink.write(events.data(), events.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/many-ids");
  // Wait out the rest of the test rather than replay the stream
  sse.set_reconnect_interval(10000);
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  auto well_formed = true;
  std::string id;
  auto deadline = std::chrono::steady_clock::now() + std::chrono::seconds(5);
  while (id != "end" && std::chrono::steady_clock::now() < deadline) {
    id = sse.last_event_id();
    if (id != "end" && id.find_first_not_of('a') != std::string::npos) {
      well_formed = false;
    }
  }
  sse.stop();

  EXPECT_TRUE(well_formed);
  EXPECT_EQ(sse.last_event_id(), "end");
}

// Test: Manual stop
TEST_F(SSEIntegrationTest, ManualStop) {
  // Endpoint that sends one event and stays open briefly. The server outlives
  // this test body, so the provider uses the fixture's flag, not a local.
  server_->Get("/stay-open", [this](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [this](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "data: connected\n\n";
            sink.write(event.data(), event.size());
          }
          for (int i = 0; i < 10 && !stop_server_.load(); ++i) {
            std::this_thread::sleep_for(std::chrono::milliseconds(50));
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/stay-open");

  std::atomic<bool> connected{false};
  sse.on_open([&connected]() { connected.store(true); });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  // Wait for connection to establish
  for (int i = 0; i < 20 && !connected.load(); ++i) {
    std::this_thread::sleep_for(std::chrono::milliseconds(50));
  }
  EXPECT_TRUE(connected.load());
  EXPECT_TRUE(sse.is_connected());

  // Signal handler to stop
  stop_server_.store(true);

  // Stop SSE client
  sse.stop();
  EXPECT_FALSE(sse.is_connected());
}

// Sends one event, then nothing until stop is set
static Server::Handler idle_event_stream(std::atomic<bool> &stop) {
  return [&stop](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [&stop](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "data: hello\n\n";
            sink.write(event.data(), event.size());
          }
          while (!stop.load()) {
            std::this_thread::sleep_for(std::chrono::milliseconds(10));
          }
          return false;
        });
  };
}

// Both stop() and the destructor end a read blocked on /idle-stream promptly
static void check_stop_interrupts_blocked_read(Client &client) {
  client.set_read_timeout(30, 0);

  for (auto by_destructor : {false, true}) {
    std::atomic<bool> received{false};
    std::chrono::steady_clock::time_point start;
    {
      sse::SSEClient sse(client, "/idle-stream");
      sse.on_message([&](const sse::SSEMessage &) { received.store(true); });
      sse.start_async();

      for (int i = 0; i < 500 && !received.load(); ++i) {
        std::this_thread::sleep_for(std::chrono::milliseconds(10));
      }
      ASSERT_TRUE(received.load());
      // Let the client block in the next read
      std::this_thread::sleep_for(std::chrono::milliseconds(100));

      start = std::chrono::steady_clock::now();
      if (!by_destructor) { sse.stop(); }
    }
    EXPECT_LT(std::chrono::steady_clock::now() - start,
              std::chrono::seconds(2));
  }
}

TEST_F(SSEIntegrationTest, StopInterruptsBlockedRead) {
  server_->Get("/idle-stream", idle_event_stream(stop_server_));

  Client client("localhost", get_port());
  check_stop_interrupts_blocked_read(client);
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(SSEClientSSLTest, StopInterruptsBlockedRead) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  std::atomic<bool> done{false};
  svr.Get("/idle-stream", idle_event_stream(done));

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    done.store(true);
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Client client("https://localhost:" + std::to_string(port));
  client.enable_server_certificate_verification(false);
  check_stop_interrupts_blocked_read(client);
}
#endif

// Test: SSEClient with custom headers
TEST_F(SSEIntegrationTest, CustomHeaders) {
  // Setup a server endpoint that checks for custom header
  std::atomic<bool> header_received{false};

  server_->Get("/header-check", [&](const Request &req, Response &res) {
    if (req.get_header_value("X-Custom-Header") == "custom-value") {
      header_received.store(true);
    }
    res.set_chunked_content_provider("text/event-stream",
                                     [](size_t, DataSink &) { return false; });
  });

  Client client("localhost", get_port());
  Headers headers = {{"X-Custom-Header", "custom-value"}};
  sse::SSEClient sse(client, "/header-check", headers);

  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(200));
  sse.stop();

  EXPECT_TRUE(header_received.load());
}

// Test: Reconnect interval configuration
TEST_F(SSEIntegrationTest, ReconnectIntervalConfiguration) {
  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/events");

  auto &result = sse.set_reconnect_interval(500);
  // Builder pattern should return reference to self
  EXPECT_EQ(&result, &sse);
}

// Test: Max reconnect attempts
TEST_F(SSEIntegrationTest, MaxReconnectAttempts) {
  // Connect to non-existent port to force reconnects
  Client client("localhost", 59998);
  sse::SSEClient sse(client, "/events");

  std::atomic<int> error_count{0};

  sse.on_error([&](Error) { error_count.fetch_add(1); });

  sse.set_reconnect_interval(50);
  sse.set_max_reconnect_attempts(2);

  auto start = std::chrono::steady_clock::now();
  sse.start(); // Blocking call
  auto end = std::chrono::steady_clock::now();

  // Should have stopped after 2 failed attempts
  EXPECT_GE(error_count.load(), 2);

  // Should not have taken too long (max 2 attempts * 50ms + overhead)
  auto duration =
      std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
#ifdef _WIN32
  // Windows is much slower for socket connection failures
  EXPECT_LT(duration.count(), 7000);
#else
  EXPECT_LT(duration.count(), 1000);
#endif
}

// Test: Multi-line data in integration
TEST_F(SSEIntegrationTest, MultiLineDataIntegration) {
  // Endpoint with multi-line data
  server_->Get("/multiline-data", [](const Request &, Response &res) {
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "data: line1\ndata: line2\ndata: line3\n\n";
            sink.write(event.data(), event.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/multiline-data");

  std::string received_data;
  std::mutex data_mutex;

  sse.on_message([&](const sse::SSEMessage &msg) {
    std::lock_guard<std::mutex> lock(data_mutex);
    received_data = msg.data;
  });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(500));
  sse.stop();

  std::lock_guard<std::mutex> lock(data_mutex);
  EXPECT_EQ(received_data, "line1\nline2\nline3");
}

TEST_F(SSEIntegrationTest, EmptyDataLines) {
  server_->Get("/empty-data-lines", [](const Request &, Response &res) {
    res.set_chunked_content_provider("text/event-stream", [](size_t offset,
                                                             DataSink &sink) {
      if (offset == 0) {
        const std::string events = "data:\n\ndata:\ndata: hello\n\ndata\n\n";
        sink.write(events.data(), events.size());
      }
      return false;
    });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/empty-data-lines");
  std::mutex mutex;
  std::condition_variable cv;
  std::vector<std::string> received;

  sse.on_message([&](const sse::SSEMessage &msg) {
    std::lock_guard<std::mutex> lock(mutex);
    received.push_back(msg.data);
    cv.notify_all();
  });
  sse.set_max_reconnect_attempts(1);
  sse.start_async();

  {
    std::unique_lock<std::mutex> lock(mutex);
    cv.wait_for(lock, std::chrono::seconds(2),
                [&] { return received.size() >= 3; });
  }
  sse.stop();

  ASSERT_GE(received.size(), 3u);
  EXPECT_EQ(received[0], "");
  EXPECT_EQ(received[1], "\nhello");
  EXPECT_EQ(received[2], "");
}

// Test: Auto-reconnect after server disconnection
TEST_F(SSEIntegrationTest, AutoReconnectAfterDisconnect) {
  std::atomic<int> connection_count{0};
  std::atomic<int> message_count{0};

  // Endpoint that sends one event and closes, forcing reconnect
  server_->Get("/reconnect-test",
               [&connection_count](const Request &, Response &res) {
                 connection_count.fetch_add(1);
                 res.set_chunked_content_provider(
                     "text/event-stream", [](size_t offset, DataSink &sink) {
                       if (offset == 0) {
                         std::string event = "data: hello\n\n";
                         sink.write(event.data(), event.size());
                       }
                       return false; // Close connection after sending
                     });
               });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/reconnect-test");

  sse.on_message([&message_count](const sse::SSEMessage &) {
    message_count.fetch_add(1);
  });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(3);
  sse.start_async();

  // Wait long enough for multiple reconnects
  std::this_thread::sleep_for(std::chrono::milliseconds(800));
  sse.stop();

  // Should have connected multiple times (initial + reconnects)
  EXPECT_GE(connection_count.load(), 2);
  // Should have received messages from multiple connections
  EXPECT_GE(message_count.load(), 2);
}

TEST_F(SSEIntegrationTest, StreamEndingAtConnectionCloseIsNotAnError) {
  std::atomic<int> connection_count{0};

  // Neither Content-Length nor chunked: the close ends the stream
  server_->Get("/close-delimited",
               [&connection_count](const Request &, Response &res) {
                 connection_count.fetch_add(1);
                 res.set_content_provider(
                     "text/event-stream", [](size_t offset, DataSink &sink) {
                       if (offset == 0) {
                         std::string event = "data: hello\n\n";
                         sink.write(event.data(), event.size());
                       } else {
                         sink.done();
                       }
                       return true;
                     });
               });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/close-delimited");

  std::atomic<int> error_count{0};
  sse.on_error([&error_count](Error) { error_count.fetch_add(1); });

  sse.set_reconnect_interval(100);
  sse.start_async();

  for (int i = 0; i < 500 && connection_count.load() < 2; ++i) {
    std::this_thread::sleep_for(std::chrono::milliseconds(10));
  }
  sse.stop();

  // Reconnects as after any end of the stream, but reports no error
  EXPECT_GE(connection_count.load(), 2);
  EXPECT_EQ(0, error_count.load());
}

// Test: A retry field that is not all ASCII digits is ignored
TEST_F(SSEIntegrationTest, NonDigitRetryFieldIgnored) {
  std::atomic<int> connection_count{0};

  server_->Get("/bad-retry",
               [&connection_count](const Request &, Response &res) {
                 connection_count.fetch_add(1);
                 res.set_chunked_content_provider(
                     "text/event-stream", [](size_t offset, DataSink &sink) {
                       if (offset == 0) {
                         std::string event = "retry: -1\ndata: hello\n\n";
                         sink.write(event.data(), event.size());
                       }
                       return false;
                     });
               });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/bad-retry");

  sse.set_reconnect_interval(10000);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(500));
  sse.stop();

  EXPECT_EQ(connection_count.load(), 1);
}

// Test: A retry field of all ASCII digits sets the reconnection time
TEST_F(SSEIntegrationTest, DigitRetryFieldApplied) {
  std::mutex mutex;
  std::condition_variable cv;
  std::vector<std::chrono::steady_clock::time_point> connected_at;

  server_->Get("/zero-retry", [&](const Request &, Response &res) {
    {
      std::lock_guard<std::mutex> lock(mutex);
      connected_at.push_back(std::chrono::steady_clock::now());
      cv.notify_all();
    }
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "retry: 0\ndata: hello\n\n";
            sink.write(event.data(), event.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/zero-retry");

  sse.set_reconnect_interval(10000);
  sse.start_async();

  {
    std::unique_lock<std::mutex> lock(mutex);
    cv.wait_for(lock, std::chrono::seconds(5),
                [&] { return connected_at.size() >= 2; });
  }
  sse.stop();

  // The server-supplied interval is applied, but never below 100ms, so
  // "retry: 0" does not cause a busy reconnect loop
  std::lock_guard<std::mutex> lock(mutex);
  ASSERT_GE(connected_at.size(), 2u);
  auto interval_ms = std::chrono::duration_cast<std::chrono::milliseconds>(
                         connected_at[1] - connected_at[0])
                         .count();
  EXPECT_GE(interval_ms, 100);
}

// Test: Last-Event-ID sent on reconnect
TEST_F(SSEIntegrationTest, LastEventIdSentOnReconnect) {
  std::atomic<int> connection_count{0};
  std::vector<std::string> received_last_event_ids;
  std::mutex id_mutex;

  // Endpoint that checks Last-Event-ID header and sends event with ID
  server_->Get("/reconnect-with-id", [&](const Request &req, Response &res) {
    int conn = connection_count.fetch_add(1);

    // Capture the Last-Event-ID header from each connection
    {
      std::lock_guard<std::mutex> lock(id_mutex);
      received_last_event_ids.push_back(req.get_header_value("Last-Event-ID"));
    }

    res.set_chunked_content_provider(
        "text/event-stream", [conn](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event =
                "id: event-" + std::to_string(conn) + "\ndata: msg\n\n";
            sink.write(event.data(), event.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  sse::SSEClient sse(client, "/reconnect-with-id");

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(3);
  sse.start_async();

  // Wait for at least 2 connections
  std::this_thread::sleep_for(std::chrono::milliseconds(500));
  sse.stop();

  // Verify behavior
  std::lock_guard<std::mutex> lock(id_mutex);
  EXPECT_GE(received_last_event_ids.size(), 2u);

  // First connection should have no Last-Event-ID
  if (!received_last_event_ids.empty()) {
    EXPECT_EQ(received_last_event_ids[0], "");
  }

  // Second connection should have Last-Event-ID from first connection
  if (received_last_event_ids.size() >= 2) {
    EXPECT_EQ(received_last_event_ids[1], "event-0");
  }
}

// Test: set_headers updates headers used on reconnect
TEST_F(SSEIntegrationTest, SetHeadersUpdatesOnReconnect) {
  std::vector<std::string> received_tokens;
  std::mutex token_mutex;

  // Endpoint that captures Authorization header
  server_->Get("/auth-check", [&](const Request &req, Response &res) {
    {
      std::lock_guard<std::mutex> lock(token_mutex);
      received_tokens.push_back(req.get_header_value("Authorization"));
    }
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "data: hello\n\n";
            sink.write(event.data(), event.size());
          }
          return false; // Close connection to trigger reconnect
        });
  });

  Client client("localhost", get_port());
  Headers headers = {{"Authorization", "Bearer old-token"}};
  sse::SSEClient sse(client, "/auth-check", headers);

  // Update headers on each successful connection
  sse.on_open(
      [&sse]() { sse.set_headers({{"Authorization", "Bearer new-token"}}); });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(3);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(800));
  sse.stop();

  std::lock_guard<std::mutex> lock(token_mutex);
  ASSERT_GE(received_tokens.size(), 2u);
  // First connection uses original header
  EXPECT_EQ(received_tokens[0], "Bearer old-token");
  // Second connection uses updated header from set_headers
  EXPECT_EQ(received_tokens[1], "Bearer new-token");
}

// Test: 401 allows reconnection (so on_error can refresh headers)
TEST_F(SSEIntegrationTest, ReconnectOn401WithHeaderRefresh) {
  std::atomic<int> connection_count{0};

  // Endpoint: returns 401 on first attempt, 200 on second
  server_->Get("/auth-retry", [&](const Request &req, Response &res) {
    int conn = connection_count.fetch_add(1);
    if (conn == 0 || req.get_header_value("Authorization") != "Bearer valid") {
      res.status = StatusCode::Unauthorized_401;
      res.set_content("Unauthorized", "text/plain");
      return;
    }
    res.set_chunked_content_provider(
        "text/event-stream", [](size_t offset, DataSink &sink) {
          if (offset == 0) {
            std::string event = "data: authenticated\n\n";
            sink.write(event.data(), event.size());
          }
          return false;
        });
  });

  Client client("localhost", get_port());
  Headers headers = {{"Authorization", "Bearer expired"}};
  sse::SSEClient sse(client, "/auth-retry", headers);

  std::atomic<bool> message_received{false};

  // Refresh token on error
  sse.on_error(
      [&sse](Error) { sse.set_headers({{"Authorization", "Bearer valid"}}); });

  sse.on_message([&](const sse::SSEMessage &msg) {
    if (msg.data == "authenticated") { message_received.store(true); }
  });

  sse.set_reconnect_interval(100);
  sse.set_max_reconnect_attempts(3);
  sse.start_async();

  std::this_thread::sleep_for(std::chrono::milliseconds(800));
  sse.stop();

  // Should have reconnected after 401 and succeeded with new token
  EXPECT_GE(connection_count.load(), 2);
  EXPECT_TRUE(message_received.load());
}

TEST(Issue2318Test, EmptyHostString) {
  {
    httplib::Client cli_empty("", PORT);
    auto res = cli_empty.Get("/");
    ASSERT_FALSE(res);
    EXPECT_EQ(httplib::Error::Connection, res.error());
  }
  {
    httplib::Client cli("   ", PORT);
    auto res = cli.Get("/");
    ASSERT_FALSE(res);
    EXPECT_EQ(httplib::Error::Connection, res.error());
  }
}

#ifdef CPPHTTPLIB_ZLIB_SUPPORT
TEST(ZipBombProtectionTest, DecompressedSizeExceedsLimit) {
  Server svr;

  // Set a small payload limit (1KB)
  svr.set_payload_max_length(1024);

  svr.Post("/test", [&](const Request &req, Response &res) {
    res.set_content("Body size: " + std::to_string(req.body.size()),
                    "text/plain");
  });

  auto listen_thread = std::thread([&]() { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
  });

  svr.wait_until_ready();

  // Create data that compresses well but exceeds limit when decompressed
  // 8KB of repeated null bytes compresses to a very small size
  std::string original_data(8 * 1024, '\0');

  // Compress the data using gzip
  std::string compressed_data;
  detail::gzip_compressor compressor;
  compressor.compress(original_data.data(), original_data.size(), true,
                      [&](const char *data, size_t size) {
                        compressed_data.append(data, size);
                        return true;
                      });

  // Verify compression worked (compressed should be much smaller)
  ASSERT_LT(compressed_data.size(), original_data.size());
  ASSERT_LT(compressed_data.size(), 1024u); // Compressed fits in limit

  // Send compressed data with Content-Encoding: gzip
  Client cli(HOST, PORT);
  Headers headers = {{"Content-Encoding", "gzip"}};
  auto res =
      cli.Post("/test", headers, compressed_data, "application/octet-stream");

  // Server should reject because decompressed size (8KB) exceeds limit (1KB)
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::PayloadTooLarge_413, res->status);
}
#endif

// ============================================================================
// OpenSSL-Specific Tests
// ============================================================================

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
X509 *readCertificate(const std::string &strFileName) {
  std::ifstream inStream(strFileName);
  std::string strCertPEM((std::istreambuf_iterator<char>(inStream)),
                         std::istreambuf_iterator<char>());

  if (strCertPEM.empty()) return (nullptr);

  BIO *pbCert = BIO_new(BIO_s_mem());
  BIO_write(pbCert, strCertPEM.c_str(), (int)strCertPEM.size());
  X509 *pCert = PEM_read_bio_X509(pbCert, NULL, 0, NULL);
  BIO_free(pbCert);

  return (pCert);
}

EVP_PKEY *readPrivateKey(const std::string &strFileName) {
  std::ifstream inStream(strFileName);
  std::string strPrivateKeyPEM((std::istreambuf_iterator<char>(inStream)),
                               std::istreambuf_iterator<char>());

  if (strPrivateKeyPEM.empty()) return (nullptr);

  BIO *pbPrivKey = BIO_new(BIO_s_mem());
  BIO_write(pbPrivKey, strPrivateKeyPEM.c_str(), (int)strPrivateKeyPEM.size());
  EVP_PKEY *pPrivateKey = PEM_read_bio_PrivateKey(pbPrivKey, NULL, NULL, NULL);
  BIO_free(pbPrivKey);

  return (pPrivateKey);
}

TEST(BindServerTest, UpdateCerts) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  int port = svr.bind_to_any_port("0.0.0.0");
  ASSERT_TRUE(svr.is_valid());
  ASSERT_TRUE(port > 0);

  X509 *cert = readCertificate(SERVER_CERT_FILE);
  X509 *ca_cert = readCertificate(CLIENT_CA_CERT_FILE);
  EVP_PKEY *key = readPrivateKey(SERVER_PRIVATE_KEY_FILE);

  ASSERT_TRUE(cert != nullptr);
  ASSERT_TRUE(ca_cert != nullptr);
  ASSERT_TRUE(key != nullptr);

  X509_STORE *cert_store = X509_STORE_new();

  X509_STORE_add_cert(cert_store, ca_cert);

  // svr.update_certs(cert, key, cert_store); // deprecated
  svr.update_certs_pem(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE,
                       CLIENT_CA_CERT_FILE);

  ASSERT_TRUE(svr.is_valid());
  svr.stop();

  X509_STORE_free(cert_store);
  X509_free(cert);
  X509_free(ca_cert);
  EVP_PKEY_free(key);
}

// Test that update_certs() updates client CA list correctly
TEST(SSLClientServerTest, UpdateCertsSetsClientCAList) {
  // Start with file-based constructor
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  // Initially no client CA list should be set
  auto ssl_ctx = static_cast<SSL_CTX *>(svr.tls_context());
  ASSERT_TRUE(ssl_ctx != nullptr);

  STACK_OF(X509_NAME) *ca_list_before = SSL_CTX_get_client_CA_list(ssl_ctx);
  EXPECT_TRUE(!ca_list_before || sk_X509_NAME_num(ca_list_before) == 0);

  // Now update with client CA (PEM string)
  std::string cert_pem, key_pem, ca_pem;
  read_file(SERVER_CERT_FILE, cert_pem);
  read_file(SERVER_PRIVATE_KEY_FILE, key_pem);
  read_file(CLIENT_CA_CERT_FILE, ca_pem);

  svr.update_certs_pem(cert_pem.c_str(), key_pem.c_str(), ca_pem.c_str());

  ASSERT_TRUE(svr.is_valid());

