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cpp-httplib
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      <a href="&#x2F;cpp-httplib&#x2F;en/" class="header-title">cpp-httplib <span style="font-size:0.75em;font-weight:normal;margin-left:4px">v0.36.0</span></a>
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    <h1>Getting Started</h1>
    <p>All you need to get started with cpp-httplib is <code>httplib.h</code> and a C++ compiler. Let's download the file and get a Hello World server running.</p>
<h2>Getting httplib.h</h2>
<p>You can download it directly from GitHub. Always use the latest version.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#8fa1b3;">curl</span><span style="color:#bf616a;"> -LO</span><span style="color:#c0c5ce;"> https://github.com/yhirose/cpp-httplib/raw/refs/tags/latest/httplib.h
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">curl -LO https://github.com/yhirose/cpp-httplib/raw/refs/tags/latest/httplib.h
</span></pre>
</div></div>
<p>Place the downloaded <code>httplib.h</code> in your project directory and you're good to go.</p>
<h2>Setting Up Your Compiler</h2>
<table><thead><tr><th>OS</th><th>Development Environment</th><th>Setup</th></tr></thead><tbody>
<tr><td>macOS</td><td>Apple Clang</td><td>Xcode Command Line Tools (<code>xcode-select --install</code>)</td></tr>
<tr><td>Ubuntu</td><td>clang++ or g++</td><td><code>apt install clang</code> or <code>apt install g++</code></td></tr>
<tr><td>Windows</td><td>MSVC</td><td>Visual Studio 2022 or later (install with C++ components)</td></tr>
</tbody></table>
<h2>Hello World Server</h2>
<p>Save the following code as <code>server.cpp</code>.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#c0c5ce;">&quot;
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#c0c5ce;">() {
</span><span style="color:#c0c5ce;">    httplib::Server svr;
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">    svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#c0c5ce;"> httplib::Request&amp;, httplib::Response&amp; res) {
</span><span style="color:#c0c5ce;">        res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">Hello, World!</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">    });
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;">    svr.</span><span style="color:#8fa1b3;">listen</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">0.0.0.0</span><span style="color:#c0c5ce;">&quot;, </span><span style="color:#d08770;">8080</span><span style="color:#c0c5ce;">);
</span><span style="color:#c0c5ce;">}
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&quot;httplib.h&quot;
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
</span><span style="color:#323232;">    httplib::Server svr;
</span><span style="color:#323232;">
</span><span style="color:#323232;">    svr.Get(</span><span style="color:#183691;">&quot;/&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const</span><span style="color:#323232;"> httplib::Request</span><span style="font-weight:bold;color:#a71d5d;">&amp;</span><span style="color:#323232;">, httplib::Response</span><span style="font-weight:bold;color:#a71d5d;">&amp;</span><span style="color:#323232;"> res) {
</span><span style="color:#323232;">        res.set_content(</span><span style="color:#183691;">&quot;Hello, World!&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;text/plain&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">    });
</span><span style="color:#323232;">
</span><span style="color:#323232;">    svr.listen(</span><span style="color:#183691;">&quot;0.0.0.0&quot;</span><span style="color:#323232;">, </span><span style="color:#0086b3;">8080</span><span style="color:#323232;">);
</span><span style="color:#323232;">}
</span></pre>
</div></div>
<p>In just a few lines, you have a server that responds to HTTP requests.</p>
<h2>Compiling and Running</h2>
<p>The sample code in this tutorial is written in C++17 for cleaner, more concise code. cpp-httplib itself can compile with C++11 as well.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#65737e;"># macOS
</span><span style="color:#8fa1b3;">clang++</span><span style="color:#bf616a;"> -std</span><span style="color:#c0c5ce;">=c++17</span><span style="color:#bf616a;"> -o</span><span style="color:#c0c5ce;"> server server.cpp
</span><span style="color:#c0c5ce;">
</span><span style="color:#65737e;"># Linux
</span><span style="color:#65737e;"># `-pthread`: cpp-httplib uses threads internally
</span><span style="color:#8fa1b3;">clang++</span><span style="color:#bf616a;"> -std</span><span style="color:#c0c5ce;">=c++17</span><span style="color:#bf616a;"> -pthread -o</span><span style="color:#c0c5ce;"> server server.cpp
</span><span style="color:#c0c5ce;">
</span><span style="color:#65737e;"># Windows (Developer Command Prompt)
</span><span style="color:#65737e;"># `/EHsc`: Enable C++ exception handling
</span><span style="color:#8fa1b3;">cl</span><span style="color:#c0c5ce;"> /EHsc /std:c++17 server.cpp
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-style:italic;color:#969896;"># macOS
</span><span style="color:#323232;">clang++ -std</span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#323232;">c++17 -o server server.cpp
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;"># Linux
</span><span style="font-style:italic;color:#969896;"># `-pthread`: cpp-httplib uses threads internally
</span><span style="color:#323232;">clang++ -std</span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#323232;">c++17 -pthread -o server server.cpp
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;"># Windows (Developer Command Prompt)
</span><span style="font-style:italic;color:#969896;"># `/EHsc`: Enable C++ exception handling
</span><span style="color:#323232;">cl /EHsc /std:c++17 server.cpp
</span></pre>
</div></div>
<p>Once it compiles, run it.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#65737e;"># macOS / Linux
</span><span style="color:#8fa1b3;">./server
</span><span style="color:#c0c5ce;">
</span><span style="color:#65737e;"># Windows
</span><span style="color:#8fa1b3;">server.exe
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-style:italic;color:#969896;"># macOS / Linux
</span><span style="color:#323232;">./server
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;"># Windows
</span><span style="color:#323232;">server.exe
</span></pre>
</div></div>
<p>Open <code>http://localhost:8080</code> in your browser. If you see "Hello, World!", you're all set.</p>
<p>You can also verify with <code>curl</code>.</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#8fa1b3;">curl</span><span style="color:#c0c5ce;"> http://localhost:8080/
</span><span style="color:#65737e;"># Hello, World!
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">curl http://localhost:8080/
</span><span style="font-style:italic;color:#969896;"># Hello, World!
</span></pre>
</div></div>
<p>To stop the server, press <code>Ctrl+C</code> in your terminal.</p>
<h2>Next Steps</h2>
<p>Now you know the basics of running a server. Next, let's look at the client side. cpp-httplib also comes with HTTP client functionality.</p>
<p><strong>Next:</strong> <a href="../02-basic-client">Basic Client</a></p>

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