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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-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#6699cc;">curl</span><span style="color:#f2777a;"> -LO</span><span style="color:#d3d0c8;"> https://github.com/yhirose/cpp-httplib/raw/refs/tags/latest/httplib.h
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#8fa1b3;">curl</span><span style="color:#bf616a;"> -LO</span><span style="color:#4f5b66;"> https://github.com/yhirose/cpp-httplib/raw/refs/tags/latest/httplib.h
</span></pre>
</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-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&quot;</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">&quot;
</span><span style="color:#d3d0c8;">
</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
</span><span style="color:#d3d0c8;"> httplib::Server svr;
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">Get</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">&quot;, [](</span><span style="color:#cc99cc;">const</span><span style="color:#d3d0c8;"> httplib::Request&amp;, httplib::Response&amp; res) {
</span><span style="color:#d3d0c8;"> res.</span><span style="color:#6699cc;">set_content</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">Hello, World!</span><span style="color:#d3d0c8;">&quot;, &quot;</span><span style="color:#99cc99;">text/plain</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;"> });
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">listen</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">0.0.0.0</span><span style="color:#d3d0c8;">&quot;, </span><span style="color:#f99157;">8080</span><span style="color:#d3d0c8;">);
</span><span style="color:#d3d0c8;">}
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#4f5b66;">&quot;
</span><span style="color:#4f5b66;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#4f5b66;">() {
</span><span style="color:#4f5b66;"> httplib::Server svr;
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#4f5b66;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#4f5b66;"> httplib::Request&amp;, httplib::Response&amp; res) {
</span><span style="color:#4f5b66;"> res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">Hello, World!</span><span style="color:#4f5b66;">&quot;, &quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;"> });
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> svr.</span><span style="color:#8fa1b3;">listen</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">0.0.0.0</span><span style="color:#4f5b66;">&quot;, </span><span style="color:#d08770;">8080</span><span style="color:#4f5b66;">);
</span><span style="color:#4f5b66;">}
</span></pre>
</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-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#747369;"># macOS
</span><span style="color:#6699cc;">clang++</span><span style="color:#f2777a;"> -std</span><span style="color:#d3d0c8;">=c++17</span><span style="color:#f2777a;"> -o</span><span style="color:#d3d0c8;"> server server.cpp
</span><span style="color:#d3d0c8;">
</span><span style="color:#747369;"># Linux
</span><span style="color:#747369;"># `-pthread`: cpp-httplib uses threads internally
</span><span style="color:#6699cc;">clang++</span><span style="color:#f2777a;"> -std</span><span style="color:#d3d0c8;">=c++17</span><span style="color:#f2777a;"> -pthread -o</span><span style="color:#d3d0c8;"> server server.cpp
</span><span style="color:#d3d0c8;">
</span><span style="color:#747369;"># Windows (Developer Command Prompt)
</span><span style="color:#747369;"># `/EHsc`: Enable C++ exception handling
</span><span style="color:#6699cc;">cl</span><span style="color:#d3d0c8;"> /EHsc /std:c++17 server.cpp
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#a7adba;"># macOS
</span><span style="color:#8fa1b3;">clang++</span><span style="color:#bf616a;"> -std</span><span style="color:#4f5b66;">=c++17</span><span style="color:#bf616a;"> -o</span><span style="color:#4f5b66;"> server server.cpp
</span><span style="color:#4f5b66;">
</span><span style="color:#a7adba;"># Linux
</span><span style="color:#a7adba;"># `-pthread`: cpp-httplib uses threads internally
</span><span style="color:#8fa1b3;">clang++</span><span style="color:#bf616a;"> -std</span><span style="color:#4f5b66;">=c++17</span><span style="color:#bf616a;"> -pthread -o</span><span style="color:#4f5b66;"> server server.cpp
</span><span style="color:#4f5b66;">
</span><span style="color:#a7adba;"># Windows (Developer Command Prompt)
</span><span style="color:#a7adba;"># `/EHsc`: Enable C++ exception handling
</span><span style="color:#8fa1b3;">cl</span><span style="color:#4f5b66;"> /EHsc /std:c++17 server.cpp
</span></pre>
</div>
<p>Once it compiles, run it.</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#747369;"># macOS / Linux
</span><span style="color:#6699cc;">./server
</span><span style="color:#d3d0c8;">
</span><span style="color:#747369;"># Windows
</span><span style="color:#6699cc;">server.exe
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#a7adba;"># macOS / Linux
</span><span style="color:#8fa1b3;">./server
</span><span style="color:#4f5b66;">
</span><span style="color:#a7adba;"># Windows
</span><span style="color:#8fa1b3;">server.exe
</span></pre>
</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-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#6699cc;">curl</span><span style="color:#d3d0c8;"> http://localhost:8080/
</span><span style="color:#747369;"># Hello, World!
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#8fa1b3;">curl</span><span style="color:#4f5b66;"> http://localhost:8080/
</span><span style="color:#a7adba;"># Hello, World!
</span></pre>
</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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