  // Now client CA list should be set
  STACK_OF(X509_NAME) *ca_list_after = SSL_CTX_get_client_CA_list(ssl_ctx);
  ASSERT_TRUE(ca_list_after != nullptr);
  EXPECT_TRUE(sk_X509_NAME_num(ca_list_after) > 0);
}

TEST(SSLClientServerTest, FilePathConstructorSetsClientCAList) {
  // Test that the file-path SSLServer constructor properly sets the client CA
  // list that is sent to clients during the TLS handshake (CertificateRequest)
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
  ASSERT_TRUE(svr.is_valid());

  auto ssl_ctx = static_cast<SSL_CTX *>(svr.tls_context());
  ASSERT_TRUE(ssl_ctx != nullptr);

  STACK_OF(X509_NAME) *ca_list = SSL_CTX_get_client_CA_list(ssl_ctx);
  ASSERT_TRUE(ca_list != nullptr);
  EXPECT_TRUE(sk_X509_NAME_num(ca_list) > 0);
}

#endif

// ============================================================================
// MbedTLS-Specific Tests
// ============================================================================

#ifdef CPPHTTPLIB_MBEDTLS_SUPPORT
TEST(SSLClientServerTest, CustomizeServerSSLCtxMbedTLS) {
  using namespace httplib::tls;

  // Track if callback was invoked
  bool callback_invoked = false;

  // The callback receives void* ctx which is actually MbedTlsContext*
  // We can access the mbedtls_ssl_config via the context
  auto setup_callback = [&callback_invoked](void *ctx) {
    callback_invoked = true;

    // Cast to MbedTlsContext* to access the ssl config
    auto *mbedtls_ctx = static_cast<httplib::tls::impl::MbedTlsContext *>(ctx);
    mbedtls_ssl_config *conf = &mbedtls_ctx->conf;

    // Use static variables to hold certificate data (simplified for test)
    static mbedtls_x509_crt own_cert;
    static mbedtls_pk_context own_key;
    static mbedtls_x509_crt ca_chain;
    static bool initialized = false;

    if (!initialized) {
      mbedtls_x509_crt_init(&own_cert);
      mbedtls_pk_init(&own_key);
      mbedtls_x509_crt_init(&ca_chain);

      // Load server certificate
      if (mbedtls_x509_crt_parse_file(&own_cert, SERVER_CERT_FILE) != 0) {
        return false;
      }
      // Load server private key.
      // Mbed TLS 3.x takes an RNG callback here; 2.x and 4.x do not.
      if (mbedtls_pk_parse_keyfile(&own_key, SERVER_PRIVATE_KEY_FILE, nullptr
#if MBEDTLS_VERSION_MAJOR == 3
                                   ,
                                   mbedtls_ctr_drbg_random, nullptr
#endif
                                   ) != 0) {
        return false;
      }
      // Load CA chain for client verification
      if (mbedtls_x509_crt_parse_file(&ca_chain, CLIENT_CA_CERT_FILE) != 0) {
        return false;
      }
      initialized = true;
    }

    // Configure the SSL config
    mbedtls_ssl_conf_own_cert(conf, &own_cert, &own_key);
    mbedtls_ssl_conf_ca_chain(conf, &ca_chain, nullptr);
    mbedtls_ssl_conf_authmode(conf, MBEDTLS_SSL_VERIFY_REQUIRED);

    // Set minimum TLS version using mbedTLS native API
#if MBEDTLS_VERSION_MAJOR >= 3
    mbedtls_ssl_conf_min_tls_version(conf, MBEDTLS_SSL_VERSION_TLS1_2);
#else
    mbedtls_ssl_conf_min_version(conf, MBEDTLS_SSL_MAJOR_VERSION_3,
                                 MBEDTLS_SSL_MINOR_VERSION_3);
#endif

    return true;
  };

  SSLServer svr(setup_callback);
  ASSERT_TRUE(svr.is_valid());
  ASSERT_TRUE(callback_invoked);

  svr.Get("/test", [&](const Request &req, Response &res) {
    res.set_content("test", "text/plain");

    auto cert = req.peer_cert();
    ASSERT_TRUE(static_cast<bool>(cert));

    auto common_name = cert.subject_cn();
    EXPECT_EQ("Common Name", common_name);
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  SSLClient cli(HOST, PORT, CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE);
  cli.enable_server_certificate_verification(false);
  cli.set_connection_timeout(30);

  auto res = cli.Get("/test");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  ASSERT_EQ(StatusCode::OK_200, res->status);
}

// Regression test for a use-after-free where ~SSLClient freed the mbedTLS
// context (owning mbedtls_ssl_config) before shutting down a still-open
// keep-alive SSL session, which reads through that config in
// mbedtls_ssl_close_notify.
TEST(SSLClientServerTest, DestructWithLiveKeepAliveSessionMbedTLS) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());

  svr.Get("/test", [&](const Request & /*req*/, Response &res) {
    res.set_content("test", "text/plain");
  });

  thread t = thread([&]() { ASSERT_TRUE(svr.listen(HOST, PORT)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });

  svr.wait_until_ready();

  {
    SSLClient cli(HOST, PORT);
    cli.enable_server_certificate_verification(false);
    cli.set_keep_alive(true);

    auto res = cli.Get("/test");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    ASSERT_EQ(StatusCode::OK_200, res->status);
    // cli is destructed here with the keep-alive SSL session still open.
  }
}
#endif

// WebSocket Tests

TEST(WebSocketTest, RSVBitsMustBeZero) {
  // RFC 6455 Section 5.2: RSV1, RSV2, RSV3 MUST be 0 unless an extension
  // defining the meaning of these bits has been negotiated.
  auto make_frame = [](uint8_t first_byte) {
    std::string frame;
    frame += static_cast<char>(first_byte); // FIN + RSV + opcode
    frame += static_cast<char>(0x05);       // mask=0, payload_len=5
    frame += "Hello";
    return frame;
  };

  // RSV1 set (0x40)
  {
    detail::BufferStream strm;
    strm.write(make_frame(0x81 | 0x40).data(), 8); // FIN + RSV1 + Text
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // RSV2 set (0x20)
  {
    detail::BufferStream strm;
    strm.write(make_frame(0x81 | 0x20).data(), 8); // FIN + RSV2 + Text
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // RSV3 set (0x10)
  {
    detail::BufferStream strm;
    strm.write(make_frame(0x81 | 0x10).data(), 8); // FIN + RSV3 + Text
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // No RSV bits set - should succeed
  {
    detail::BufferStream strm;
    strm.write(make_frame(0x81).data(), 8); // FIN + Text, no RSV
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Ok);
    EXPECT_EQ(ws::Opcode::Text, opcode);
    EXPECT_EQ("Hello", payload);
    EXPECT_TRUE(fin);
  }
}

TEST(WebSocketTest, ControlFrameValidation) {
  // RFC 6455 Section 5.5: control frames MUST have FIN=1 and
  // payload length <= 125.

  // Ping with FIN=0 - must be rejected
  {
    detail::BufferStream strm;
    std::string frame;
    frame += static_cast<char>(0x09); // FIN=0, opcode=Ping
    frame += static_cast<char>(0x00); // mask=0, payload_len=0
    strm.write(frame.data(), frame.size());
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // Close with FIN=0 - must be rejected
  {
    detail::BufferStream strm;
    std::string frame;
    frame += static_cast<char>(0x08); // FIN=0, opcode=Close
    frame += static_cast<char>(0x00); // mask=0, payload_len=0
    strm.write(frame.data(), frame.size());
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // Ping with payload_len=126 (extended length) - must be rejected
  {
    detail::BufferStream strm;
    std::string frame;
    frame += static_cast<char>(0x89); // FIN=1, opcode=Ping
    frame += static_cast<char>(126);  // payload_len=126 (>125)
    frame += static_cast<char>(0x00); // extended length high byte
    frame += static_cast<char>(126);  // extended length low byte
    frame += std::string(126, 'x');
    strm.write(frame.data(), frame.size());
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // Ping with FIN=1 and payload_len=125 - should succeed
  {
    detail::BufferStream strm;
    std::string frame;
    frame += static_cast<char>(0x89); // FIN=1, opcode=Ping
    frame += static_cast<char>(125);  // payload_len=125
    frame += std::string(125, 'x');
    strm.write(frame.data(), frame.size());
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Ok);
    EXPECT_EQ(ws::Opcode::Ping, opcode);
    EXPECT_EQ(125u, payload.size());
    EXPECT_TRUE(fin);
  }
}

TEST(WebSocketTest, PayloadLength64BitMSBMustBeZero) {
  // RFC 6455 Section 5.2: the most significant bit of a 64-bit payload
  // length MUST be 0.

  // MSB set - must be rejected
  {
    detail::BufferStream strm;
    std::string frame;
    frame += static_cast<char>(0x81); // FIN=1, opcode=Text
    frame += static_cast<char>(127);  // 64-bit extended length
    frame += static_cast<char>(0x80); // MSB set (invalid)
    frame += std::string(7, '\0');    // remaining 7 bytes of length
    strm.write(frame.data(), frame.size());
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Fail);
  }

  // MSB clear - should pass length parsing (will be rejected by max_len,
  // but that's a different check; use a small length to verify)
  {
    detail::BufferStream strm;
    std::string frame;
    frame += static_cast<char>(0x81); // FIN=1, opcode=Text
    frame += static_cast<char>(127);  // 64-bit extended length
    frame += std::string(7, '\0');    // high bytes = 0
    frame += static_cast<char>(0x03); // length = 3
    frame += "abc";
    strm.write(frame.data(), frame.size());
    ws::Opcode opcode;
    std::string payload;
    bool fin;
    EXPECT_EQ(
        ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 1024),
        ws::impl::FrameRead::Ok);
    EXPECT_EQ(ws::Opcode::Text, opcode);
    EXPECT_EQ("abc", payload);
  }
}

TEST(WebSocketTest, InvalidUTF8TextFrame) {
  // RFC 6455 Section 5.6: text frames must contain valid UTF-8.

  // Valid UTF-8
  EXPECT_TRUE(ws::impl::is_valid_utf8("Hello"));
  EXPECT_TRUE(ws::impl::is_valid_utf8("\xC3\xA9"));         // é (U+00E9)
  EXPECT_TRUE(ws::impl::is_valid_utf8("\xE3\x81\x82"));     // あ (U+3042)
  EXPECT_TRUE(ws::impl::is_valid_utf8("\xF0\x9F\x98\x80")); // 😀 (U+1F600)
  EXPECT_TRUE(ws::impl::is_valid_utf8(""));

  // Invalid UTF-8
  EXPECT_FALSE(ws::impl::is_valid_utf8("\x80"));     // Invalid start byte
  EXPECT_FALSE(ws::impl::is_valid_utf8("\xC3\x28")); // Bad continuation
  EXPECT_FALSE(ws::impl::is_valid_utf8("\xC0\xAF")); // Overlong encoding
  EXPECT_FALSE(
      ws::impl::is_valid_utf8("\xED\xA0\x80")); // Surrogate half U+D800
  EXPECT_FALSE(ws::impl::is_valid_utf8("\xF4\x90\x80\x80")); // Beyond U+10FFFF
}

TEST(WebSocketTest, ConnectAndDisconnect) {
  Server svr;
  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws");
  auto res = client.connect();
  ASSERT_TRUE(res);
  EXPECT_EQ(Error::Success, res.error());
  EXPECT_EQ(StatusCode::SwitchingProtocol_101, res.status());
  EXPECT_TRUE(res.has_header("Sec-WebSocket-Accept"));
  EXPECT_TRUE(client.is_open());
  client.close();
  EXPECT_FALSE(client.is_open());

  svr.stop();
  t.join();
}

TEST(WebSocketTest, ValidURL) {
  ws::WebSocketClient ws1("ws://localhost:8080/path");
  EXPECT_TRUE(ws1.is_valid());

  ws::WebSocketClient ws2("ws://example.com/path");
  EXPECT_TRUE(ws2.is_valid());

  ws::WebSocketClient ws3("ws://example.com:9090/path/to/endpoint");
  EXPECT_TRUE(ws3.is_valid());

#ifdef CPPHTTPLIB_SSL_ENABLED
  ws::WebSocketClient wss1("wss://example.com/path");
  EXPECT_TRUE(wss1.is_valid());

  ws::WebSocketClient wss2("wss://example.com:443/path");
  EXPECT_TRUE(wss2.is_valid());
#endif
}

TEST(WebSocketTest, InvalidURL) {
  // No scheme
  ws::WebSocketClient ws1("localhost:8080/path");
  EXPECT_FALSE(ws1.is_valid());

  // No path
  ws::WebSocketClient ws2("ws://localhost:8080");
  EXPECT_FALSE(ws2.is_valid());

  // Empty string
  ws::WebSocketClient ws3("");
  EXPECT_FALSE(ws3.is_valid());

  // Missing host
  ws::WebSocketClient ws4("ws://:8080/path");
  EXPECT_FALSE(ws4.is_valid());

  // Port number overflow — should not crash
  ws::WebSocketClient ws5("ws://localhost:99999999999999999999/path");
  EXPECT_FALSE(ws5.is_valid());

  // Port out of range
  ws::WebSocketClient ws6("ws://localhost:99999/path");
  EXPECT_FALSE(ws6.is_valid());
}

TEST(WebSocketTest, UnsupportedScheme) {
#ifdef CPPHTTPLIB_NO_EXCEPTIONS
  ws::WebSocketClient ws1("http://localhost:8080/path");
  EXPECT_FALSE(ws1.is_valid());

  ws::WebSocketClient ws2("https://localhost:8080/path");
  EXPECT_FALSE(ws2.is_valid());

  ws::WebSocketClient ws3("ftp://localhost:8080/path");
  EXPECT_FALSE(ws3.is_valid());
#else
  EXPECT_THROW(ws::WebSocketClient("http://localhost:8080/path"),
               std::invalid_argument);

  EXPECT_THROW(ws::WebSocketClient("ftp://localhost:8080/path"),
               std::invalid_argument);
#endif
}

TEST(WebSocketTest, ConnectWhenInvalid) {
  ws::WebSocketClient ws("not a valid url");
  EXPECT_FALSE(ws.is_valid());
  auto res = ws.connect();
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::Connection, res.error());
  EXPECT_EQ(-1, res.status());
}

TEST(WebSocketTest, ConnectRefusedReportsError) {
  // Grab a port that is free, then close it again so nothing listens there
  Server svr;
  auto port = svr.bind_to_any_port(HOST);
  svr.stop();

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws");
  auto res = client.connect();
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::Connection, res.error());
  EXPECT_EQ(-1, res.status());
}

TEST(WebSocketTest, DefaultPort) {
  ws::WebSocketClient ws1("ws://example.com/path");
  EXPECT_TRUE(ws1.is_valid());
  // ws:// defaults to port 80 (verified by successful parse)

#ifdef CPPHTTPLIB_SSL_ENABLED
  ws::WebSocketClient ws2("wss://example.com/path");
  EXPECT_TRUE(ws2.is_valid());
  // wss:// defaults to port 443 (verified by successful parse)
#endif
}

TEST(WebSocketTest, IPv6LiteralAddress) {
  ws::WebSocketClient ws1("ws://[::1]:8080/path");
  EXPECT_TRUE(ws1.is_valid());

  ws::WebSocketClient ws2("ws://[fe80::1]:3000/ws");
  EXPECT_TRUE(ws2.is_valid());
}

TEST(WebSocketTest, ComplexPath) {
  ws::WebSocketClient ws1("ws://localhost:8080/path/to/endpoint");
  EXPECT_TRUE(ws1.is_valid());

  ws::WebSocketClient ws2("ws://localhost:8080/");
  EXPECT_TRUE(ws2.is_valid());
}

TEST(WebSocketTest, SpecifyServerIPAddress_AnotherHostname) {
  Server svr;
  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  auto another_host = "example.com";
  auto wrong_ip = "192.0.2.1";

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws");
  client.set_hostname_addr_map({{another_host, wrong_ip}});

  ASSERT_TRUE(client.connect());
  EXPECT_TRUE(client.is_open());
  client.close();

  svr.stop();
  t.join();
}

TEST(WebSocketTest, SpecifyServerIPAddress_RealHostname) {
  Server svr;
  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  auto wrong_ip = "192.0.2.1";

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws");
  client.set_hostname_addr_map({{"localhost", wrong_ip}});
  client.set_connection_timeout(1);
  client.set_read_timeout(1);
  client.set_write_timeout(1);

  EXPECT_FALSE(client.connect());
  EXPECT_FALSE(client.is_open());

  svr.stop();
  t.join();
}

TEST(WebSocketTest, SpecifyServerIPAddress_HostnameAsAddrMapValue) {
  // A mapped value that is not an IP literal must be resolved. HOST resolves
  // from the hosts file, so this test needs no external DNS. "target.invalid"
  // (RFC 6761) is only a map key and the Host header value.
  auto host = "target.invalid";

  Server svr;
  std::string received_host;
  svr.WebSocket("/ws", [&](const Request &req, ws::WebSocket &ws) {
    received_host = req.get_header_value("Host");
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });

  // ASSERT_* below returns from the test body, which would leave t joinable
  // and make ~thread call std::terminate.
  auto se = detail::scope_exit([&] {
    svr.stop();
    if (t.joinable()) { t.join(); }
  });

  svr.wait_until_ready();

  ws::WebSocketClient client("ws://" + std::string(host) + ":" +
                             std::to_string(port) + "/ws");
  client.set_hostname_addr_map({{host, HOST}});

  ASSERT_TRUE(client.connect());
  EXPECT_TRUE(client.is_open());
  client.close();

  svr.stop();
  t.join();

  // The mapping only redirects the connection; the identity stays host_.
  EXPECT_EQ(std::string(host) + ":" + std::to_string(port), received_host);
}

class WebSocketIntegrationTest : public ::testing::Test {
protected:
  void SetUp() override {
    server_ = httplib::detail::make_unique<Server>();
    setup_server();
    start_server();
  }

  void TearDown() override {
    server_->stop();
    if (server_thread_.joinable()) { server_thread_.join(); }
  }

  void setup_server() {
    server_->WebSocket("/ws-echo", [](const Request &, ws::WebSocket &ws) {
      std::string msg;
      ws::ReadResult ret;
      while ((ret = ws.read(msg))) {
        if (ret == ws::Binary) {
          ws.send(msg.data(), msg.size());
        } else {
          ws.send(msg);
        }
      }
    });

    server_->WebSocket("/ws-echo-string",
                       [](const Request &, ws::WebSocket &ws) {
                         std::string msg;
                         while (ws.read(msg)) {
                           ws.send("echo: " + msg);
                         }
                       });

    server_->WebSocket(
        "/ws-request-info", [](const Request &req, ws::WebSocket &ws) {
          // Echo back request metadata
          ws.send("path:" + req.path);
          ws.send("header:" + req.get_header_value("X-Test-Header"));
          std::string msg;
          while (ws.read(msg)) {}
        });

    server_->WebSocket("/ws-close", [](const Request &, ws::WebSocket &ws) {
      std::string msg;
      ws.read(msg); // wait for a message
      ws.close();
    });

    server_->WebSocket("/ws-close-status",
                       [](const Request &, ws::WebSocket &ws) {
                         std::string msg;
                         ws.read(msg); // wait for a message
                         ws.close(ws::CloseStatus::GoingAway, "shutting down");
                       });

    server_->WebSocket(
        "/ws-subprotocol",
        [](const Request &, ws::WebSocket &ws) {
          std::string msg;
          while (ws.read(msg)) {
            ws.send(msg);
          }
        },
        [](const std::vector<std::string> &protocols) -> std::string {
          for (const auto &p : protocols) {
            if (p == "graphql-ws") { return p; }
          }
          return "";
        });

    server_->WebSocket(
        "/ws-subprotocol-unoffered",
        [](const Request &, ws::WebSocket &ws) {
          std::string msg;
          while (ws.read(msg)) {
            ws.send(msg);
          }
        },
        [](const std::vector<std::string> &) -> std::string {
          return "admin";
        });
  }

  void start_server() {
    port_ = server_->bind_to_any_port(HOST);
    server_thread_ = std::thread([this]() { server_->listen_after_bind(); });
    server_->wait_until_ready();
  }

  std::unique_ptr<Server> server_;
  std::thread server_thread_;
  int port_ = 0;
};

TEST_F(WebSocketIntegrationTest, TextEcho) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.is_open());

  ASSERT_TRUE(client.send("Hello WebSocket"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("Hello WebSocket", msg);

  client.close();
}

TEST_F(WebSocketIntegrationTest, BinaryEcho) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  std::string binary_data = {'\x00', '\x01', '\x02', '\xFF', '\xFE'};
  ASSERT_TRUE(client.send(binary_data.data(), binary_data.size()));

  std::string msg;
  EXPECT_EQ(ws::Binary, client.read(msg));
  EXPECT_EQ(binary_data, msg);

  client.close();
}

TEST_F(WebSocketIntegrationTest, MultipleMessages) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  for (int i = 0; i < 10; i++) {
    auto text = "message " + std::to_string(i);
    ASSERT_TRUE(client.send(text));
    std::string msg;
    ASSERT_TRUE(client.read(msg));
    EXPECT_EQ(text, msg);
  }

  client.close();
}

TEST_F(WebSocketIntegrationTest, CloseHandshake) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-close");
  ASSERT_TRUE(client.connect());

  // Send a message to trigger the server to close
  ASSERT_TRUE(client.send("trigger close"));

  // The server will close, so read should return false
  std::string msg;
  EXPECT_FALSE(client.read(msg));
  EXPECT_FALSE(client.is_open());
}

