Add SSL support for proxy connections in open_stream and corresponding test

README-stream.md

@@ -45,7 +45,7 @@ cpp-httplib provides multiple API layers for different use cases:
 
 ```text
 ┌─────────────────────────────────────────────┐
-│  SSEClient (planned)                        │  ← SSE-specific, parsed events
+│  SSEClient                        │  ← SSE-specific, parsed events
 │  - on_message(), on_event()                 │
 │  - Auto-reconnect, Last-Event-ID            │
 ├─────────────────────────────────────────────┤
@@ -61,7 +61,7 @@ cpp-httplib provides multiple API layers for different use cases:
 
 | Use Case | Recommended API |
 |----------|----------------|
-| SSE with auto-reconnect | SSEClient (planned) or `ssecli-stream.cc` example |
+| SSE with auto-reconnect | `SSEClient` (see [README-sse.md](README-sse.md)) |
 | LLM streaming (JSON Lines) | `stream::Get()` |
 | Large file download | `stream::Get()` or `open_stream()` |
 | Reverse proxy | `open_stream()` |

httplib.h

@@ -12413,6 +12413,7 @@ ClientImpl::open_stream(const std::string &method, const std::string &path,
   handle.response = detail::make_unique<Response>();
   handle.error = Error::Success;
 
+  auto start_time = std::chrono::steady_clock::now();
   auto query_path = params.empty() ? path : append_query_params(path, params);
   handle.connection_ = detail::make_unique<ClientConnection>();
 
@@ -12446,6 +12447,13 @@ ClientImpl::open_stream(const std::string &method, const std::string &path,
       if (is_ssl()) {
         auto &scli = static_cast<SSLClient &>(*this);
         if (!proxy_host_.empty() && proxy_port_ != -1) {
+          auto success = false;
+          if (!scli.connect_with_proxy(socket_, start_time, *handle.response,
+                                       success, handle.error)) {
+            if (!success) { handle.response.reset(); }
+            return handle;
+          }
+
           if (!scli.initialize_ssl(socket_, handle.error)) {
             handle.response.reset();
             return handle;

test/test_proxy.cc

@@ -344,3 +344,25 @@ TEST(KeepAliveTest, SSLWithDigest) {
   KeepAliveTest(cli, false);
 }
 #endif
+
+// ----------------------------------------------------------------------------
+
+#ifdef CPPHTTPLIB_SSL_ENABLED
+TEST(ProxyTest, SSLOpenStream) {
+  SSLClient cli("nghttp2.org");
+  cli.set_proxy("localhost", 3128);
+  cli.set_proxy_basic_auth("hello", "world");
+
+  auto handle = cli.open_stream("GET", "/httpbin/get");
+  ASSERT_TRUE(handle.response);
+  EXPECT_EQ(StatusCode::OK_200, handle.response->status);
+
+  std::string body;
+  char buf[8192];
+  ssize_t n;
+  while ((n = handle.read(buf, sizeof(buf))) > 0) {
+    body.append(buf, static_cast<size_t>(n));
+  }
+  EXPECT_FALSE(body.empty());
+}
+#endif