TEST_F(WebSocketIntegrationTest, LargeMessage) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  // 128KB message
  std::string large_data(128 * 1024, 'X');
  ASSERT_TRUE(client.send(large_data));
  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ(large_data, msg);

  client.close();
}

TEST_F(WebSocketIntegrationTest, ConcurrentSend) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  const int num_threads = 4;
  std::vector<std::thread> threads;
  std::atomic<int> send_count{0};

  for (int t = 0; t < num_threads; t++) {
    threads.emplace_back([&client, &send_count, t]() {
      for (int i = 0; i < 5; i++) {
        auto text = "thread" + std::to_string(t) + "_msg" + std::to_string(i);
        if (client.send(text)) { send_count++; }
      }
    });
  }

  for (auto &th : threads) {
    th.join();
  }

  int received = 0;
  std::string msg;
  while (received < send_count.load()) {
    if (!client.read(msg)) { break; }
    received++;
  }
  EXPECT_EQ(send_count.load(), received);

  client.close();
}

TEST_F(WebSocketIntegrationTest, ReadString) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo-string");
  ASSERT_TRUE(client.connect());

  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("echo: hello", msg);

  ASSERT_TRUE(client.send("world"));
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("echo: world", msg);

  client.close();
}

TEST_F(WebSocketIntegrationTest, RequestAccess) {
  Headers headers = {{"X-Test-Header", "test-value"}};
  ws::WebSocketClient client(
      "ws://localhost:" + std::to_string(port_) + "/ws-request-info", headers);
  ASSERT_TRUE(client.connect());

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("path:/ws-request-info", msg);

  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("header:test-value", msg);

  client.close();
}

TEST_F(WebSocketIntegrationTest, ReadTimeout) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.set_read_timeout(1, 0); // 1 second
  ASSERT_TRUE(client.connect());

  // Don't send anything — server echo handler waits for a message, so read()
  // should time out. The connection survives it: nothing was consumed.
  std::string msg;
  EXPECT_EQ(client.read(msg), ws::Timeout);
  EXPECT_TRUE(client.is_open());

  // And it is still usable afterwards.
  EXPECT_TRUE(client.send("after timeout"));
  EXPECT_EQ(client.read(msg), ws::Text);
  EXPECT_EQ(msg, "after timeout");
}

TEST_F(WebSocketIntegrationTest, ReadTimeoutLeavesMessageUntouched) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.set_read_timeout(1, 0);
  ASSERT_TRUE(client.connect());

  ASSERT_TRUE(client.send("first"));
  std::string msg;
  ASSERT_EQ(client.read(msg), ws::Text);
  ASSERT_EQ(msg, "first");

  // A timeout does not write to msg. This is why `while (ws.read(msg))` must
  // not be used with a read timeout: it would reprocess the previous message.
  EXPECT_EQ(client.read(msg), ws::Timeout);
  EXPECT_EQ(msg, "first");
}

TEST_F(WebSocketIntegrationTest, ReadTimeoutSetAfterConnect) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  // Setting it once the connection is open reaches the live stream, not just
  // the seed for the next connect().
  client.set_read_timeout(1, 0);
  std::string msg;
  EXPECT_EQ(client.read(msg), ws::Timeout);
  EXPECT_TRUE(client.is_open());
}

TEST_F(WebSocketIntegrationTest, MaxPayloadExceeded) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.set_read_timeout(5, 0);
  ASSERT_TRUE(client.connect());

  // Send a message exceeding CPPHTTPLIB_WEBSOCKET_MAX_PAYLOAD_LENGTH (16MB).
  // The server should reject it and close the connection.
  std::string oversized(CPPHTTPLIB_WEBSOCKET_MAX_PAYLOAD_LENGTH + 1, 'A');
  client.send(oversized);

  // The server's read() should have failed due to payload limit,
  // so our read() should return false (connection closed).
  std::string msg;
  EXPECT_FALSE(client.read(msg));
}

TEST_F(WebSocketIntegrationTest, MaxPayloadAtLimit) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.set_read_timeout(10, 0);
  ASSERT_TRUE(client.connect());

  // Send a message exactly at CPPHTTPLIB_WEBSOCKET_MAX_PAYLOAD_LENGTH (16MB).
  // This should succeed.
  std::string at_limit(CPPHTTPLIB_WEBSOCKET_MAX_PAYLOAD_LENGTH, 'B');
  ASSERT_TRUE(client.send(at_limit));

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ(at_limit.size(), msg.size());

  client.close();
}

TEST_F(WebSocketIntegrationTest, ConnectToInvalidPath) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/nonexistent");
  auto res = client.connect();
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::WebSocketHandshake, res.error());
  EXPECT_EQ(StatusCode::NotFound_404, res.status());
  EXPECT_FALSE(client.is_open());
}

TEST_F(WebSocketIntegrationTest, EmptyMessage) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  ASSERT_TRUE(client.send(""));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("", msg);

  client.close();
}

TEST_F(WebSocketIntegrationTest, Reconnect) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");

  // First connection
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("first"));
  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("first", msg);
  client.close();
  EXPECT_FALSE(client.is_open());

  // Reconnect using the same client object
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.is_open());
  ASSERT_TRUE(client.send("second"));
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("second", msg);
  client.close();
}

TEST_F(WebSocketIntegrationTest, CloseWithStatus) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-close-status");
  ASSERT_TRUE(client.connect());

  // Trigger the server to close with GoingAway status
  ASSERT_TRUE(client.send("trigger"));

  // read() should return false after receiving the close frame
  std::string msg;
  EXPECT_FALSE(client.read(msg));
  EXPECT_FALSE(client.is_open());
}

TEST_F(WebSocketIntegrationTest, ClientCloseWithStatus) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  ASSERT_TRUE(client.connect());

  client.close(ws::CloseStatus::GoingAway, "client leaving");
  EXPECT_FALSE(client.is_open());
}

TEST_F(WebSocketIntegrationTest, SubProtocolNegotiation) {
  Headers headers = {{"Sec-WebSocket-Protocol", "mqtt, graphql-ws"}};
  ws::WebSocketClient client(
      "ws://localhost:" + std::to_string(port_) + "/ws-subprotocol", headers);
  ASSERT_TRUE(client.connect());

  // Server should have selected graphql-ws
  EXPECT_EQ("graphql-ws", client.subprotocol());

  client.close();
}

TEST_F(WebSocketIntegrationTest, SubProtocolSplitAcrossFieldLines) {
  Headers headers;
  headers.emplace("Sec-WebSocket-Protocol", "mqtt");
  headers.emplace("Sec-WebSocket-Protocol", "graphql-ws");
  ws::WebSocketClient client(
      "ws://localhost:" + std::to_string(port_) + "/ws-subprotocol", headers);
  ASSERT_TRUE(client.connect());

  // The offer on the second field line counts too, so graphql-ws is selected
  EXPECT_EQ("graphql-ws", client.subprotocol());

  client.close();
}

TEST_F(WebSocketIntegrationTest, SubProtocolNoMatch) {
  Headers headers = {{"Sec-WebSocket-Protocol", "mqtt, wamp"}};
  ws::WebSocketClient client(
      "ws://localhost:" + std::to_string(port_) + "/ws-subprotocol", headers);
  ASSERT_TRUE(client.connect());

  // Server should not have selected any subprotocol
  EXPECT_TRUE(client.subprotocol().empty());

  client.close();
}

TEST_F(WebSocketIntegrationTest, SubProtocolSelectorReturnsUnoffered) {
  Headers headers = {{"Sec-WebSocket-Protocol", "chat"}};
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                                 "/ws-subprotocol-unoffered",
                             headers);
  ASSERT_TRUE(client.connect());

  EXPECT_TRUE(client.subprotocol().empty());

  client.close();
}

TEST_F(WebSocketIntegrationTest, SubProtocolNotRequested) {
  // Connect without requesting any subprotocol
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-subprotocol");
  ASSERT_TRUE(client.connect());

  EXPECT_TRUE(client.subprotocol().empty());

  client.close();
}

TEST_F(WebSocketIntegrationTest, SocketSettings) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.set_tcp_nodelay(true);
  client.set_connection_timeout(3, 0);

  bool socket_options_called = false;
  client.set_socket_options([&](socket_t) { socket_options_called = true; });

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.is_open());
  EXPECT_TRUE(socket_options_called);

  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  auto result = client.read(msg);
  EXPECT_EQ(result, ws::ReadResult::Text);
  EXPECT_EQ(msg, "hello");

  client.close();
}

TEST_F(WebSocketIntegrationTest, ChronoTimeoutSetters) {
  ws::WebSocketClient client("ws://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.set_connection_timeout(std::chrono::seconds(3));
  client.set_write_timeout(std::chrono::seconds(3));
  // A sub-second remainder exercises the seconds/microseconds split.
  client.set_read_timeout(std::chrono::milliseconds(1500));

  ASSERT_TRUE(client.connect());

  auto start = std::chrono::steady_clock::now();
  std::string msg;
  EXPECT_EQ(client.read(msg), ws::ReadResult::Timeout);
  auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(
                     std::chrono::steady_clock::now() - start)
                     .count();
  // Above 1s so that dropping the microseconds half of the split fails here.
  // Ignoring the setter altogether would not reach this line at all: a client
  // waits forever by default.
  EXPECT_GE(elapsed, 1400);
  EXPECT_LT(elapsed, 30000);
}

#ifndef _WIN32
// A send() that times out after part of the data went out returns the count
// written so far. Every byte of the frame must still be sent, or the peer reads
// the next frame's header and payload as the rest of this one.
TEST(WebSocketPartialWriteTest, FrameIsWrittenWhole) {
  signal(SIGPIPE, SIG_IGN);

  const std::string large(4 * 1024 * 1024, 'A');
  std::atomic<bool> large_sent{false};
  std::atomic<bool> small_sent{false};

  Server svr;
  svr.set_write_timeout(0, 500000);
  svr.set_socket_options([](socket_t sock) {
    int size = 8192;
    setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
               reinterpret_cast<const char *>(&size), sizeof(size));
  });
  svr.WebSocket("/ws", [&](const Request &, ws::WebSocket &ws) {
    large_sent = ws.send(large.data(), large.size());
    small_sent = ws.send("after");
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://" + std::string(HOST) + ":" +
                             std::to_string(port) + "/ws");
  client.set_read_timeout(5);
  client.set_socket_options([](socket_t sock) {
    int size = 8192;
    setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
               reinterpret_cast<const char *>(&size), sizeof(size));
  });
  ASSERT_TRUE(client.connect());

  // Outlast the server's write timeout, then drain.
  std::this_thread::sleep_for(std::chrono::milliseconds(750));

  std::string msg;
  EXPECT_EQ(ws::ReadResult::Binary, client.read(msg));
  EXPECT_TRUE(msg == large);
  EXPECT_EQ(ws::ReadResult::Text, client.read(msg));
  EXPECT_EQ("after", msg);
  EXPECT_TRUE(large_sent);
  EXPECT_TRUE(small_sent);

  client.close();
}
#endif

TEST(WebSocketPreRoutingTest, RejectWithoutAuth) {
  Server svr;

  svr.set_pre_routing_handler([](const Request &req, Response &res) {
    if (!req.has_header("Authorization")) {
      res.status = StatusCode::Unauthorized_401;
      res.set_content("Unauthorized", "text/plain");
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });

  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {
      ws.send(msg);
    }
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  // Without Authorization header - should be rejected before upgrade
  ws::WebSocketClient client1("ws://localhost:" + std::to_string(port) + "/ws");
  EXPECT_FALSE(client1.connect());

  // The rejection is framed like any other HTTP response
  {
    Client cli("localhost", port);
    Headers headers = {{"Upgrade", "websocket"},
                       {"Connection", "Upgrade"},
                       {"Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ=="},
                       {"Sec-WebSocket-Version", "13"}};
    auto res = cli.Get("/ws", headers);
    ASSERT_TRUE(res);
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
    EXPECT_EQ("12", res->get_header_value("Content-Length"));
    EXPECT_EQ("Unauthorized", res->body);
  }

  // With Authorization header - should succeed
  Headers headers = {{"Authorization", "Bearer token123"}};
  ws::WebSocketClient client2("ws://localhost:" + std::to_string(port) + "/ws",
                              headers);
  ASSERT_TRUE(client2.connect());
  ASSERT_TRUE(client2.send("hello"));
  std::string msg;
  ASSERT_TRUE(client2.read(msg));
  EXPECT_EQ("hello", msg);
  client2.close();

  svr.stop();
  t.join();
}

TEST(WebSocketPreRoutingTest, RunsOnceForUnmatchedUpgrade) {
  Server svr;

  std::atomic<int> pre_routing_calls{0};
  std::atomic<int> pre_request_calls{0};
  svr.set_pre_routing_handler([&](const Request &req, Response &res) {
    pre_routing_calls++;
    if (req.path == "/handled") {
      res.set_content("handled", "text/plain");
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });
  svr.set_pre_request_handler([&](const Request &, Response &) {
    pre_request_calls++;
    return Server::HandlerResponse::Unhandled;
  });

  svr.Get("/http", [](const Request &, Response &res) {
    res.set_content("http", "text/plain");
  });
  svr.WebSocket("/ws",
                [](const Request &, ws::WebSocket &ws) { ws.send("ws"); });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Headers upgrade = {{"Upgrade", "websocket"},
                     {"Connection", "Upgrade"},
                     {"Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ=="},
                     {"Sec-WebSocket-Version", "13"}};

  auto get = [&](const char *path) {
    pre_routing_calls = 0;
    return Client("localhost", port).Get(path, upgrade);
  };

  // No WebSocket route, but an HTTP one
  auto res = get("/http");
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("http", res->body);
  EXPECT_EQ(1, pre_routing_calls);
  EXPECT_EQ(1, pre_request_calls);

  // No route at all
  res = get("/none");
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
  EXPECT_EQ(1, pre_routing_calls);

  // Answered by the pre-routing handler
  res = get("/handled");
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("handled", res->body);
  EXPECT_EQ(1, pre_routing_calls);

  // A WebSocket route
  pre_routing_calls = 0;
  pre_request_calls = 0;
  {
    ws::WebSocketClient client("ws://localhost:" + std::to_string(port) +
                               "/ws");
    ASSERT_TRUE(client.connect());
    std::string msg;
    ASSERT_TRUE(client.read(msg));
    EXPECT_EQ("ws", msg);
    client.close();
  }
  EXPECT_EQ(1, pre_routing_calls);
  EXPECT_EQ(1, pre_request_calls);
}

// An upgrade request answered by a hook leaves its body unread, so that body
// must not be served as the next request on the connection.
TEST(WebSocketPreRoutingTest, AnsweredUpgradeBodyIsNotNextRequest) {
  Server svr;

  svr.set_pre_routing_handler([](const Request &req, Response &res) {
    if (req.path == "/pre-routing") {
      res.set_content("pre-routing", "text/plain");
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });
  svr.set_pre_request_handler([](const Request &req, Response &res) {
    if (req.matched_route == "/pre-request") {
      res.set_content("pre-request", "text/plain");
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });

  svr.Get("/smuggled", [](const Request &, Response &res) {
    res.set_content("smuggled", "text/plain");
  });
  svr.WebSocket("/pre-request",
                [](const Request &, ws::WebSocket &ws) { ws.send("ws"); });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  const std::string body = "GET /smuggled HTTP/1.1\r\nHost: localhost\r\n\r\n";

  for (auto path : {"/pre-routing", "/pre-request"}) {
    std::string req = std::string("GET ") + path +
                      " HTTP/1.1\r\n"
                      "Host: localhost\r\n"
                      "Upgrade: websocket\r\n"
                      "Connection: Upgrade\r\n"
                      "Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n"
                      "Sec-WebSocket-Version: 13\r\n"
                      "Content-Length: " +
                      std::to_string(body.size()) + "\r\n\r\n" + body;

    std::string res;
    ASSERT_TRUE(send_request(5, req, &res, port));
    EXPECT_EQ(0u, res.find("HTTP/1.1 200 OK\r\n")) << path;
    EXPECT_NE(std::string::npos, res.find("Connection: close\r\n")) << path;
    // Only one response, and the body was not served as a request
    EXPECT_EQ(std::string::npos, res.find("HTTP/1.1", 1)) << path;
  }
}

TEST(WebSocketPreRequestTest, RejectWithoutAuth) {
  Server svr;

  std::atomic<int> pre_request_calls{0};
  std::atomic<bool> route_matched{false};
  svr.set_pre_request_handler([&](const Request &req, Response &res) {
    pre_request_calls++;
    if (req.matched_route == "/ws/:id") { route_matched = true; }
    if (req.get_header_value("Authorization") != "Bearer token123") {
      res.status = StatusCode::Unauthorized_401;
      res.set_content("Unauthorized", "text/plain");
      return Server::HandlerResponse::Handled;
    }
    return Server::HandlerResponse::Unhandled;
  });

  std::atomic<bool> handler_called{false};
  svr.WebSocket("/ws/:id", [&](const Request &req, ws::WebSocket &ws) {
    handler_called = true;
    ws.send(req.matched_route + " " + req.path_params.at("id"));
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  // Without Authorization header - should be rejected before upgrade
  ws::WebSocketClient client1("ws://localhost:" + std::to_string(port) +
                              "/ws/1");
  EXPECT_FALSE(client1.connect());
  EXPECT_FALSE(handler_called);
  EXPECT_EQ(1, pre_request_calls);
  EXPECT_TRUE(route_matched);

  // The rejection is an ordinary HTTP response, not a protocol switch
  {
    Client cli("localhost", port);
    Headers headers = {{"Upgrade", "websocket"},
                       {"Connection", "Upgrade"},
                       {"Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ=="},
                       {"Sec-WebSocket-Version", "13"}};
    auto res = cli.Get("/ws/1", headers);
    ASSERT_TRUE(res);
    EXPECT_EQ(StatusCode::Unauthorized_401, res->status);
    EXPECT_EQ("12", res->get_header_value("Content-Length"));
    EXPECT_EQ("Unauthorized", res->body);
  }
  EXPECT_FALSE(handler_called);

  // With Authorization header - should succeed
  Headers headers = {{"Authorization", "Bearer token123"}};
  ws::WebSocketClient client2(
      "ws://localhost:" + std::to_string(port) + "/ws/2", headers);
  ASSERT_TRUE(client2.connect());
  std::string msg;
  ASSERT_TRUE(client2.read(msg));
  EXPECT_EQ("/ws/:id 2", msg);
  EXPECT_TRUE(handler_called);
  client2.close();

  svr.stop();
  t.join();
}

#ifndef CPPHTTPLIB_NO_EXCEPTIONS
static Headers websocket_upgrade_headers() {
  return {{"Upgrade", "websocket"},
          {"Connection", "Upgrade"},
          {"Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ=="},
          {"Sec-WebSocket-Version", "13"},
          {"Sec-WebSocket-Protocol", "chat"}};
}

TEST(WebSocketExceptionTest, HooksBeforeUpgradeReachExceptionHandler) {
  Server svr;
  svr.set_pre_routing_handler([](const Request &req, Response &) {
    if (req.path == "/pre-routing") { throw std::runtime_error(req.path); }
    return Server::HandlerResponse::Unhandled;
  });
  svr.set_pre_request_handler([](const Request &req, Response &) {
    if (req.path == "/pre-request") { throw std::runtime_error(req.path); }
    return Server::HandlerResponse::Unhandled;
  });
  svr.set_exception_handler(
      [](const Request &, Response &res, std::exception_ptr ep) {
        try {
          std::rethrow_exception(ep);
        } catch (std::exception &e) { res.set_content(e.what(), "text/plain"); }
      });

  auto handler = [](const Request &, ws::WebSocket &) {};
  svr.WebSocket("/pre-routing", handler);
  svr.WebSocket("/pre-request", handler);
  svr.WebSocket("/sub-protocol", handler,
                [](const std::vector<std::string> &) -> std::string {
                  throw std::runtime_error("/sub-protocol");
                });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  for (auto path : {"/pre-routing", "/pre-request", "/sub-protocol"}) {
    auto res = cli.Get(path, websocket_upgrade_headers());
    if (!res) {
      ADD_FAILURE() << path << ": " << to_string(res.error());
      continue;
    }
    EXPECT_EQ(StatusCode::InternalServerError_500, res->status) << path;
    EXPECT_EQ(path, res->body);
  }
}

TEST(WebSocketExceptionTest, HookBeforeUpgradeWithoutExceptionHandler) {
  Server svr;
  svr.set_pre_routing_handler(
      [](const Request &, Response &) -> Server::HandlerResponse {
        throw std::runtime_error("pre-routing");
      });
  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &) {});

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  Client cli(HOST, port);
  auto res = cli.Get("/ws", websocket_upgrade_headers());
  ASSERT_TRUE(res) << to_string(res.error());
  EXPECT_EQ(StatusCode::InternalServerError_500, res->status);
}
#endif

TEST(WebSocketServerTimeoutTest, HandlerSendsWhileNothingArrives) {
  Server svr;

  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &ws) {
    // A read timeout is how a handler gets control back. Without it, a handler
    // parked in read() can never write on the connection it is reading.
    ws.set_read_timeout(std::chrono::milliseconds(100));
    std::string msg;
    while (ws.is_open()) {
      auto r = ws.read(msg);
      if (r == httplib::ws::Timeout) {
        ws.send("tick");
        continue;
      }
      if (r == httplib::ws::Fail) { break; }
      ws.send(msg);
    }
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws");
  client.set_read_timeout(10, 0); // fail rather than hang if no tick arrives
  ASSERT_TRUE(client.connect());

  // The client sends nothing, so anything it receives came out of the
  // handler's timeout path.
  std::string msg;
  ASSERT_EQ(client.read(msg), ws::Text);
  EXPECT_EQ("tick", msg);

  client.close();
  svr.stop();
  t.join();
}

// Stream::read may return fewer bytes than asked for. This is that contract at
// its worst -- one byte per call -- which is what a frame header straddling a
// read buffer's boundary looks like to the frame parser.
class WsByteAtATimeStream : public Stream {
public:
  explicit WsByteAtATimeStream(std::string data) : data_(std::move(data)) {}
  bool is_readable() const override { return true; }
  bool wait_readable() const override { return true; }
  bool wait_writable() const override { return true; }
  ssize_t read(char *ptr, size_t size) override {
    if (size == 0 || pos_ >= data_.size()) { return 0; }
    *ptr = data_[pos_++];
    return 1;
  }
  ssize_t write(const char *, size_t size) override {
    return static_cast<ssize_t>(size);
  }
  void get_remote_ip_and_port(std::string &ip, int &port) const override {
    ip = "127.0.0.1";
    port = 0;
  }
  void get_local_ip_and_port(std::string &ip, int &port) const override {
    ip = "127.0.0.1";
    port = 0;
  }
  socket_t socket() const override { return INVALID_SOCKET; }
  time_t duration() const override { return 0; }

private:
  std::string data_;
  size_t pos_ = 0;
};

TEST(WebSocketFrameTest, MultiByteFieldsSplitAcrossReads) {
  // The payload uses the 16-bit extended length, so the header, the length
  // and the mask key are all multi-byte fields here. Each used to be read
  // with a single read() call, which fails as soon as one is split. The
  // payload is also a little over one read chunk, so it is read in two.
  std::string body;
  for (size_t i = 0; i < CPPHTTPLIB_RECV_BUFSIZ + 3; i++) {
    body += static_cast<char>(i % 251);
  }
  const uint8_t mask[4] = {0x0a, 0x0b, 0x0c, 0x0d};

  std::string frame;
  frame += static_cast<char>(0x81);       // FIN + Text
  frame += static_cast<char>(0x80 | 126); // masked, 16-bit length follows
  frame += static_cast<char>(body.size() >> 8);
  frame += static_cast<char>(body.size() & 0xff);
  for (size_t i = 0; i < 4; i++) {
    frame += static_cast<char>(mask[i]);
  }
  for (size_t i = 0; i < body.size(); i++) {
    frame += static_cast<char>(body[i] ^ mask[i % 4]);
  }

  WsByteAtATimeStream strm(frame);
  ws::Opcode opcode;
  std::string payload;
  bool fin = false;
  ASSERT_EQ(ws::impl::read_websocket_frame(strm, opcode, payload, fin,
                                           /*expect_masked=*/true, body.size()),
            ws::impl::FrameRead::Ok);
  EXPECT_TRUE(fin);
  EXPECT_EQ(opcode, ws::Opcode::Text);
  EXPECT_EQ(payload, body);
}

TEST(WebSocketFrameTest, ZeroMaxLenMeansNoLimit) {
  std::string body(2000, 'x');
  std::string frame;
  frame += static_cast<char>(0x82); // FIN + Binary
  frame += static_cast<char>(126);  // 16-bit length follows
  frame += static_cast<char>(body.size() >> 8);
  frame += static_cast<char>(body.size() & 0xff);
  frame += body;

  detail::BufferStream strm;
  strm.write(frame.data(), frame.size());
  ws::Opcode opcode;
  std::string payload;
  bool fin;
  EXPECT_EQ(
      ws::impl::read_websocket_frame(strm, opcode, payload, fin, false, 0),
      ws::impl::FrameRead::Ok);
  EXPECT_EQ(body, payload);
}

TEST(WebSocketFrameTest, PayloadGrowsOnlyAsItArrives) {
  // The header announces the largest payload allowed, and only 3 bytes of it
  // ever arrive.
  uint64_t len = CPPHTTPLIB_WEBSOCKET_MAX_PAYLOAD_LENGTH;
  std::string frame;
  frame += static_cast<char>(0x82); // FIN + Binary
  frame += static_cast<char>(127);  // 64-bit length follows
  for (int shift = 56; shift >= 0; shift -= 8) {
    frame += static_cast<char>((len >> shift) & 0xff);
  }
  frame += "abc";

  detail::BufferStream strm;
  strm.write(frame.data(), frame.size());
  ws::Opcode opcode;
  std::string payload;
  bool fin;
  EXPECT_EQ(
      ws::impl::read_websocket_frame(strm, opcode, payload, fin, false,
                                     CPPHTTPLIB_WEBSOCKET_MAX_PAYLOAD_LENGTH),
      ws::impl::FrameRead::Fail);
  EXPECT_LT(payload.capacity(), 2 * CPPHTTPLIB_RECV_BUFSIZ);
}

TEST(WebSocketTest, QueryStringInHandshake) {
  Server svr;

  std::mutex mtx;
  std::string received_target;
  std::string received_token;

  svr.WebSocket("/ws", [&](const Request &req, ws::WebSocket &ws) {
    {
      std::lock_guard<std::mutex> lock(mtx);
      received_target = req.target;
      if (req.has_param("token")) {
        received_token = req.get_param_value("token");
      }
    }
    std::string msg;
    while (ws.read(msg)) {
      ws.send(msg);
    }
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) +
                             "/ws?token=ABC&session=123");
  ASSERT_TRUE(client.connect());
  // Round-trip ensures the handler has run and captured the request.
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();

  {
    std::lock_guard<std::mutex> lock(mtx);
    EXPECT_EQ("/ws?token=ABC&session=123", received_target);
    EXPECT_EQ("ABC", received_token);
  }

  svr.stop();
  t.join();
}

// Run a handshake against a throwaway server and hand the request the server
// received back to the caller, so tests can assert on the headers the client
// actually put on the wire.
static void capture_websocket_handshake_request(
    const Headers &client_headers,
    std::function<void(const Request &, int port)> verify) {
  Server svr;

  std::mutex mtx;
  Request received;

  svr.WebSocket("/ws", [&](const Request &req, ws::WebSocket &ws) {
    {
      std::lock_guard<std::mutex> lock(mtx);
      received = req;
    }
    std::string msg;
    while (ws.read(msg)) {
      ws.send(msg);
    }
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws",
                             client_headers);
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  ASSERT_TRUE(client.read(msg));
  client.close();

  {
    std::lock_guard<std::mutex> lock(mtx);
    verify(received, port);
  }
}

TEST(WebSocketTest, DefaultHeadersInHandshake) {
  capture_websocket_handshake_request({}, [](const Request &req, int port) {
    // Non-default port must be present in the Host header. Default ports
    // (80/443) are omitted; that logic is covered by
    // MakeHostAndPortStringTest.
    EXPECT_EQ("localhost:" + std::to_string(port),
              req.get_header_value("Host"));
    EXPECT_EQ(std::string("cpp-httplib/") + CPPHTTPLIB_VERSION,
              req.get_header_value("User-Agent"));
    EXPECT_FALSE(req.has_header("Accept"));
    EXPECT_FALSE(req.has_header("Accept-Encoding"));
    EXPECT_FALSE(req.has_header("Content-Length"));
  });
}

TEST(WebSocketTest, UserHeadersOverrideGeneratedOnesInHandshake) {
  capture_websocket_handshake_request(
      {{"Host", "example.com"},
       {"User-Agent", "custom-agent"},
       {"X-Custom", "value"}},
      [](const Request &req, int) {
        EXPECT_EQ("example.com", req.get_header_value("Host"));
        EXPECT_EQ(1U, req.get_header_value_count("Host"));
        EXPECT_EQ("custom-agent", req.get_header_value("User-Agent"));
        EXPECT_EQ(1U, req.get_header_value_count("User-Agent"));
        EXPECT_EQ("value", req.get_header_value("X-Custom"));
      });
}

TEST(WebSocketTest, MandatoryHeadersInHandshakeAreEnforced) {
  capture_websocket_handshake_request(
      {{"Upgrade", "bogus"},
       {"Connection", "close"},
       {"Sec-WebSocket-Key", "AAAAAAAAAAAAAAAAAAAAAA=="},
       {"Sec-WebSocket-Version", "8"}},
      [](const Request &req, int) {
        EXPECT_EQ("websocket", req.get_header_value("Upgrade"));
        EXPECT_EQ(1U, req.get_header_value_count("Upgrade"));
        EXPECT_EQ("Upgrade", req.get_header_value("Connection"));
        EXPECT_EQ(1U, req.get_header_value_count("Connection"));
        EXPECT_EQ("13", req.get_header_value("Sec-WebSocket-Version"));
        EXPECT_EQ(1U, req.get_header_value_count("Sec-WebSocket-Version"));
        EXPECT_EQ(1U, req.get_header_value_count("Sec-WebSocket-Key"));
        EXPECT_NE("AAAAAAAAAAAAAAAAAAAAAA==",
                  req.get_header_value("Sec-WebSocket-Key"));
      });
}

TEST(WebSocketTest, InvalidHeaderInHandshakeWritesNothing) {
  // A header the client refuses to send must abort the handshake before any
  // part of it reaches the wire; a lone request line would otherwise sit in
  // the peer's buffer as a truncated request.
  auto srv = ::socket(AF_INET, SOCK_STREAM, 0);
  ASSERT_NE(INVALID_SOCKET, srv);
  auto se_srv = detail::scope_exit([&] { detail::close_socket(srv); });

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = 0; // ephemeral, so parallel shards don't collide
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
  ASSERT_EQ(0, ::bind(srv, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)));
  ASSERT_EQ(0, ::listen(srv, 1));

  sockaddr_in bound{};
  socklen_t bound_len = sizeof(bound);
  ASSERT_EQ(
      0, ::getsockname(srv, reinterpret_cast<sockaddr *>(&bound), &bound_len));
  auto port = ntohs(bound.sin_port);

  ssize_t received = -1;
  std::thread t([&] {
    // Bound every blocking call so a regression fails the test with a bad
    // value instead of hanging the suite.
    fd_set rfds;
    FD_ZERO(&rfds);
    FD_SET(srv, &rfds);
    timeval tv{5, 0};
    if (::select(static_cast<int>(srv + 1), &rfds, nullptr, nullptr, &tv) <=
        0) {
      return;
    }

    sockaddr_in cli_addr{};
    socklen_t cli_len = sizeof(cli_addr);
    auto cli = ::accept(srv, reinterpret_cast<sockaddr *>(&cli_addr), &cli_len);
    if (cli == INVALID_SOCKET) { return; }
    auto se_cli = detail::scope_exit([&] { detail::close_socket(cli); });

    detail::set_socket_opt_time(cli, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    char buf[4096];
    received = ::recv(cli, buf, sizeof(buf), 0);
  });
  // The CR/LF makes the value invalid, so check_and_write_headers rejects it.
  // connect() has already shut the socket down by the time it returns false,
  // so the peer sees EOF without waiting for the client to be destroyed.
  ws::WebSocketClient client("ws://127.0.0.1:" + std::to_string(port) + "/ws",
                             {{"X-Bad", "a\r\nInjected: 1"}});
  EXPECT_FALSE(client.connect());

  t.join();

  // 0 means the peer saw a clean EOF without a single byte of the handshake.
  EXPECT_EQ(0, received);
}

TEST(WebSocketTest, ConnectionHeaderNeedsCompleteUpgradeToken) {
  // RFC 6455 4.2.1: Connection is a token list, so a value that merely
  // contains "upgrade" as a substring is a different token and must not
  // start a WebSocket handshake.
  auto make_request = [](const std::vector<std::string> &connection_values) {
    Request req;
    req.method = "GET";
    req.headers.emplace("Upgrade", "websocket");
    for (const auto &value : connection_values) {
      req.headers.emplace("Connection", value);
    }
    req.headers.emplace("Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ==");
    req.headers.emplace("Sec-WebSocket-Version", "13");
    return req;
  };

  EXPECT_TRUE(detail::is_websocket_upgrade(make_request({"Upgrade"})));
  EXPECT_TRUE(detail::is_websocket_upgrade(make_request({"upgrade"})));
  EXPECT_TRUE(
      detail::is_websocket_upgrade(make_request({"keep-alive, Upgrade"})));
  EXPECT_TRUE(
      detail::is_websocket_upgrade(make_request({"Upgrade , keep-alive"})));
  EXPECT_TRUE(
      detail::is_websocket_upgrade(make_request({"keep-alive", "Upgrade"})));

  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"notupgrade"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"upgrade-not"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"xupgrade"})));
  EXPECT_FALSE(
      detail::is_websocket_upgrade(make_request({"keep-alive, notupgrade"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"close"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({})));
}

TEST(WebSocketTest, UpgradeHeaderNeedsCompleteWebsocketToken) {
  // RFC 9110 7.8 defines Upgrade as a comma-separated list of protocols and
  // asks recipients to match each protocol-name case-insensitively, and RFC
  // 6455 4.2.1 asks for a header field containing the value "websocket". A
  // client naming websocket alongside another protocol, or on a second field
  // line, is offering websocket; a value that merely contains "websocket" as a
  // substring is a different protocol name and is not.
  auto make_request = [](const std::vector<std::string> &upgrade_values) {
    Request req;
    req.method = "GET";
    for (const auto &value : upgrade_values) {
      req.headers.emplace("Upgrade", value);
    }
    req.headers.emplace("Connection", "Upgrade");
    req.headers.emplace("Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ==");
    req.headers.emplace("Sec-WebSocket-Version", "13");
    return req;
  };

  EXPECT_TRUE(detail::is_websocket_upgrade(make_request({"websocket"})));
  EXPECT_TRUE(detail::is_websocket_upgrade(make_request({"WebSocket"})));
  EXPECT_TRUE(
      detail::is_websocket_upgrade(make_request({"websocket, HTTP/3.0"})));
  EXPECT_TRUE(
      detail::is_websocket_upgrade(make_request({"HTTP/3.0 , websocket"})));
  EXPECT_TRUE(
      detail::is_websocket_upgrade(make_request({"HTTP/3.0", "websocket"})));

  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"notwebsocket"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"websocket-2"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"xwebsocket"})));
  EXPECT_FALSE(
      detail::is_websocket_upgrade(make_request({"HTTP/3.0, notwebsocket"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({"h2c"})));
  EXPECT_FALSE(detail::is_websocket_upgrade(make_request({})));
}

TEST(WebSocketTest, ServerRejectsHandshakeWithoutUpgradeToken) {
  Server svr;
  svr.WebSocket("/ws", [](const Request &, ws::WebSocket &) {});

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  Headers headers = {{"Upgrade", "websocket"},
                     {"Connection", "notupgrade"},
                     {"Sec-WebSocket-Key", "dGhlIHNhbXBsZSBub25jZQ=="},
                     {"Sec-WebSocket-Version", "13"}};

  Client cli("localhost", port);
  auto res = cli.Get("/ws", headers);

  // The route exists only as a WebSocket route, so a request that fails the
  // handshake check falls through to ordinary routing.
  ASSERT_TRUE(res);
  EXPECT_EQ(StatusCode::NotFound_404, res->status);
}

TEST(WebSocketTest, ClientRejectsResponseWithoutUpgradeToken) {
  // The peer answers 101 with a correct Sec-WebSocket-Accept, so the
  // Connection value is the only thing left for the client to reject.
  Server svr;
  svr.Get("/ws", [](const Request &req, Response &res) {
    res.status = StatusCode::SwitchingProtocol_101;
    res.set_header("Upgrade", "websocket");
    res.set_header("Connection", "notupgrade");
    res.set_header("Sec-WebSocket-Accept",
                   detail::websocket_accept_key(
                       req.get_header_value("Sec-WebSocket-Key")));
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://localhost:" + std::to_string(port) + "/ws");

  auto res = client.connect();
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::WebSocketHandshake, res.error());
  EXPECT_FALSE(client.is_open());
}

TEST(WebSocketTest, ClientRejectsUnofferedSubprotocol) {
  Server svr;
  svr.Get("/ws", [](const Request &req, Response &res) {
    res.status = StatusCode::SwitchingProtocol_101;
    res.set_header("Upgrade", "websocket");
    res.set_header("Connection", "Upgrade");
    res.set_header("Sec-WebSocket-Accept",
                   detail::websocket_accept_key(
                       req.get_header_value("Sec-WebSocket-Key")));
    res.set_header("Sec-WebSocket-Protocol", "admin");
  });

  auto port = svr.bind_to_any_port("localhost");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  const auto url = "ws://localhost:" + std::to_string(port) + "/ws";

  // Server selects a subprotocol the client never offered
  {
    Headers headers = {{"Sec-WebSocket-Protocol", "chat"}};
    ws::WebSocketClient client(url, headers);

    auto res = client.connect();
    EXPECT_FALSE(res);
    EXPECT_EQ(Error::WebSocketHandshake, res.error());
    EXPECT_FALSE(client.is_open());
    EXPECT_TRUE(client.subprotocol().empty());
  }

  // Client offered none but the server named one anyway
  {
    ws::WebSocketClient client(url);

    auto res = client.connect();
    EXPECT_FALSE(res);
    EXPECT_EQ(Error::WebSocketHandshake, res.error());
    EXPECT_FALSE(client.is_open());
    EXPECT_TRUE(client.subprotocol().empty());
  }
}

TEST(WebSocketTest, HostHeaderOverUnixSocket) {
  // The socket path doubles as the URL host, so it must not contain '/'.
  const char *shard = getenv("GTEST_SHARD_INDEX");
  const std::string sock_path =
      shard ? std::string("httplib-ws-") + shard + ".sock"
            : std::string("httplib-ws.sock");
  std::remove(sock_path.c_str());

  Server svr;

  std::mutex mtx;
  std::string received_host;

  svr.WebSocket("/ws", [&](const Request &req, ws::WebSocket &ws) {
    {
      std::lock_guard<std::mutex> lock(mtx);
      received_host = req.get_header_value("Host");
    }
    std::string msg;
    while (ws.read(msg)) {
      ws.send(msg);
    }
  });
  svr.set_address_family(AF_UNIX);

  std::thread t([&]() { ASSERT_TRUE(svr.listen(sock_path, 80)); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    std::remove(sock_path.c_str());
  });
  svr.wait_until_ready();

  ws::WebSocketClient client("ws://" + sock_path + "/ws");
  client.set_address_family(AF_UNIX);
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  ASSERT_TRUE(client.read(msg));
  client.close();

  {
    std::lock_guard<std::mutex> lock(mtx);
    // There is no host:port for a Unix socket, so the same "localhost"
    // placeholder the HTTP client uses is expected.
    EXPECT_EQ("localhost", received_host);
  }
}

// Two threads must never parse WebSocket frames from the same stream.
// close() used to read the peer's Close reply with its own frame read, so it
// raced a reader thread that was in the middle of a payload: the payload loop
// in read_websocket_frame() keeps reading until payload_len bytes are in hand,
// so bytes taken by close() were replaced with bytes from further along the
// stream. The message kept its length and silently changed content.
//
// The raw peer below sends a frame header plus part of the payload, waits for
// the handler to call close(), and only then sends the rest. Whichever thread
// would win the race for those bytes, the message must arrive intact, because
// close() must not touch the stream while read() owns it.
TEST(WebSocketTest, CloseDoesNotStealBytesFromConcurrentRead) {
#ifndef _WIN32
  signal(SIGPIPE, SIG_IGN);
#endif

  const size_t payload_len = 120; // fits the 7-bit length field
  const size_t prefix_len = 8;
  const int attempts = 8;

  std::string expected(payload_len, '\0');
  for (size_t i = 0; i < payload_len; i++) {
    expected[i] = static_cast<char>('a' + i % 26);
  }

  std::atomic<bool> peer_stalled{false};
  std::atomic<bool> handler_done{false};
  std::mutex received_mutex;
  std::vector<std::string> received;

  // Bound every wait, so a regression fails the test instead of hanging the
  // suite.
  auto wait_for = [](const std::atomic<bool> &flag) {
    for (int i = 0; i < 500 && !flag; i++) {
      std::this_thread::sleep_for(std::chrono::milliseconds(10));
    }
  };

  Server svr;
  svr.set_websocket_ping_interval(0);
  svr.WebSocket("/ws", [&](const Request &, ws::WebSocket &ws) {
    std::thread reader([&]() {
      std::string msg;
      while (ws.read(msg)) {
        std::lock_guard<std::mutex> guard(received_mutex);
        received.push_back(msg);
      }
    });

    // Wait until the peer stalls mid-payload, so the reader thread is parked
    // inside read_websocket_frame() when close() runs.
    wait_for(peer_stalled);
    ws.close();
    reader.join();
    handler_done = true;
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto send_bytes = [](socket_t s, const std::string &data) {
#ifdef _WIN32
    auto n = ::send(s, data.data(), static_cast<int>(data.size()), 0);
#else
    auto n = ::send(s, data.data(), data.size(), 0);
#endif
    return n == static_cast<decltype(n)>(data.size());
  };

  // Frame header with an all-zero mask key, so the payload goes out verbatim.
  // Every length used here fits the 7-bit length field.
  auto masked_header = [](uint8_t first_byte, size_t len) {
    std::string h;
    h += static_cast<char>(first_byte);
    h += static_cast<char>(0x80 | len); // masked, 7-bit length
    h.append(4, '\0');                  // mask key
    return h;
  };

  for (int attempt = 0; attempt < attempts; attempt++) {
    peer_stalled = false;
    handler_done = false;

    auto sock = ::socket(AF_INET, SOCK_STREAM, 0);
    ASSERT_NE(INVALID_SOCKET, sock) << "attempt " << attempt;
    auto se_sock = detail::scope_exit([&] {
      if (sock != INVALID_SOCKET) { detail::close_socket(sock); }
    });
    detail::set_socket_opt_time(sock, SOL_SOCKET, SO_RCVTIMEO, 5, 0);
    detail::set_socket_opt_time(sock, SOL_SOCKET, SO_SNDTIMEO, 5, 0);

    sockaddr_in addr{};
    addr.sin_family = AF_INET;
    addr.sin_port = htons(static_cast<uint16_t>(port));
    ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
    ASSERT_EQ(
        0, ::connect(sock, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)))
        << "attempt " << attempt;

    ASSERT_TRUE(send_bytes(sock,
                           "GET /ws HTTP/1.1\r\n"
                           "Host: 127.0.0.1\r\n"
                           "Upgrade: websocket\r\n"
                           "Connection: Upgrade\r\n"
                           "Sec-WebSocket-Key: AAAAAAAAAAAAAAAAAAAAAA==\r\n"
                           "Sec-WebSocket-Version: 13\r\n"
                           "\r\n"))
        << "attempt " << attempt;

    std::string response;
    while (response.find("\r\n\r\n") == std::string::npos) {
      char buf[512];
      auto n = ::recv(sock, buf, static_cast<int>(sizeof(buf)), 0);
      if (n <= 0) { break; }
      response.append(buf, static_cast<size_t>(n));
    }
    ASSERT_NE(std::string::npos, response.find(" 101 "))
        << "attempt " << attempt;

    // Send the header of a Binary message but only the first prefix_len bytes
    // of its payload, leaving the reader thread stalled inside the payload.
    ASSERT_TRUE(send_bytes(sock, masked_header(0x82, payload_len) +
                                     expected.substr(0, prefix_len)))
        << "attempt " << attempt;

    std::this_thread::sleep_for(std::chrono::milliseconds(50));
    peer_stalled = true;
    // Let close() send its Close frame and park in its own read before the
    // rest of the payload arrives, so both threads are waiting for it.
    std::this_thread::sleep_for(std::chrono::milliseconds(50));

    std::string close_frame = masked_header(0x88, 2); // FIN + Close
    close_frame += static_cast<char>(0x03);           // status 1000
    close_frame += static_cast<char>(0xE8);
    ASSERT_TRUE(send_bytes(sock, expected.substr(prefix_len) + close_frame))
        << "attempt " << attempt;

    // Closing the peer releases the reader thread even on the buggy path,
    // where it waits for bytes another thread already consumed.
    std::this_thread::sleep_for(std::chrono::milliseconds(50));
    detail::close_socket(sock);
    sock = INVALID_SOCKET;

    wait_for(handler_done);
    ASSERT_TRUE(handler_done) << "attempt " << attempt;
  }

  std::lock_guard<std::mutex> guard(received_mutex);
  EXPECT_EQ(static_cast<size_t>(attempts), received.size())
      << "a message in flight when close() ran was dropped";
  for (size_t i = 0; i < received.size(); i++) {
    EXPECT_EQ(expected, received[i]) << "message " << i;
  }
}

// Connects to 127.0.0.1:port and completes a WebSocket handshake for path,
// returning the socket, or INVALID_SOCKET.
static socket_t connect_raw_websocket(int port, const std::string &path) {
  auto sock = ::socket(AF_INET, SOCK_STREAM, 0);
  if (sock == INVALID_SOCKET) { return sock; }
  detail::set_socket_opt_time(sock, SOL_SOCKET, SO_RCVTIMEO, 5, 0);

  sockaddr_in addr{};
  addr.sin_family = AF_INET;
  addr.sin_port = htons(static_cast<uint16_t>(port));
  ::inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
  std::string req = "GET " + path +
                    " HTTP/1.1\r\n"
                    "Host: 127.0.0.1\r\n"
                    "Upgrade: websocket\r\n"
                    "Connection: Upgrade\r\n"
                    "Sec-WebSocket-Key: AAAAAAAAAAAAAAAAAAAAAA==\r\n"
                    "Sec-WebSocket-Version: 13\r\n"
                    "\r\n";
  std::string res;
  if (::connect(sock, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)) == 0 &&
      detail::send_socket(sock, req.data(), req.size(), 0) ==
          static_cast<ssize_t>(req.size())) {
    char c;
    while (res.find("\r\n\r\n") == std::string::npos &&
           ::recv(sock, &c, 1, 0) == 1) {
      res += c;
    }
  }
  if (res.find(" 101 ") == std::string::npos) {
    detail::close_socket(sock);
    return INVALID_SOCKET;
  }
  return sock;
}

// A client frame with an all-zero mask key, so the payload goes out verbatim.
// The payload must fit the 7-bit length field.
static std::string masked_frame(uint8_t first_byte,
                                const std::string &payload) {
  std::string f;
  f += static_cast<char>(first_byte);
  f += static_cast<char>(0x80 | payload.size());
  f.append(4, '\0');
  return f + payload;
}

TEST(WebSocketTest, AssemblesFragmentsAroundAPing) {
  std::atomic<bool> done{false};
  std::string received;

  Server svr;
  svr.set_websocket_ping_interval(0);
  svr.WebSocket("/ws", [&](const Request &, ws::WebSocket &ws) {
    std::string msg;
    if (ws.read(msg) == ws::Binary) { received = msg; }
    done = true;
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto sock = connect_raw_websocket(port, "/ws");
  ASSERT_NE(INVALID_SOCKET, sock);
  auto se_sock = detail::scope_exit([&] { detail::close_socket(sock); });

  auto frames = masked_frame(0x02, "Hel") + // Binary, more to come
                masked_frame(0x89, "p") +   // FIN + Ping
                masked_frame(0x80, "lo");   // FIN + Continuation
  detail::send_socket(sock, frames.data(), frames.size(), 0);

  for (int i = 0; i < 500 && !done; i++) {
    std::this_thread::sleep_for(std::chrono::milliseconds(10));
  }
  ASSERT_TRUE(done);
  EXPECT_EQ("Hello", received);

  // The Ping between the fragments is answered with a Pong.
  char pong[3];
  ASSERT_EQ(3, ::recv(sock, pong, sizeof(pong), MSG_WAITALL));
  EXPECT_EQ(std::string("\x8a\x01p", 3), std::string(pong, 3));
}

TEST(WebSocketTest, NegativePingIntervalSendsNoPings) {
  Server svr;
  svr.set_websocket_ping_interval(-1);
  svr.WebSocket("/ws", [&](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto sock = connect_raw_websocket(port, "/ws");
  ASSERT_NE(INVALID_SOCKET, sock);
  auto se_sock = detail::scope_exit([&] { detail::close_socket(sock); });

  // Nothing comes while the client stays quiet.
  detail::set_socket_opt_time(sock, SOL_SOCKET, SO_RCVTIMEO, 0, 300000);
  char c;
  EXPECT_EQ(-1, ::recv(sock, &c, 1, 0));
}

// The client's heartbeat gives up on a peer that leaves its pings unanswered,
// and that has to end a read() already waiting on the peer, on every platform.
static void check_pong_timeout_ends_read(Server &svr, const char *scheme) {
  // The peer sends no pings, and its handler never calls read(), which is
  // where pongs are written.
  std::mutex mutex;
  std::condition_variable cv;
  auto release = false;
  svr.set_websocket_ping_interval(0);
  svr.WebSocket("/ws", [&](const Request &, ws::WebSocket &) {
    std::unique_lock<std::mutex> lock(mutex);
    cv.wait(lock, [&] { return release; });
  });

  auto port = svr.bind_to_any_port(HOST);
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    {
      std::lock_guard<std::mutex> lock(mutex);
      release = true;
    }
    cv.notify_all();
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  ws::WebSocketClient client(std::string(scheme) +
                             "://localhost:" + std::to_string(port) + "/ws");
#ifdef CPPHTTPLIB_SSL_ENABLED
  client.enable_server_certificate_verification(false);
#endif
  // A ping a second, given up on after two go unanswered: about 3s
  client.set_websocket_ping_interval(1);
  client.set_websocket_max_missed_pongs(2);
  // Well past that, so that a read the timeout ends instead stands out
  client.set_read_timeout(10);
  ASSERT_TRUE(client.connect());

  auto start = std::chrono::steady_clock::now();
  std::string msg;
  EXPECT_EQ(ws::Fail, client.read(msg));
  EXPECT_LT(std::chrono::duration_cast<std::chrono::milliseconds>(
                std::chrono::steady_clock::now() - start)
                .count(),
            6000);
  EXPECT_FALSE(client.is_open());
}

TEST(WebSocketTest, PongTimeoutEndsABlockedRead) {
  Server svr;
  check_pong_timeout_ends_read(svr, "ws");
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(WebSocketTest, PongTimeoutEndsABlockedReadOverTLS) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  check_pong_timeout_ends_read(svr, "wss");
}
#endif

TEST(WebSocketTest, AnswersAMalformedCloseWithProtocolError) {
  Server svr;
  svr.set_websocket_ping_interval(0);
  svr.WebSocket("/ws", [&](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {}
  });

  auto port = svr.bind_to_any_port("127.0.0.1");
  std::thread t([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  // Each Close payload and the reply it should get: an echo when valid, 1002
  // otherwise.
  std::vector<std::pair<std::string, std::string>> cases = {
      {std::string("\x03\xe8") + "bye", std::string("\x03\xe8") + "bye"},
      {std::string("\x03"), std::string("\x03\xea")},         // 1 byte
      {std::string("\x03\xed"), std::string("\x03\xea")},     // 1005
      {std::string("\x03\xe8\xff"), std::string("\x03\xea")}, // bad UTF-8
  };
  // Also between the fragments of a message.
  for (const auto &prefix : {std::string(), masked_frame(0x02, "a")}) {
    for (const auto &c : cases) {
      auto sock = connect_raw_websocket(port, "/ws");
      ASSERT_NE(INVALID_SOCKET, sock);
      auto frames = prefix + masked_frame(0x88, c.first);
      detail::send_socket(sock, frames.data(), frames.size(), 0);

      std::string reply;
      char buf[256];
      while (reply.size() < 2 + c.second.size()) {
        auto n = ::recv(sock, buf, sizeof(buf), 0);
        if (n <= 0) { break; }
        reply.append(buf, static_cast<size_t>(n));
      }
      detail::close_socket(sock);
      EXPECT_EQ(std::string("\x88") + static_cast<char>(c.second.size()) +
                    c.second,
                reply);
    }
  }
}

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
class WebSocketSSLIntegrationTest : public ::testing::Test {
protected:
  void SetUp() override {
    server_ = httplib::detail::make_unique<SSLServer>(SERVER_CERT_FILE,
                                                      SERVER_PRIVATE_KEY_FILE);
    server_->WebSocket("/ws-echo", [](const Request &, ws::WebSocket &ws) {
      std::string msg;
      ws::ReadResult ret;
      while ((ret = ws.read(msg))) {
        if (ret == ws::Binary) {
          ws.send(msg.data(), msg.size());
        } else {
          ws.send(msg);
        }
      }
    });
    port_ = server_->bind_to_any_port(HOST);
    server_thread_ = std::thread([this]() { server_->listen_after_bind(); });
    server_->wait_until_ready();
  }

  void TearDown() override {
    server_->stop();
    if (server_thread_.joinable()) { server_thread_.join(); }
  }

  std::unique_ptr<SSLServer> server_;
  std::thread server_thread_;
  int port_ = 0;
};

TEST_F(WebSocketSSLIntegrationTest, VerifiersDecide) {
  auto url = "wss://localhost:" + std::to_string(port_) + "/ws-echo";
  {
    ws::WebSocketClient client(url);
    client.enable_server_certificate_verification(false);
    auto calls = 0;
    client.set_server_certificate_verifier([&](const tls::VerifyContext &) {
      calls++;
      return false;
    });
    EXPECT_FALSE(client.connect());
    EXPECT_GT(calls, 0);
  }
  {
    ws::WebSocketClient client(url);
    client.enable_server_certificate_verification(false);
    client.set_session_verifier([](tls::session_t) {
      return SSLVerifierResponse::CertificateRejected;
    });
    EXPECT_FALSE(client.connect());
  }
  {
    ws::WebSocketClient client(url);
    client.enable_server_certificate_verification(false);
    client.set_session_verifier([](tls::session_t) {
      return SSLVerifierResponse::CertificateAccepted;
    });
    EXPECT_TRUE(client.connect());
  }
}

TEST_F(WebSocketSSLIntegrationTest, TextEcho) {
  ws::WebSocketClient client("wss://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.enable_server_certificate_verification(false);
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.is_open());

  ASSERT_TRUE(client.send("Hello WSS"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("Hello WSS", msg);

  client.close();
}

// Regression test (GHSA-w7p7-f35j-mw7q): shutdown_and_close() used to free the
// TLS session before ws_->close() sent the close frame. Because the WebSocket's
// SSLSocketStream keeps a raw pointer to that session, sending the close frame
// then read/wrote a freed SSL object (use-after-free). Destroying an open wss
// client (without calling close() first) is the only path that runs
// shutdown_and_close() while the WebSocket is still open, so it reproduces the
// bug exactly.
//
// NOTE: the offending read/write happens inside OpenSSL, so ASan only flags it
// when linked against an instrumented libssl; run under Valgrind to catch it
// with a stock OpenSSL. The short timeouts keep a regression from wedging the
// suite (the freed session otherwise stalls on the close handshake) — this test
// is a memory-tool tripwire, not a pass/fail assertion on stock builds.
TEST_F(WebSocketSSLIntegrationTest, DestroyWhileOpenSendsCloseOverLiveSession) {
  {
    ws::WebSocketClient client("wss://localhost:" + std::to_string(port_) +
                               "/ws-echo");
    client.enable_server_certificate_verification(false);
    client.set_read_timeout(2, 0);
    client.set_write_timeout(2, 0);
    ASSERT_TRUE(client.connect());
    ASSERT_TRUE(client.is_open());
    ASSERT_TRUE(client.send("still open"));
    // Intentionally do NOT call client.close(): leaving scope runs
    // shutdown_and_close() with the WebSocket still open, which must send the
    // close frame while the TLS session is still alive.
  }
}

// Regression test (GHSA-w7p7-f35j-mw7q): reconnecting an open wss client runs
// shutdown_and_close() at the start of connect(), reproducing the same
// use-after-free within the test body rather than at scope exit. The second
// connect must succeed and echo, proving the close handshake ran over a live
// session. See the note above about memory-tool requirements.
TEST_F(WebSocketSSLIntegrationTest,
       ReconnectWhileOpenSendsCloseOverLiveSession) {
  ws::WebSocketClient client("wss://localhost:" + std::to_string(port_) +
                             "/ws-echo");
  client.enable_server_certificate_verification(false);
  client.set_read_timeout(2, 0);
  client.set_write_timeout(2, 0);

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.is_open());
  ASSERT_TRUE(client.send("still open"));

  // Reconnect without closing first: connect() calls shutdown_and_close() on
  // the still-open connection, which must not touch a freed TLS session.
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.is_open());
  ASSERT_TRUE(client.send("after reconnect"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("after reconnect", msg);

  client.close();
}
#endif

#ifdef CPPHTTPLIB_SSL_ENABLED
class WebSocketSSLCATest : public ::testing::Test {
protected:
  void SetUp() override {
    server_ = httplib::detail::make_unique<SSLServer>(SERVER_CERT2_FILE,
                                                      SERVER_PRIVATE_KEY_FILE);
    server_->WebSocket("/echo", [](const Request &, ws::WebSocket &ws) {
      std::string msg;
      while (ws.read(msg)) {
        ws.send(msg);
      }
    });
    port_ = server_->bind_to_any_port("127.0.0.1");
    server_thread_ = std::thread([this]() { server_->listen_after_bind(); });
    server_->wait_until_ready();
  }

  void TearDown() override {
    server_->stop();
    if (server_thread_.joinable()) { server_thread_.join(); }
  }

  std::string url() const {
    return "wss://127.0.0.1:" + std::to_string(port_) + "/echo";
  }

  std::unique_ptr<SSLServer> server_;
  std::thread server_thread_;
  int port_ = 0;
};

// A custom CA loaded as PEM verifies the server with full certificate
// verification enabled
TEST_F(WebSocketSSLCATest, LoadCaCertStoreVerifiesServer) {
  ws::WebSocketClient client(url());
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  client.load_ca_cert_store(cert.c_str(), cert.size());

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();
}

// A custom CA that does not cover the server must fail verification (the
// custom CA is exclusive; system certs are not loaded alongside it)
TEST_F(WebSocketSSLCATest, WrongCustomCaFailsVerification) {
  ws::WebSocketClient client(url());
  std::string cert;
  read_file(CLIENT_CA_CERT_FILE, cert);
  client.load_ca_cert_store(cert.c_str(), cert.size());

  auto res = client.connect();
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerVerification, res.error());
  EXPECT_EQ(-1, res.status());
  EXPECT_NE(0u, res.ssl_backend_error());
}

// The same CA as a file path rather than PEM in memory
TEST_F(WebSocketSSLCATest, SetCaCertPathVerifiesServer) {
  ws::WebSocketClient client(url());
  client.set_ca_cert_path(SERVER_CERT2_FILE);

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();
}

// ...and a CA file that does not cover the server still fails, so it is the
// path above that decides the outcome
TEST_F(WebSocketSSLCATest, WrongCaCertPathFailsVerification) {
  ws::WebSocketClient client(url());
  client.set_ca_cert_path(CLIENT_CA_CERT_FILE);

  ASSERT_FALSE(client.connect());
}

// Regression test: reconnecting with a native custom CA store used to reuse
// a store handle the previous TLS context had already freed (use-after-free
// under the OpenSSL backend). The context now lives as long as the client.
TEST_F(WebSocketSSLCATest, ReconnectWithCustomCaStore) {
  ws::WebSocketClient client(url());
  std::string cert;
  read_file(SERVER_CERT2_FILE, cert);
  client.set_ca_cert_store(tls::create_ca_store(cert.c_str(), cert.size()));

  ASSERT_TRUE(client.connect());
  client.close();

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("again"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("again", msg);
  client.close();
}

// Regression test: a certificate with a trusted chain but no identity match
// for the server IP must be rejected. The Mbed TLS backend used to skip
// verification entirely for IP hosts, so this connection succeeded there.
// SERVER_CERT_FILE has no IP SAN (CN only), so trusting it as a CA satisfies
// chain verification while the identity check must still fail.
TEST(WebSocketSSLVerifyTest, TrustedChainWrongIdentityFails) {
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
  ASSERT_TRUE(svr.is_valid());
  svr.WebSocket("/echo", [](const Request &, ws::WebSocket &ws) {
    std::string msg;
    while (ws.read(msg)) {
      ws.send(msg);
    }
  });
  auto port = svr.bind_to_any_port("127.0.0.1");
  auto t = std::thread([&]() { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  ws::WebSocketClient client("wss://127.0.0.1:" + std::to_string(port) +
                             "/echo");
  std::string cert;
  read_file(SERVER_CERT_FILE, cert);
  client.load_ca_cert_store(cert.c_str(), cert.size());

  ASSERT_FALSE(client.connect());
}

// The tests above all connect to an IP literal, for which RFC 6066 forbids
// SNI, so nothing binds the host name to the TLS session. These bind the
// server to "localhost" instead, the only shape that exercises the SNI and
// hostname-verification path with certificate verification left enabled.
class WebSocketSSLDnsHostTest : public ::testing::Test {
protected:
  void Start(const char *cert_file) {
    server_ = httplib::detail::make_unique<SSLServer>(cert_file,
                                                      SERVER_PRIVATE_KEY_FILE);
    ASSERT_TRUE(server_->is_valid());
    server_->WebSocket("/echo", [](const Request &, ws::WebSocket &ws) {
      std::string msg;
      while (ws.read(msg)) {
        ws.send(msg);
      }
    });
    port_ = server_->bind_to_any_port("localhost");
    server_thread_ = std::thread([this]() { server_->listen_after_bind(); });
    server_->wait_until_ready();
  }

  void TearDown() override {
    if (server_) { server_->stop(); }
    if (server_thread_.joinable()) { server_thread_.join(); }
  }

  std::string url() const {
    return "wss://localhost:" + std::to_string(port_) + "/echo";
  }

  std::unique_ptr<SSLServer> server_;
  std::thread server_thread_;
  int port_ = 0;
};

// cert2 carries a DNS:localhost SAN, so both the chain and the identity check
// out and the connection is usable
TEST_F(WebSocketSSLDnsHostTest, TrustedChainMatchingNameVerifies) {
  Start(SERVER_CERT2_FILE);

  ws::WebSocketClient client(url());
  client.set_ca_cert_path(SERVER_CERT2_FILE);

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();
}

// cert.pem has a CN but no SAN, so trusting it as a CA satisfies the chain
// while the identity check must still reject "localhost"
TEST_F(WebSocketSSLDnsHostTest, TrustedChainWrongNameFails) {
  Start(SERVER_CERT_FILE);

  ws::WebSocketClient client(url());
  client.set_ca_cert_path(SERVER_CERT_FILE);

  auto res = client.connect();
  ASSERT_FALSE(res);
  EXPECT_EQ(Error::SSLServerHostnameVerification, res.error());
  EXPECT_EQ(-1, res.status());
}

// Same setup as TrustedChainWrongNameFails, but with hostname verification
// disabled: the chain is still checked, only the identity check is skipped
TEST_F(WebSocketSSLDnsHostTest, HostnameVerificationDisabledAcceptsWrongName) {
  Start(SERVER_CERT_FILE);

  ws::WebSocketClient client(url());
  client.set_ca_cert_path(SERVER_CERT_FILE);
  client.enable_server_hostname_verification(false);

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();
}

// A CA that did not sign the server certificate fails the chain, even though
// the name would match
TEST_F(WebSocketSSLDnsHostTest, UntrustedChainFails) {
  Start(SERVER_CERT2_FILE);

  ws::WebSocketClient client(url());
  client.set_ca_cert_path(CLIENT_CA_CERT_FILE);

  ASSERT_FALSE(client.connect());
}

// With verification disabled, neither the chain nor the name is checked
TEST_F(WebSocketSSLDnsHostTest, VerificationDisabledAcceptsAnyName) {
  Start(SERVER_CERT_FILE);

  ws::WebSocketClient client(url());
  client.enable_server_certificate_verification(false);

  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.send("hello"));
  std::string msg;
  EXPECT_EQ(ws::Text, client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();
}

class WebSocketSSLPemMemoryTest : public ::testing::Test {
protected:
  void SetUp() override {
    server_ = httplib::detail::make_unique<SSLServer>(
        SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE, CLIENT_CA_CERT_FILE);
    ASSERT_TRUE(server_->is_valid());
    server_->WebSocket("/ws-echo", [](const Request &, ws::WebSocket &ws) {
      std::string msg;
      while (ws.read(msg)) {
        ws.send(msg);
      }
    });
    port_ = server_->bind_to_any_port("localhost");
    server_thread_ = std::thread([this]() { server_->listen_after_bind(); });
    server_->wait_until_ready();
  }

  void TearDown() override {
    server_->stop();
    if (server_thread_.joinable()) { server_thread_.join(); }
  }

  std::string url() const {
    return "wss://localhost:" + std::to_string(port_) + "/ws-echo";
  }

  void ConnectWithClientCert(const std::string &client_cert_file,
                             const std::string &client_private_key_file,
                             const char *private_key_password) {
    std::string cert_pem, key_pem;
    read_file(client_cert_file, cert_pem);
    read_file(client_private_key_file, key_pem);

    ws::WebSocketClient::PemMemory pem = {cert_pem.c_str(), cert_pem.size(),
                                          key_pem.c_str(), key_pem.size(),
                                          private_key_password};
    ConnectWithPem(pem);
  }

  void ConnectWithPem(const ws::WebSocketClient::PemMemory &pem) {
    ws::WebSocketClient client(url(), pem);
    ASSERT_TRUE(client.is_valid());
    client.enable_server_certificate_verification(false);

    ASSERT_TRUE(client.connect());
    ASSERT_TRUE(client.send("hello"));
    std::string msg;
    EXPECT_EQ(ws::Text, client.read(msg));
    EXPECT_EQ("hello", msg);
    client.close();
  }

  std::unique_ptr<SSLServer> server_;
  std::thread server_thread_;
  int port_ = 0;
};

TEST_F(WebSocketSSLPemMemoryTest, ClientCertAccepted) {
  ConnectWithClientCert(CLIENT_CERT_FILE, CLIENT_PRIVATE_KEY_FILE, nullptr);
}

// Control for the tests above: the fixture's server really does require a
// client certificate, so it is the PEM the constructor installed that decides
// the outcome.
TEST_F(WebSocketSSLPemMemoryTest, NoClientCertRejected) {
  ws::WebSocketClient client(url());
  ASSERT_TRUE(client.is_valid());
  client.enable_server_certificate_verification(false);

  EXPECT_FALSE(client.connect());
}

TEST_F(WebSocketSSLPemMemoryTest, EncryptedClientCertAccepted) {
  ConnectWithClientCert(CLIENT_ENCRYPTED_CERT_FILE,
                        CLIENT_ENCRYPTED_PRIVATE_KEY_FILE,
                        CLIENT_ENCRYPTED_PRIVATE_KEY_PASS);
}

// The PemMemory lengths are honoured, so the PEM needs no NUL terminator
TEST_F(WebSocketSSLPemMemoryTest, ExactSizeBuffersAccepted) {
  std::string cert_pem, key_pem;
  read_file(CLIENT_CERT_FILE, cert_pem);
  read_file(CLIENT_PRIVATE_KEY_FILE, key_pem);
  std::vector<char> cert(cert_pem.begin(), cert_pem.end());
  std::vector<char> key(key_pem.begin(), key_pem.end());

  ws::WebSocketClient::PemMemory pem = {cert.data(), cert.size(), key.data(),
                                        key.size(), nullptr};
  ConnectWithPem(pem);
}
#endif

#if !defined(_WIN32)
TEST(SymlinkTest, SymlinkEscapeFromBaseDirectory) {
  auto secret_dir = std::string("./symlink_test_secret");
  auto served_dir = std::string("./symlink_test_served");
  auto secret_file = secret_dir + "/secret.txt";
  auto symlink_path = served_dir + "/escape";

  // Setup: create directories and files
  mkdir(secret_dir.c_str(), 0755);
  mkdir(served_dir.c_str(), 0755);

  {
    std::ofstream ofs(secret_file);
    ofs << "SECRET_DATA";
  }

  // Create symlink using absolute path so it resolves correctly
#ifdef PATH_MAX
  char abs_secret[PATH_MAX];
  ASSERT_NE(nullptr, realpath(secret_dir.c_str(), abs_secret));
#else
  auto abs_secret = realpath(secret_dir.c_str(), nullptr);
  auto abs_secret_guard = detail::scope_exit([&]() { std::free(abs_secret); });
  ASSERT_NE(nullptr, abs_secret);
#endif
  ASSERT_EQ(0, symlink(abs_secret, symlink_path.c_str()));

  auto se = detail::scope_exit([&] {
    unlink(symlink_path.c_str());
    unlink(secret_file.c_str());
    rmdir(served_dir.c_str());
    rmdir(secret_dir.c_str());
  });

  Server svr;
  svr.set_mount_point("/", served_dir);

  auto listen_thread = std::thread([&svr]() { svr.listen("localhost", PORT); });
  auto se2 = detail::scope_exit([&] {
    svr.stop();
    listen_thread.join();
  });
  svr.wait_until_ready();

  Client cli("localhost", PORT);

  // Symlink pointing outside base dir should be blocked
  auto res = cli.Get("/escape/secret.txt");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::Forbidden_403, res->status);
}
#endif

// Sends `outer_head` (with every "{len}" replaced by the length of an embedded
// "GET /smuggled" request), reads the first response, and only then sends the
// embedded request as the body. Returns how many times /smuggled ran.
//
// The body is sent AFTER receiving the first response (as in the original
// PoC) so that the stream_line_reader cannot buffer it together with the
// headers of the first request.
static int count_smuggled_requests(const std::string &outer_head,
                                   std::string &first_response) {
  Server svr;
  svr.set_mount_point("/", "./www");

  std::atomic<int> smuggled_count(0);
  svr.Get("/smuggled", [&](const Request &, Response &res) {
    smuggled_count++;
    res.set_content("oops", "text/plain");
  });
  svr.Post("/post", [&](const Request &req, Response &res) {
    res.set_content(req.body, "text/plain");
  });

  auto port = svr.bind_to_any_port("localhost");
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto error = Error::Success;
  auto sock = detail::create_client_socket(
      "localhost", "", port, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/2, 0,
      /*read_timeout_sec=*/2, 0,
      /*write_timeout_sec=*/2, 0, std::string(), error);
  EXPECT_NE(INVALID_SOCKET, sock);
  if (sock == INVALID_SOCKET) { return -1; }
  auto sock_se = detail::scope_exit([&] { detail::close_socket(sock); });

  // The "smuggled" request will be sent as the body of the outer request
  std::string smuggled = "GET /smuggled HTTP/1.1\r\n"
                         "Host: localhost\r\n"
                         "Connection: close\r\n"
                         "\r\n";

  auto head = outer_head;
  auto len = std::to_string(smuggled.size());
  for (auto pos = head.find("{len}"); pos != std::string::npos;
       pos = head.find("{len}", pos + len.size())) {
    head.replace(pos, 5, len);
  }

  // Step 1: Send only the outer request headers (no body yet)
  auto sent = detail::send_socket(sock, head.data(), head.size(), 0);
  EXPECT_EQ(static_cast<ssize_t>(head.size()), sent);

  // Step 2: Read the first response
  char buf[4096];
  for (;;) {
    auto n = recv(sock, buf, sizeof(buf), 0);
    if (n <= 0) break;
    first_response.append(buf, static_cast<size_t>(n));
    // Stop once we have a complete response (headers + body)
    auto hdr_end = first_response.find("\r\n\r\n");
    if (hdr_end != std::string::npos) {
      // Check for Content-Length to know when the body is complete
      auto cl_pos = first_response.find("Content-Length:");
      if (cl_pos != std::string::npos) {
        auto cl_val_start = cl_pos + 15; // length of "Content-Length:"
        auto cl_val_end = first_response.find("\r\n", cl_val_start);
        auto cl = std::stoul(
            first_response.substr(cl_val_start, cl_val_end - cl_val_start));
        if (first_response.size() >= hdr_end + 4 + cl) { break; }
      } else {
        break; // No Content-Length, assume headers-only response
      }
    }
  }

  // Step 3: Now send the body, which looks like a new HTTP request. On a
  // vulnerable server the keep-alive loop reads this as a second request. The
  // server may already have closed the connection, so the result is ignored.
  detail::send_socket(sock, smuggled.data(), smuggled.size(), 0);

  // Half-close so that a server which drained the body sees EOF and closes,
  // instead of the read below waiting for the read timeout.
#ifdef _WIN32
  ::shutdown(sock, SD_SEND);
#else
  ::shutdown(sock, SHUT_WR);
#endif

  // Step 4: Read until the server closes the connection
  for (;;) {
    auto n = recv(sock, buf, sizeof(buf), 0);
    if (n <= 0) break;
  }

  return smuggled_count.load();
}

TEST(RequestSmugglingTest, UnconsumedGETBodyOnFileHandler) {
  // A GET request with Content-Length to a static file handler must have its
  // body drained before the keep-alive connection is reused. Otherwise the
  // unread body bytes are interpreted as the next HTTP request.
  std::string first_response;
  EXPECT_EQ(0, count_smuggled_requests("GET /file HTTP/1.1\r\n"
                                       "Host: localhost\r\n"
                                       "Content-Length: {len}\r\n"
                                       "\r\n",
                                       first_response));
  EXPECT_EQ(0u, first_response.find("HTTP/1.1 200"));
}

TEST(RequestSmugglingTest, InvalidContentLengthRejected) {
  // RFC 9112 §6.3: a Content-Length that is not a valid decimal length must
  // be answered with 400 and the connection closed. Treating it as "no body"
  // leaves the body to be parsed as the next request.
  const char *values[] = {"{len}, {len}", "+{len}", "0x2e", "", " {len}x"};
  const char *targets[] = {
      "GET /file",      // handler that never reads the body
      "GET /not-found", // no handler matches (404)
      "POST /post",     // handler that reads the body
  };
  for (auto target : targets) {
    for (auto value : values) {
      std::string first_response;
      EXPECT_EQ(0, count_smuggled_requests(std::string(target) +
                                               " HTTP/1.1\r\n"
                                               "Host: localhost\r\n"
                                               "Content-Length: " +
                                               value + "\r\n\r\n",
                                           first_response))
          << target << " with Content-Length: " << value;
      EXPECT_EQ(0u, first_response.find("HTTP/1.1 400"))
          << target << " with Content-Length: " << value;
    }
  }
}

TEST(RequestSmugglingTest, RejectedRequestLineClosesConnection) {
  // A 400 for an unparseable request line leaves the rest of the message
  // unread, so the connection must be closed rather than reused.
  std::string first_response;
  EXPECT_EQ(0, count_smuggled_requests("FOO /file HTTP/1.1\r\n"
                                       "Host: localhost\r\n"
                                       "Content-Length: {len}\r\n"
                                       "\r\n",
                                       first_response));
  EXPECT_EQ(0u, first_response.find("HTTP/1.1 400"));
}

TEST(RequestSmugglingTest, RejectedHeadersCloseConnection) {
  // Same as above for a header block that fails to parse.
  std::string first_response;
  EXPECT_EQ(0, count_smuggled_requests("GET /file HTTP/1.1\r\n"
                                       "Host: localhost\r\n"
                                       "Bad Header\r\n"
                                       "Content-Length: {len}\r\n"
                                       "\r\n",
                                       first_response));
  EXPECT_EQ(0u, first_response.find("HTTP/1.1 400"));
}

TEST(RequestSmugglingTest, ErrorResponseClosesConnection) {
  // RFC 9112 §9.6: an error response carries "Connection: close", so the
  // server must not read another request on that connection, even when the
  // request had no body to drain.
  std::string first_response;
  EXPECT_EQ(0, count_smuggled_requests("GET /not-found HTTP/1.1\r\n"
                                       "Host: localhost\r\n"
                                       "\r\n",
                                       first_response));
  EXPECT_EQ(0u, first_response.find("HTTP/1.1 404"));
  EXPECT_NE(std::string::npos, first_response.find("Connection: close"));
}

TEST(RequestSmugglingTest, AbortedContentReaderClosesConnection) {
  // A content reader that stops early leaves the stream inside the body.
  // Draining the whole Content-Length from there, or reading the body again,
  // reads into the next request, and whatever follows is parsed as a request
  // of its own.
  Server svr;
  std::atomic<int> smuggled_count(0);
  svr.Get("/smuggled", [&](const Request &, Response &) { smuggled_count++; });
  svr.Post("/upload", [](const Request &req, Response &res,
                         const ContentReader &content_reader) {
    // Stop at the last chunk, so the whole body has been read however it
    // arrives.
    auto length = req.get_header_value_u64("Content-Length");
    size_t total = 0;
    auto consumed = content_reader([&](const char *, size_t n) {
      total += n;
      return total < length;
    });
    EXPECT_FALSE(consumed);
    if (req.has_param("retry")) {
      EXPECT_FALSE(content_reader([](const char *, size_t) { return true; }));
    }
    // Replace the 400 the aborted read set, which would close the connection.
    res.set_redirect("/done");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  // A front end sees the second request as a POST whose body is the GET. The
  // first body is as long as the POST's headers, so draining it again reads
  // exactly those and leaves the GET to be parsed next.
  std::string inner = "GET /smuggled HTTP/1.1\r\n"
                      "Host: localhost\r\n"
                      "\r\n";
  std::string second_head = "POST /post HTTP/1.1\r\n"
                            "Host: localhost\r\n"
                            "Content-Length: " +
                            std::to_string(inner.size()) +
                            "\r\n"
                            "\r\n";
  for (auto target : {"/upload", "/upload?retry"}) {
    smuggled_count = 0;
    std::string request = "POST " + std::string(target) +
                          " HTTP/1.1\r\n"
                          "Host: localhost\r\n"
                          "Content-Length: " +
                          std::to_string(second_head.size()) +
                          "\r\n"
                          "\r\n" +
                          std::string(second_head.size(), 'A') + second_head +
                          inner;

    std::string response;
    ASSERT_TRUE(send_request(2, request, &response, port)) << target;

    EXPECT_EQ(0u, response.find("HTTP/1.1 302")) << target;
    EXPECT_NE(std::string::npos, response.find("Connection: close")) << target;
    EXPECT_EQ(std::string::npos, response.find("HTTP/1.1", 1)) << target;
    EXPECT_EQ(0, smuggled_count.load()) << target;
  }
}

// An error response closes the connection anyway, so the body is left unread
// with a redirect, such as one to a login page.
static void serve_redirects(Server &svr,
                            const std::function<void(int)> &client) {
  svr.set_pre_routing_handler([](const Request &, Response &res) {
    res.set_redirect("/login");
    return Server::HandlerResponse::Handled;
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  client(port);
}

TEST(UnreadBodyDrainTest, LongerThanTheLimitClosesTheConnection) {
  Server svr;
  serve_redirects(svr, [](int port) {
    auto body = std::string(CPPHTTPLIB_UNREAD_PAYLOAD_MAX_LENGTH + 1, 'x');
    auto req = "POST / HTTP/1.1\r\nHost: localhost\r\nContent-Length: " +
               std::to_string(body.size()) + "\r\n\r\n" + body +
               "GET / HTTP/1.1\r\nHost: localhost\r\n\r\n";

    std::string resp;
    ASSERT_TRUE(send_request(1, req, &resp, port));
    ASSERT_EQ(0u, resp.find("HTTP/1.1 302"));
    EXPECT_EQ(std::string::npos, resp.find("HTTP/1.1", 1));
  });
}

TEST(UnreadBodyDrainTest, SlowerThanTheReadTimeoutClosesTheConnection) {
  Server svr;
  svr.set_read_timeout(0, 200000);
  serve_redirects(svr, [](int port) {
    // A byte every 100 ms keeps each read within the read timeout, but not the
    // body as a whole, so the server closes and the bytes sent after that fail.
    std::vector<std::string> parts{"POST / HTTP/1.1\r\nHost: localhost\r\n"
                                   "Content-Length: 10\r\n\r\n"};
    parts.resize(11, "x");
    EXPECT_FALSE(send_request_in_parts(1, parts, nullptr, port));
  });
}

TEST(RequestSmugglingTest, ContentLengthAndTransferEncodingRejected) {
  // RFC 9112 §6.3: A request with both Content-Length and Transfer-Encoding
  // must be rejected with 400 Bad Request.
  Server svr;
  svr.Post("/test", [&](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // Exact "chunked"
  {
    auto req = "POST /test HTTP/1.1\r\n"
               "Host: localhost\r\n"
               "Content-Length: 5\r\n"
               "Transfer-Encoding: chunked\r\n"
               "Connection: close\r\n"
               "\r\n"
               "hello";

    std::string response;
    ASSERT_TRUE(send_request(1, req, &response));
    EXPECT_EQ("HTTP/1.1 400 Bad Request",
              response.substr(0, response.find("\r\n")));
  }

  // Multi-valued Transfer-Encoding (e.g., "gzip, chunked")
  {
    auto req = "POST /test HTTP/1.1\r\n"
               "Host: localhost\r\n"
               "Content-Length: 5\r\n"
               "Transfer-Encoding: gzip, chunked\r\n"
               "Connection: close\r\n"
               "\r\n"
               "hello";

    std::string response;
    ASSERT_TRUE(send_request(1, req, &response));
    EXPECT_EQ("HTTP/1.1 400 Bad Request",
              response.substr(0, response.find("\r\n")));
  }
}

TEST(RequestSmugglingTest, NonFinalChunkedTransferEncodingRejected) {
  Server svr;
  svr.Post("/test", [&](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  thread t = thread([&] { svr.listen(HOST, PORT); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  // RFC 9112 6.3: when chunked is not the final transfer coding the body
  // length cannot be determined, so the server must answer 400 and close
  // rather than treat the request as bodyless and leave the body in the
  // socket for the next request to pick up.
  for (const auto &transfer_encoding : {"gzip", "chunked, gzip"}) {
    auto req = std::string("POST /test HTTP/1.1\r\n") + "Host: localhost\r\n" +
               "Transfer-Encoding: " + transfer_encoding + "\r\n" + "\r\n";

    std::string response;
    ASSERT_TRUE(send_request(1, req, &response));
    EXPECT_EQ("HTTP/1.1 400 Bad Request",
              response.substr(0, response.find("\r\n")))
        << transfer_encoding;
  }

  // RFC 9110 5.3: the codings may also be split across several
  // Transfer-Encoding lines, which combine in the order they were received.
  // "chunked" followed by "gzip" therefore ends in gzip and must be rejected
  // just like the single-line "chunked, gzip" above.
  {
    auto req = "POST /test HTTP/1.1\r\n"
               "Host: localhost\r\n"
               "Transfer-Encoding: chunked\r\n"
               "Transfer-Encoding: gzip\r\n"
               "\r\n"
               "0\r\n\r\n";

    std::string response;
    ASSERT_TRUE(send_request(1, req, &response));
    EXPECT_EQ("HTTP/1.1 400 Bad Request",
              response.substr(0, response.find("\r\n")));
  }
}

TEST(RequestSmugglingTest, TransferEncodingOtherThanChunkedNotImplemented) {
  Server svr;
  svr.Post("/test", [&](const Request &, Response &res) {
    res.set_content("ok", "text/plain");
  });

  auto port = svr.bind_to_any_port(HOST);
  ASSERT_GT(port, 0);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
    ASSERT_FALSE(svr.is_running());
  });
  svr.wait_until_ready();

  for (auto transfer_encoding :
       {"Transfer-Encoding: gzip, chunked\r\n",
        "Transfer-Encoding: gzip\r\nTransfer-Encoding: chunked\r\n",
        "Transfer-Encoding: chunked\r\nTransfer-Encoding: chunked\r\n"}) {
    auto req = std::string("POST /test HTTP/1.1\r\nHost: localhost\r\n") +
               transfer_encoding + "\r\n0\r\n\r\n";

    std::string response;
    ASSERT_TRUE(send_request(1, req, &response, port)) << transfer_encoding;
    EXPECT_EQ("HTTP/1.1 501 Not Implemented",
              response.substr(0, response.find("\r\n")))
        << transfer_encoding;
    EXPECT_NE(std::string::npos, response.find("Connection: close"))
        << transfer_encoding;
  }
}

// Regression for issue #2450: a DELETE without Content-Length on a
// keep-alive connection must not let the post-response drain consume the
// next request's bytes.
TEST(KeepAliveTest, DeleteWithoutContentLengthDoesNotEatNextRequest) {
  Server svr;

  std::atomic<int> delete_count(0);
  svr.Delete("/items/:id", [&](const Request &, Response &res) {
    delete_count++;
    res.status = StatusCode::NoContent_204;
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto error = Error::Success;
  auto sock = detail::create_client_socket(
      HOST, "", port, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/2, 0,
      /*read_timeout_sec=*/2, 0,
      /*write_timeout_sec=*/2, 0, std::string(), error);
  ASSERT_NE(INVALID_SOCKET, sock);
  auto sock_se = detail::scope_exit([&] { detail::close_socket(sock); });

  auto send_request_and_read_response = [&](const std::string &req,
                                            std::string &out) -> bool {
    auto sent = detail::send_socket(sock, req.data(), req.size(), 0);
    if (sent != static_cast<ssize_t>(req.size())) { return false; }
    char buf[4096];
    for (;;) {
      auto n = recv(sock, buf, sizeof(buf), 0);
      if (n <= 0) { return !out.empty(); }
      out.append(buf, static_cast<size_t>(n));
      if (out.find("\r\n\r\n") != std::string::npos) { return true; }
    }
  };

  std::string req1 = "DELETE /items/1 HTTP/1.1\r\n"
                     "Host: localhost\r\n"
                     "\r\n";
  std::string resp1;
  ASSERT_TRUE(send_request_and_read_response(req1, resp1));
  EXPECT_NE(std::string::npos, resp1.find("HTTP/1.1 204"));

  std::string req2 = "DELETE /items/2 HTTP/1.1\r\n"
                     "Host: localhost\r\n"
                     "Connection: close\r\n"
                     "\r\n";
  std::string resp2;
  ASSERT_TRUE(send_request_and_read_response(req2, resp2));
  EXPECT_NE(std::string::npos, resp2.find("HTTP/1.1 204"));

  EXPECT_EQ(2, delete_count.load());
}

TEST(KeepAliveTest, UnconsumedChunkedBodyIsNotDrainedWhenResponseCloses) {
  Server svr;
  svr.Post("/ingest", [&](const Request &, Response &res,
                          const ContentReader &content_reader) {
    auto consumed = content_reader([](const char *, size_t) { return false; });
    EXPECT_FALSE(consumed);
    res.status = StatusCode::Conflict_409;
    res.set_header("Connection", "close");
  });

  auto port = svr.bind_to_any_port(HOST);
  thread t = thread([&] { svr.listen_after_bind(); });
  auto se = detail::scope_exit([&] {
    svr.stop();
    t.join();
  });
  svr.wait_until_ready();

  auto error = Error::Success;
  auto sock = detail::create_client_socket(
      HOST, "", port, AF_UNSPEC, false, false, nullptr,
      /*connection_timeout_sec=*/2, 0,
      /*read_timeout_sec=*/1, 0,
      /*write_timeout_sec=*/2, 0, std::string(), error);
  ASSERT_NE(INVALID_SOCKET, sock);
  auto sock_se = detail::scope_exit([&] { detail::close_socket(sock); });

  std::string request = "POST /ingest HTTP/1.1\r\n"
                        "Host: localhost\r\n"
                        "Transfer-Encoding: chunked\r\n"
                        "\r\n"
                        "4\r\n"
                        "data\r\n";
  auto sent = detail::send_socket(sock, request.data(), request.size(), 0);
  ASSERT_EQ(static_cast<ssize_t>(request.size()), sent);

  std::string response;
  ssize_t received = 0;
  do {
    char buf[4096];
    received = recv(sock, buf, sizeof(buf), 0);
    if (received > 0) { response.append(buf, static_cast<size_t>(received)); }
  } while (received > 0);

  EXPECT_NE(std::string::npos, response.find("HTTP/1.1 409 Conflict"));
  EXPECT_NE(std::string::npos, response.find("Connection: close"));
  EXPECT_EQ(0, received);
}

namespace no_proxy_test {

// Server bound to 127.0.0.1:<dynamic>, listen thread spawned by listen(),
// auto-stopped + joined on scope exit. Register handlers via svr() BEFORE
// calling listen().
class ScopedServer {
public:
  ScopedServer() { port_ = svr_.bind_to_any_port("127.0.0.1"); }
  ~ScopedServer() {
    svr_.stop();
    if (th_.joinable()) { th_.join(); }
  }
  Server &svr() { return svr_; }
  int port() const { return port_; }
  void listen() {
    th_ = std::thread([this] { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }

private:
  Server svr_;
  std::thread th_;
  int port_ = 0;
};

class ProxyAndTargetServers {
public:
  ProxyAndTargetServers() {
    proxy_mock_.Get(".*", [this](const Request &req, Response &res) {
      proxy_hits_++;
      last_had_proxy_authz_ = req.has_header("Proxy-Authorization");
      res.set_content("via-proxy", "text/plain");
    });
    target_.Get(".*", [this](const Request &req, Response &res) {
      target_hits_++;
      last_had_proxy_authz_ = req.has_header("Proxy-Authorization");
      res.set_content("direct", "text/plain");
    });

    proxy_port_ = proxy_mock_.bind_to_any_port("127.0.0.1");
    target_port_ = target_.bind_to_any_port("127.0.0.1");
    proxy_thread_ = std::thread([this] { proxy_mock_.listen_after_bind(); });
    target_thread_ = std::thread([this] { target_.listen_after_bind(); });
    proxy_mock_.wait_until_ready();
    target_.wait_until_ready();
  }

  ~ProxyAndTargetServers() {
    proxy_mock_.stop();
    target_.stop();
    if (proxy_thread_.joinable()) { proxy_thread_.join(); }
    if (target_thread_.joinable()) { target_thread_.join(); }
  }

  Server &proxy_mock() { return proxy_mock_; }
  Server &target() { return target_; }
  int proxy_port() const { return proxy_port_; }
  int target_port() const { return target_port_; }
  int proxy_hits() const { return proxy_hits_.load(); }
  int target_hits() const { return target_hits_.load(); }
  bool last_had_proxy_authz() const { return last_had_proxy_authz_.load(); }

  void reset_counters() {
    proxy_hits_ = 0;
    target_hits_ = 0;
    last_had_proxy_authz_ = false;
  }

private:
  Server proxy_mock_;
  Server target_;
  std::thread proxy_thread_;
  std::thread target_thread_;
  int proxy_port_ = 0;
  int target_port_ = 0;
  std::atomic<int> proxy_hits_{0};
  std::atomic<int> target_hits_{0};
  std::atomic<bool> last_had_proxy_authz_{false};
};

inline std::unique_ptr<Client> make_client(const std::string &host,
                                           ProxyAndTargetServers &s) {
  auto cli = detail::make_unique<Client>(host, s.target_port());
  cli->set_hostname_addr_map({{host, "127.0.0.1"}});
  cli->set_proxy("127.0.0.1", s.proxy_port());
  return cli;
}

} // namespace no_proxy_test

using no_proxy_test::make_client;
using no_proxy_test::ProxyAndTargetServers;

// A stream request carries the credentials a buffered request does
TEST(StreamRequestHeadTest, SendsTheClientsCredentials) {
  no_proxy_test::ScopedServer origin;
  origin.svr().Get("/x", [](const Request &req, Response &res) {
    res.set_content(req.get_header_value("Authorization"), "text/plain");
  });
  origin.listen();

  Client cli("127.0.0.1", origin.port());
  cli.set_basic_auth("user", "pass");
  auto handle = cli.open_stream("GET", "/x");
  ASSERT_TRUE(handle.is_valid());
  EXPECT_EQ("Basic dXNlcjpwYXNz", read_all(handle));

  Client bearer("127.0.0.1", origin.port());
  bearer.set_bearer_token_auth("tok");
  auto handle2 = bearer.open_stream("GET", "/x");
  ASSERT_TRUE(handle2.is_valid());
  EXPECT_EQ("Bearer tok", read_all(handle2));
}

// A plain HTTP proxy reads the target in absolute-form (RFC 9112 3.2.2) and
// takes its own credentials, as for a buffered request
TEST(StreamRequestHeadTest, GoesThroughAPlainHttpProxy) {
  std::string target, authz, proxy_authz;
  no_proxy_test::ScopedServer proxy;
  proxy.svr().Get(".*", [&](const Request &req, Response &res) {
    target = req.target;
    authz = req.get_header_value("Authorization");
    proxy_authz = req.get_header_value("Proxy-Authorization");
    res.set_content("ok", "text/plain");
  });
  proxy.listen();

  Client cli("origin.example", 8080);
  cli.set_proxy("127.0.0.1", proxy.port());
  cli.set_proxy_basic_auth("puser", "ppass");
  cli.set_basic_auth("user", "pass");
  auto handle = cli.open_stream("GET", "/x");
  ASSERT_TRUE(handle.is_valid());
  EXPECT_EQ("ok", read_all(handle));

  EXPECT_EQ("http://origin.example:8080/x", target);
  EXPECT_EQ("Basic dXNlcjpwYXNz", authz);
  EXPECT_EQ("Basic cHVzZXI6cHBhc3M=", proxy_authz);
}

// In absolute-form the path follows the authority, so a path that does not
// begin with '/' would make the proxy connect to another host
TEST(ProxyAbsoluteFormTest, PathMustNotExtendTheAuthority) {
  std::vector<std::string> targets;
  no_proxy_test::ScopedServer proxy;
  proxy.svr().Get(".*", [&](const Request &req, Response &res) {
    targets.push_back(req.target);
    res.set_content("ok", "text/plain");
  });
  proxy.listen();

  Client cli("origin.example", 8080);
  cli.set_proxy("127.0.0.1", proxy.port());
  cli.set_basic_auth("user", "pass");

  for (const auto &path : {"@evil.example/x", ".evil.example/x", ":81/x"}) {
    auto res = cli.Get(path);
    EXPECT_FALSE(res) << path;

    auto handle = cli.open_stream("GET", path);
    EXPECT_FALSE(handle.is_valid()) << path;
  }
  EXPECT_TRUE(targets.empty());

  auto res = cli.Get("/x");
  ASSERT_TRUE(res);
  ASSERT_EQ(1u, targets.size());
  EXPECT_EQ("http://origin.example:8080/x", targets[0]);
}

TEST(NoProxyTest, ExactHostnameBypasses) {
  ProxyAndTargetServers s;
  auto cli = make_client("example.com", s);
  cli->set_no_proxy({"example.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, SubdomainBypasses) {
  ProxyAndTargetServers s;
  auto cli = make_client("foo.example.com", s);
  cli->set_no_proxy({"example.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, EvilExampleDoesNotMatchExample) {
  // Regression guard: "evilexample.com" must not be considered a subdomain
  // of "example.com". Without the dot-boundary rule, a naive endsWith
  // check would let traffic bypass the proxy and leak credentials direct
  // to the attacker host.
  ProxyAndTargetServers s;
  auto cli = make_client("evilexample.com", s);
  cli->set_no_proxy({"example.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, ExampleDotEvilDoesNotMatchExample) {
  ProxyAndTargetServers s;
  auto cli = make_client("example.com.evil.com", s);
  cli->set_no_proxy({"example.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, LeadingDotPatternMatchesBareDomain) {
  ProxyAndTargetServers s;
  auto cli = make_client("example.com", s);
  cli->set_no_proxy({".example.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, CaseInsensitiveHostname) {
  ProxyAndTargetServers s;
  auto cli = make_client("Example.COM", s);
  cli->set_no_proxy({"EXAMPLE.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, TrailingDotIsNormalized) {
  ProxyAndTargetServers s;
  auto cli = make_client("example.com.", s);
  cli->set_no_proxy({"example.com"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, TrailingDotOnEntryIsNormalized) {
  // Trailing dots must be normalized on BOTH sides — host and entry.
  // An implementation that only strips the host-side trailing dot would
  // fail to match host "example.com" against entry "example.com." because
  // a literal substring search would compare 11 chars against 12.
  ProxyAndTargetServers s;
  auto cli = make_client("example.com", s);
  cli->set_no_proxy({"example.com."});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, WildcardBypassesEverything) {
  ProxyAndTargetServers s;
  auto cli = make_client("anything.invalid.test", s);
  cli->set_no_proxy({"*"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, IPv4LiteralExactMatch) {
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"127.0.0.1"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, IPv6LiteralExactMatchAcrossEquivalentForms) {
  ProxyAndTargetServers s;
  Client cli("0:0:0:0:0:0:0:1", s.target_port());
  cli.set_hostname_addr_map({{"0:0:0:0:0:0:0:1", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"::1"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, BareIPv6LiteralMatchesIPv6Cidr) {
  // Regression guard: a bare IPv6 host literal (no surrounding brackets)
  // must still be recognized as IPv6 for CIDR matching. Implementations
  // that detect IPv6 only when the host begins with '[' would parse the
  // host as a hostname and miss the match.
  ProxyAndTargetServers s;
  Client cli("fe80::1", s.target_port());
  cli.set_hostname_addr_map({{"fe80::1", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"fe80::/10"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, BracketedIPv6EntryAccepted) {
  ProxyAndTargetServers s;
  Client cli("::1", s.target_port());
  cli.set_hostname_addr_map({{"::1", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"[::1]"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, BracketedIPv6CidrEntryAccepted) {
  ProxyAndTargetServers s;
  Client cli("fe80::1", s.target_port());
  cli.set_hostname_addr_map({{"fe80::1", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"[fe80::]/10"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, IPv4MappedIPv6IsNotCrossMatchedAgainstIPv4Entry) {
  // Policy: keep address families separate. "::ffff:1.2.3.4" must NOT
  // satisfy a NO_PROXY entry of "1.2.3.4". This avoids subtle bypass
  // tricks via address-family conversion.
  ProxyAndTargetServers s;
  Client cli("::ffff:127.0.0.1", s.target_port());
  cli.set_hostname_addr_map({{"::ffff:127.0.0.1", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"127.0.0.1"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, IPv4CidrMatch) {
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"127.0.0.0/8"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, IPv4CidrNonMatch) {
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"10.0.0.0/8"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, IPv4CidrPrefixZeroMatchesAll) {
  // Prefix 0 must not trigger the (1u << 32) shift UB. Result: every
  // IPv4 target matches.
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"0.0.0.0/0"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, IPv4CidrSingleHostNoSlash) {
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"127.0.0.1"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, MalformedCidrPrefixIsDropped) {
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"127.0.0.0/33"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, TrailingSlashCidrIsRejected) {
  // Empty prefix after the slash must be rejected, not silently treated as /32.
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"127.0.0.1/"});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, ProxyAuthorizationSuppressedWhenBypassed) {
  ProxyAndTargetServers s;
  auto cli = make_client("internal.corp", s);
  cli->set_proxy_basic_auth("u", "p");
  cli->set_no_proxy({"internal.corp"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(1, s.target_hits());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_FALSE(s.last_had_proxy_authz())
      << "Proxy-Authorization must not be sent direct to the target";
}

TEST(NoProxyTest, ProxyAuthorizationSentWhenNotBypassed) {
  ProxyAndTargetServers s;
  auto cli = make_client("public.example", s);
  cli->set_proxy_basic_auth("u", "p");
  cli->set_no_proxy({"internal.corp"}); // does not match

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_TRUE(s.last_had_proxy_authz());
}

TEST(NoProxyTest, ProxyAuthorizationSentWithOneEmptyCredential) {
  std::atomic<int> hits{0};
  std::atomic<int> hits_with_authz{0};

  no_proxy_test::ScopedServer proxy_mock;
  proxy_mock.svr().Get(".*", [&](const Request &req, Response &res) {
    hits++;
    if (req.has_header("Proxy-Authorization")) { hits_with_authz++; }
    if (req.target.find("/redir") != std::string::npos) {
      res.set_redirect("http://other.example/landed");
    } else {
      res.set_content("via-proxy", "text/plain");
    }
  });
  proxy_mock.listen();

  for (const auto &c : {std::make_pair("u", ""), std::make_pair("", "p")}) {
    hits = 0;
    hits_with_authz = 0;

    Client cli("public.example", 80);
    cli.set_proxy("127.0.0.1", proxy_mock.port());
    cli.set_proxy_basic_auth(c.first, c.second);
    cli.set_follow_location(true);

    // The redirect to another host goes through the proxy as well
    auto res = cli.Get("/redir");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(2, hits.load());
    EXPECT_EQ(2, hits_with_authz.load());
  }
}

TEST(NoProxyTest, EmptyNoProxyKeepsProxyOn) {
  ProxyAndTargetServers s;
  auto cli = make_client("anything.test", s);

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, PortSpecificEntryRejected) {
  ProxyAndTargetServers s;
  auto cli = make_client("example.com", s);
  cli->set_no_proxy({"example.com:8080"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, EmptyAndWhitespaceEntriesDropped) {
  ProxyAndTargetServers s;
  auto cli = make_client("anything.test", s);
  cli->set_no_proxy({"", "   ", "\t"});

  auto res = cli->Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(s.proxy_hits(), 1);
  EXPECT_EQ(0, s.target_hits());
}

TEST(NoProxyTest, ValidEntryWithSurroundingWhitespaceStillMatches) {
  // An entry with leading/trailing whitespace must still match — env-style
  // values are commonly pasted with stray spaces and an implementation
  // that feeds the raw token directly to inet_pton would fail to match
  // valid CIDRs because of the spaces.
  ProxyAndTargetServers s;
  Client cli("127.0.0.1", s.target_port());
  cli.set_proxy("127.0.0.1", s.proxy_port());
  cli.set_no_proxy({"  127.0.0.0/8  "});

  auto res = cli.Get("/");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(0, s.proxy_hits());
  EXPECT_EQ(1, s.target_hits());
}

TEST(NoProxyTest, RedirectToBypassedHostStripsProxyAndProxyAuth) {
  // Analog of GHSA-6hrp-7fq9-3qv2: redirect to a NO_PROXY-matched host must
  // go direct and must NOT carry Proxy-Authorization.
  std::atomic<int> proxy_hits{0};
  std::atomic<int> target_hits{0};
  std::atomic<bool> target_saw_authz{false};

  no_proxy_test::ScopedServer proxy_mock, target;

  proxy_mock.svr().Get(".*", [&](const Request &, Response &res) {
    proxy_hits++;
    res.status = 302;
    res.set_header("Location", "http://127.0.0.1:" +
                                   std::to_string(target.port()) + "/landed");
  });
  target.svr().Get(".*", [&](const Request &req, Response &res) {
    target_hits++;
    if (req.has_header("Proxy-Authorization")) { target_saw_authz = true; }
    res.set_content("direct", "text/plain");
  });
  proxy_mock.listen();
  target.listen();

  Client cli("public.example", target.port());
  cli.set_hostname_addr_map({{"public.example", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", proxy_mock.port());
  cli.set_proxy_basic_auth("u", "p");
  cli.set_no_proxy({"127.0.0.1"});
  cli.set_follow_location(true);

  auto res = cli.Get("/redir");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_GE(proxy_hits.load(), 1);
  EXPECT_GE(target_hits.load(), 1);
  EXPECT_FALSE(target_saw_authz.load());
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(NoProxyTest, BypassedTargetReturning407DoesNotLeakProxyDigestCredentials) {
  // Direct origin replying 407 must not trigger the digest retry; otherwise
  // proxy creds would be sent to the (possibly hostile) origin.
  std::atomic<int> target_hits{0};
  std::atomic<bool> target_saw_proxy_authz{false};

  no_proxy_test::ScopedServer target;
  target.svr().Get(".*", [&](const Request &req, Response &res) {
    target_hits++;
    if (req.has_header("Proxy-Authorization")) {
      target_saw_proxy_authz = true;
    }
    res.status = StatusCode::ProxyAuthenticationRequired_407;
    res.set_header("Proxy-Authenticate", "Digest realm=\"evil\", qop=\"auth\", "
                                         "nonce=\"abc\", algorithm=MD5");
  });
  target.listen();

  // The proxy address is set to the target's port: the bypass MUST kick in;
  // if it doesn't, the test still routes "via proxy" to the same server and
  // the Proxy-Authorization assertion below catches the leak.
  Client cli("evil.example", target.port());
  cli.set_hostname_addr_map({{"evil.example", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", target.port());
  cli.set_proxy_digest_auth("proxy-user", "proxy-pass");
  cli.set_no_proxy({"evil.example"});

  auto res = cli.Get("/x");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::ProxyAuthenticationRequired_407, res->status);
  EXPECT_EQ(1, target_hits.load());
  EXPECT_FALSE(target_saw_proxy_authz.load());
}
#endif

TEST(NoProxyTest, MultiHopRedirectThroughBypassedHostKeepsProxy) {
  // A (via proxy) → B (NO_PROXY-matched, direct) → C must re-engage the proxy.
  std::atomic<int> proxy_hits{0};
  std::atomic<int> bypass_hits{0};
  std::atomic<bool> proxy_saw_c_url{false};

  no_proxy_test::ScopedServer proxy_mock, bypass_server;

  proxy_mock.svr().Get(".*", [&](const Request &req, Response &res) {
    proxy_hits++;
    if (req.path.find("/start") != std::string::npos) {
      res.status = 302;
      res.set_header("Location", "http://127.0.0.1:" +
                                     std::to_string(bypass_server.port()) +
                                     "/middle");
      return;
    }
    if (req.path.find("/end") != std::string::npos) {
      proxy_saw_c_url = true;
      res.set_content("c-via-proxy", "text/plain");
      return;
    }
    res.set_content("unexpected", "text/plain");
  });
  // public.example's "advertised" port is arbitrary (the request never lands
  // there — it goes through the proxy), but use a dynamic value to stay
  // friendly with sharded parallel runs.
  int public_port = bypass_server.port();
  bypass_server.svr().Get(".*", [&](const Request &, Response &res) {
    bypass_hits++;
    res.status = 302;
    res.set_header("Location", "http://public.example:" +
                                   std::to_string(public_port) + "/end");
  });
  proxy_mock.listen();
  bypass_server.listen();

  Client cli("public.example", public_port);
  cli.set_hostname_addr_map({{"public.example", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", proxy_mock.port());
  cli.set_no_proxy({"127.0.0.1"});
  cli.set_follow_location(true);

  auto res = cli.Get("/start");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::OK_200, res->status);
  EXPECT_EQ("c-via-proxy", res->body);
  EXPECT_GE(proxy_hits.load(), 2);
  EXPECT_GE(bypass_hits.load(), 1);
  EXPECT_TRUE(proxy_saw_c_url.load());
}

TEST(NoProxyTest, KeepAliveSocketInvalidatedOnSetNoProxy) {
  // Mid-session set_no_proxy must drop any keep-alive socket so the next
  // request reconnects to the correct endpoint.
  std::atomic<int> proxy_hits{0};
  std::atomic<int> target_hits{0};

  no_proxy_test::ScopedServer proxy_mock, target;

  proxy_mock.svr().Get(".*", [&](const Request &, Response &res) {
    proxy_hits++;
    res.set_content("via-proxy", "text/plain");
  });
  target.svr().Get(".*", [&](const Request &, Response &res) {
    target_hits++;
    res.set_content("direct", "text/plain");
  });
  proxy_mock.listen();
  target.listen();

  Client cli("public.example", target.port());
  cli.set_hostname_addr_map({{"public.example", "127.0.0.1"}});
  cli.set_proxy("127.0.0.1", proxy_mock.port());
  cli.set_keep_alive(true);

  auto res1 = cli.Get("/a");
  ASSERT_TRUE(res1);
  EXPECT_EQ("via-proxy", res1->body);
  EXPECT_EQ(1, proxy_hits.load());
  EXPECT_EQ(0, target_hits.load());

  cli.set_no_proxy({"public.example"});

  auto res2 = cli.Get("/b");
  ASSERT_TRUE(res2);
  EXPECT_EQ("direct", res2->body);
  EXPECT_EQ(1, proxy_hits.load());
  EXPECT_EQ(1, target_hits.load());
}

// Forward declarations (see the base64_encode note).
namespace httplib {
namespace detail {
ssize_t select_read(socket_t sock, time_t sec, time_t usec);
int shutdown_socket(socket_t sock) noexcept;
} // namespace detail
} // namespace httplib

namespace proxy_tunnel_test {

const char *const kTunnelEstablished =
    "HTTP/1.1 200 Connection established\r\n\r\n";

// Answers the head of a CONNECT request; a 200 opens the tunnel.
using ConnectReply = std::function<std::string(const std::string &head)>;

// Accepts CONNECT on 127.0.0.1, answers it with `reply` (200 by default) and,
// once tunnelled, byte-forwards to 127.0.0.1:forward_port.
class ScopedConnectProxy {
public:
  explicit ScopedConnectProxy(int forward_port, ConnectReply reply = nullptr)
      : forward_port_(forward_port), reply_(std::move(reply)) {
    listen_sock_ = ::socket(AF_INET, SOCK_STREAM, 0);
    if (listen_sock_ == INVALID_SOCKET) { return; }
    auto a = loopback(0);
    auto addr = reinterpret_cast<sockaddr *>(&a);
    socklen_t alen = sizeof(a);
    if (::bind(listen_sock_, addr, sizeof(a)) != 0 ||
        ::getsockname(listen_sock_, addr, &alen) != 0 ||
        ::listen(listen_sock_, 4) != 0) {
      return;
    }
    port_ = ntohs(a.sin_port);
    th_ = std::thread([this] { run(); });
  }

  ~ScopedConnectProxy() {
    if (th_.joinable()) {
      stop_ = true;
      auto wake = connect_to(port_);
      th_.join();
      if (wake != INVALID_SOCKET) { detail::close_socket(wake); }
    }
    if (listen_sock_ != INVALID_SOCKET) { detail::close_socket(listen_sock_); }
  }

  int port() const { return port_; }
  int connect_hits() const { return connect_hits_.load(); }
  // Head of the last CONNECT request, as the proxy saw it on the wire.
  std::string connect_request() const {
    std::lock_guard<std::mutex> lock(connect_request_mutex_);
    return connect_request_;
  }

private:
  static sockaddr_in loopback(int port) {
    sockaddr_in a{};
    a.sin_family = AF_INET;
    a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    a.sin_port = htons(static_cast<unsigned short>(port));
    return a;
  }

  static socket_t connect_to(int port) {
    auto sock = ::socket(AF_INET, SOCK_STREAM, 0);
    if (sock == INVALID_SOCKET) { return sock; }
    auto a = loopback(port);
    if (::connect(sock, reinterpret_cast<sockaddr *>(&a), sizeof(a)) != 0) {
      detail::close_socket(sock);
      return INVALID_SOCKET;
    }
    return sock;
  }

  static bool send_all(socket_t sock, const char *data, size_t size) {
    while (size > 0) {
      auto n = detail::send_socket(sock, data, size, 0);
      if (n <= 0) { return false; }
      data += n;
      size -= static_cast<size_t>(n);
    }
    return true;
  }

  void run() {
    for (;;) {
      auto client = ::accept(listen_sock_, nullptr, nullptr);
      if (stop_) {
        if (client != INVALID_SOCKET) { detail::close_socket(client); }
        return;
      }
      if (client == INVALID_SOCKET) { continue; }
      serve(client);
      detail::close_socket(client);
    }
  }

  void serve(socket_t client) {
    std::string head;
    char buf[2048];
    while (head.find("\r\n\r\n") == std::string::npos) {
      if (detail::select_read(client, 5, 0) <= 0) { return; }
      auto n = detail::read_socket(client, buf, sizeof(buf), 0);
      if (n <= 0) { return; }
      head.append(buf, static_cast<size_t>(n));
    }
    if (head.compare(0, 8, "CONNECT ") != 0) { return; }
    connect_hits_++;
    {
      std::lock_guard<std::mutex> lock(connect_request_mutex_);
      connect_request_ = head;
    }

    auto res = reply_ ? reply_(head) : std::string(kTunnelEstablished);
    if (!send_all(client, res.data(), res.size()) ||
        res.compare(0, 12, "HTTP/1.1 200") != 0) {
      return;
    }

    auto origin = connect_to(forward_port_);
    if (origin == INVALID_SOCKET) { return; }

    // When either side stops, shut both down so the other pump returns too.
    auto pump = [&](socket_t from, socket_t to) {
      char b[8192];
      for (;;) {
        auto n = detail::read_socket(from, b, sizeof(b), 0);
        if (n <= 0 || !send_all(to, b, static_cast<size_t>(n))) { break; }
      }
      detail::shutdown_socket(client);
      detail::shutdown_socket(origin);
    };
    std::thread up([&] { pump(client, origin); });
    pump(origin, client);
    up.join();
    detail::close_socket(origin);
  }

  int forward_port_;
  ConnectReply reply_;
  socket_t listen_sock_ = INVALID_SOCKET;
  int port_ = 0;
  std::thread th_;
  std::atomic<bool> stop_{false};
  std::atomic<int> connect_hits_{0};
  mutable std::mutex connect_request_mutex_;
  std::string connect_request_;
};

} // namespace proxy_tunnel_test

#ifdef CPPHTTPLIB_SSL_ENABLED
namespace proxy_tunnel_test {

// SSLServer counterpart to no_proxy_test::ScopedServer.
class ScopedSSLServer {
public:
  ScopedSSLServer() : svr_(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE) {
    port_ = svr_.bind_to_any_port("127.0.0.1");
  }
  ~ScopedSSLServer() {
    svr_.stop();
    if (th_.joinable()) { th_.join(); }
  }
  SSLServer &svr() { return svr_; }
  int port() const { return port_; }
  void listen() {
    th_ = std::thread([this] { svr_.listen_after_bind(); });
    svr_.wait_until_ready();
  }

private:
  SSLServer svr_;
  std::thread th_;
  int port_ = 0;
};

// Sends one request through the CONNECT proxy to the TLS origin with a
// credential configured for each hop, and checks that each credential reaches
// only the hop it was configured for: the proxy's on the CONNECT request, the
// origin's (every header in origin_headers) on the tunnelled request.
void CredentialsStayWithTheirHop(
    const std::function<void(SSLClient &)> &set_credentials,
    const std::string &scheme,
    const std::vector<std::string> &origin_headers = {"Authorization"},
    bool stream = false) {
  std::atomic<int> origin_hits{0};
  std::atomic<bool> origin_saw_proxy_authz{false};
  std::atomic<bool> origin_saw_headers{false};

  ScopedSSLServer origin;
  origin.svr().Get(".*", [&](const Request &req, Response &res) {
    origin_hits++;
    origin_saw_proxy_authz = req.has_header("Proxy-Authorization");
    origin_saw_headers =
        std::all_of(origin_headers.begin(), origin_headers.end(),
                    [&](const std::string &h) { return req.has_header(h); });
    res.set_content("ok", "text/plain");
  });
  origin.listen();

  ScopedConnectProxy proxy(origin.port());
  ASSERT_NE(0, proxy.port());

  // Pinned to 127.0.0.1 for the same reason as the test below.
  SSLClient cli("127.0.0.1", origin.port());
  cli.enable_server_certificate_verification(false);
  cli.set_proxy("127.0.0.1", proxy.port());
  set_credentials(cli);

  if (stream) {
    auto handle = cli.open_stream("GET", "/x");
    ASSERT_TRUE(handle.is_valid()) << "Error: " << to_string(handle.error);
    EXPECT_EQ(StatusCode::OK_200, handle.response->status);
  } else {
    auto res = cli.Get("/x");
    ASSERT_TRUE(res) << "Error: " << to_string(res.error());
    EXPECT_EQ(StatusCode::OK_200, res->status);
  }
  EXPECT_EQ(1, origin_hits.load());
  EXPECT_EQ(1, proxy.connect_hits());

  EXPECT_TRUE(origin_saw_headers.load());
  EXPECT_FALSE(origin_saw_proxy_authz.load())
      << "Proxy-Authorization must not be sent inside the tunnel";

  auto connect_req = proxy.connect_request();
  EXPECT_NE(std::string::npos,
            connect_req.find("\r\nProxy-Authorization: " + scheme + " "));
  for (const auto &h : origin_headers) {
    EXPECT_EQ(std::string::npos, connect_req.find("\r\n" + h + ": "))
        << h << " must not be sent to the proxy on CONNECT";
  }
}

} // namespace proxy_tunnel_test

TEST(ProxyTunnelTest, BasicCredentialsStayWithTheirHop) {
  proxy_tunnel_test::CredentialsStayWithTheirHop(
      [](SSLClient &cli) {
        cli.set_proxy_basic_auth("proxy-user", "proxy-pass");
        cli.set_basic_auth("origin-user", "origin-pass");
      },
      "Basic");
}

TEST(ProxyTunnelTest, StreamCredentialsStayWithTheirHop) {
  proxy_tunnel_test::CredentialsStayWithTheirHop(
      [](SSLClient &cli) {
        cli.set_proxy_basic_auth("proxy-user", "proxy-pass");
        cli.set_basic_auth("origin-user", "origin-pass");
      },
      "Basic", {"Authorization"}, true);
}

TEST(ProxyTunnelTest, BearerCredentialsStayWithTheirHop) {
  proxy_tunnel_test::CredentialsStayWithTheirHop(
      [](SSLClient &cli) {
        cli.set_proxy_bearer_token_auth("proxy-token");
        cli.set_bearer_token_auth("origin-token");
      },
      "Bearer");
}

TEST(ProxyTunnelTest, DefaultHeadersStayOffConnect) {
  proxy_tunnel_test::CredentialsStayWithTheirHop(
      [](SSLClient &cli) {
        cli.set_proxy_basic_auth("proxy-user", "proxy-pass");
        cli.set_default_headers({{"Authorization", "Bearer origin-token"},
                                 {"Cookie", "sid=origin-session"},
                                 {"X-Api-Key", "origin-key"}});
      },
      "Basic", {"Authorization", "Cookie", "X-Api-Key"});
}

TEST(ProxyTunnelTest, OriginReturning407InsideTunnelDoesNotLeakProxyDigest) {
  // Origin inside a CONNECT tunnel replying 407 must not trigger the digest
  // retry; otherwise proxy creds would be sent to the origin.
  std::atomic<int> origin_hits{0};
  std::atomic<bool> origin_saw_proxy_authz{false};

  proxy_tunnel_test::ScopedSSLServer origin;
  origin.svr().Get(".*", [&](const Request &req, Response &res) {
    origin_hits++;
    if (req.has_header("Proxy-Authorization")) {
      origin_saw_proxy_authz = true;
    }
    res.status = StatusCode::ProxyAuthenticationRequired_407;
    res.set_header("Proxy-Authenticate",
                   "Digest realm=\"evil\", qop=\"auth\", nonce=\"abc\", "
                   "algorithm=MD5");
  });
  origin.listen();

  proxy_tunnel_test::ScopedConnectProxy proxy(origin.port());
  ASSERT_NE(0, proxy.port());

  // Pin to 127.0.0.1: the proxy listens on 127.0.0.1 only, while "localhost"
  // may resolve to ::1 first. A concurrent test (e.g. another gtest shard)
  // holding ::1 with the same ephemeral port number would hijack the CONNECT
  // and answer with its own status, making this test flaky.
  SSLClient cli("127.0.0.1", origin.port());
  cli.enable_server_certificate_verification(false);
  cli.set_proxy("127.0.0.1", proxy.port());
  cli.set_proxy_digest_auth("proxy-user", "proxy-pass");

  auto res = cli.Get("/x");
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  EXPECT_EQ(StatusCode::ProxyAuthenticationRequired_407, res->status);
  EXPECT_EQ(1, origin_hits.load());
  EXPECT_FALSE(origin_saw_proxy_authz.load());
  EXPECT_EQ(1, proxy.connect_hits());
}
#endif

namespace proxy_tunnel_test {

// Tunnels only a CONNECT carrying `expected` as its Proxy-Authorization;
// anything else gets a 407 with `challenge`.
ConnectReply require_proxy_auth(const std::string &expected,
                                const std::string &challenge) {
  return [=](const std::string &head) -> std::string {
    if (head.find("\r\nProxy-Authorization: " + expected + "\r\n") !=
        std::string::npos) {
      return kTunnelEstablished;
    }
    return "HTTP/1.1 407 Proxy Authentication Required\r\n"
           "Proxy-Authenticate: " +
           challenge + "\r\nContent-Length: 0\r\n\r\n";
  };
}

// Reports the Authorization and Proxy-Authorization headers of the upgrade
// request, then echoes.
void report_auth_then_echo(const Request &req, ws::WebSocket &ws) {
  ws.send(
      "authorization:" + req.get_header_value("Authorization") +
      "|proxy-authorization:" + req.get_header_value("Proxy-Authorization"));
  std::string msg;
  while (ws.read(msg)) {
    ws.send(msg);
  }
}

// A WebSocket origin on 127.0.0.1 serving report_auth_then_echo at /ws.
class ScopedWebSocketOrigin {
public:
  ScopedWebSocketOrigin() {
    server_.svr().WebSocket("/ws", report_auth_then_echo);
    server_.listen();
  }

  int port() const { return server_.port(); }
  // Pinned to 127.0.0.1, the only address the proxy forwards to.
  std::string url() const {
    return "ws://127.0.0.1:" + std::to_string(port()) + "/ws";
  }

private:
  no_proxy_test::ScopedServer server_;
};

// Connects through a proxy that requires `proxy_authz`, with `origin_authz`
// passed as a constructor header, and checks that each reaches only its hop.
void WebSocketCredentialsStayWithTheirHop(
    const std::function<void(ws::WebSocketClient &)> &set_proxy_credentials,
    const std::string &proxy_authz, const std::string &origin_authz) {
  ScopedWebSocketOrigin origin;
  ScopedConnectProxy proxy(
      origin.port(), require_proxy_auth(proxy_authz, "Basic realm=\"proxy\""));
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url(), {{"Authorization", origin_authz}});
  client.set_proxy("127.0.0.1", proxy.port());
  set_proxy_credentials(client);
  auto res = client.connect();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("authorization:" + origin_authz + "|proxy-authorization:", msg);
  client.close();

  EXPECT_EQ(1, proxy.connect_hits());
  EXPECT_EQ(std::string::npos,
            proxy.connect_request().find("\r\nAuthorization: "))
      << "origin credentials must not be sent to the proxy";
}

} // namespace proxy_tunnel_test

TEST(WebSocketProxyTest, TunnelsThroughConnect) {
  proxy_tunnel_test::ScopedWebSocketOrigin origin;
  proxy_tunnel_test::ScopedConnectProxy proxy(origin.port());
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url());
  client.set_proxy("127.0.0.1", proxy.port());
  auto res = client.connect();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  ASSERT_TRUE(client.send("hello"));
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("hello", msg);
  client.close();

  EXPECT_EQ(1, proxy.connect_hits());
  auto target = "127.0.0.1:" + std::to_string(origin.port());
  auto connect_req = proxy.connect_request();
  EXPECT_EQ(0u, connect_req.find("CONNECT " + target + " HTTP/1.1\r\n"));
  EXPECT_NE(std::string::npos,
            connect_req.find("\r\nHost: " + target + "\r\n"));
}

TEST(WebSocketProxyTest, BasicCredentialsStayWithTheirHop) {
  proxy_tunnel_test::WebSocketCredentialsStayWithTheirHop(
      [](ws::WebSocketClient &cli) {
        cli.set_proxy_basic_auth("proxy-user", "proxy-pass");
      },
      "Basic " + detail::base64_encode("proxy-user:proxy-pass"),
      "Basic " + detail::base64_encode("origin-user:origin-pass"));
}

TEST(WebSocketProxyTest, BearerCredentialsStayWithTheirHop) {
  proxy_tunnel_test::WebSocketCredentialsStayWithTheirHop(
      [](ws::WebSocketClient &cli) {
        cli.set_proxy_bearer_token_auth("proxy-token");
      },
      "Bearer proxy-token", "Bearer origin-token");
}

TEST(WebSocketProxyTest, BasicCredentialsWithEmptyPasswordAreSent) {
  proxy_tunnel_test::ScopedWebSocketOrigin origin;
  proxy_tunnel_test::ScopedConnectProxy proxy(
      origin.port(), proxy_tunnel_test::require_proxy_auth(
                         "Basic " + detail::base64_encode("proxy-user:"),
                         "Basic realm=\"proxy\""));
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url());
  client.set_proxy("127.0.0.1", proxy.port());
  client.set_proxy_basic_auth("proxy-user", "");
  auto res = client.connect();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());
  client.close();

  EXPECT_EQ(1, proxy.connect_hits());
}

TEST(WebSocketProxyTest, ProxyRejectionReportsProxyConnection) {
  proxy_tunnel_test::ScopedWebSocketOrigin origin;
  proxy_tunnel_test::ScopedConnectProxy proxy(
      origin.port(), proxy_tunnel_test::require_proxy_auth(
                         "Bearer proxy-token", "Basic realm=\"proxy\""));
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url());
  client.set_proxy("127.0.0.1", proxy.port());
  auto res = client.connect();
  EXPECT_FALSE(res);
  EXPECT_EQ(Error::ProxyConnection, res.error());
  EXPECT_EQ(StatusCode::ProxyAuthenticationRequired_407, res.status());
  EXPECT_EQ("Basic realm=\"proxy\"",
            res.get_header_value("Proxy-Authenticate"));
  EXPECT_FALSE(client.is_open());
}

TEST(WebSocketProxyTest, NoProxyBypassesProxy) {
  proxy_tunnel_test::ScopedWebSocketOrigin origin;
  proxy_tunnel_test::ScopedConnectProxy proxy(origin.port());
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url());
  client.set_proxy("127.0.0.1", proxy.port());
  client.set_proxy_basic_auth("proxy-user", "proxy-pass");
  client.set_no_proxy({"127.0.0.1"});
  auto res = client.connect();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("authorization:|proxy-authorization:", msg)
      << "proxy credentials must not reach a bypassed origin";
  client.close();

  EXPECT_EQ(0, proxy.connect_hits());
}

TEST(WebSocketProxyTest, ProxySettingAppliesOnReconnect) {
  proxy_tunnel_test::ScopedWebSocketOrigin origin;
  proxy_tunnel_test::ScopedConnectProxy proxy(origin.port());
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url());
  client.set_proxy("127.0.0.1", proxy.port());
  ASSERT_TRUE(client.connect());
  ASSERT_TRUE(client.connect());
  client.close();

  EXPECT_EQ(2, proxy.connect_hits());
}

#ifdef CPPHTTPLIB_SSL_ENABLED
TEST(WebSocketProxyTest, DigestRetriesConnectOnFreshSocket) {
  proxy_tunnel_test::ScopedWebSocketOrigin origin;
  proxy_tunnel_test::ScopedConnectProxy proxy(
      origin.port(), [](const std::string &head) -> std::string {
        if (head.find(
                "\r\nProxy-Authorization: Digest username=\"proxy-user\"") !=
            std::string::npos) {
          return proxy_tunnel_test::kTunnelEstablished;
        }
        return "HTTP/1.1 407 Proxy Authentication Required\r\n"
               "Proxy-Authenticate: Digest realm=\"proxy\", qop=\"auth\", "
               "nonce=\"abc\", algorithm=MD5\r\n"
               "Content-Length: 0\r\n\r\n";
      });
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(origin.url());
  client.set_proxy("127.0.0.1", proxy.port());
  client.set_proxy_digest_auth("proxy-user", "proxy-pass");
  auto res = client.connect();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("authorization:|proxy-authorization:", msg);
  client.close();

  EXPECT_EQ(2, proxy.connect_hits());
}

TEST(WebSocketProxyTest, WssTunnelsThroughConnect) {
  proxy_tunnel_test::ScopedSSLServer origin;
  origin.svr().WebSocket("/ws", proxy_tunnel_test::report_auth_then_echo);
  origin.listen();

  proxy_tunnel_test::ScopedConnectProxy proxy(
      origin.port(), proxy_tunnel_test::require_proxy_auth(
                         "Bearer proxy-token", "Bearer realm=\"proxy\""));
  ASSERT_NE(0, proxy.port());

  ws::WebSocketClient client(
      "wss://127.0.0.1:" + std::to_string(origin.port()) + "/ws");
  client.enable_server_certificate_verification(false);
  client.set_proxy("127.0.0.1", proxy.port());
  client.set_proxy_bearer_token_auth("proxy-token");
  auto res = client.connect();
  ASSERT_TRUE(res) << "Error: " << to_string(res.error());

  std::string msg;
  ASSERT_TRUE(client.read(msg));
  EXPECT_EQ("authorization:|proxy-authorization:", msg)
      << "Proxy-Authorization must not be sent inside the tunnel";
  client.close();

  EXPECT_EQ(1, proxy.connect_hits());
}
#endif