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  19. <a href="&#x2F;cpp-httplib/en/" class="header-title">cpp-httplib <span style="font-size:0.75em;font-weight:normal;margin-left:4px">v0.35.0</span></a>
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  44. <li><a href="&#x2F;cpp-httplib&#x2F;en&#x2F;tour&#x2F;01-getting-started&#x2F;" class="active">Getting Started</a></li>
  45. <li><a href="&#x2F;cpp-httplib&#x2F;en&#x2F;tour&#x2F;02-basic-client&#x2F;" class="">Basic Client</a></li>
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  58. <article>
  59. <h1>Getting Started</h1>
  60. <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>
  61. <h2>Getting httplib.h</h2>
  62. <p>You can download it directly from GitHub. Always use the latest version.</p>
  63. <div class="code-dark"><pre style="background-color:#2d2d2d;">
  64. <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
  65. </span></pre>
  66. </div><div class="code-light"><pre style="background-color:#eff1f5;">
  67. <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
  68. </span></pre>
  69. </div>
  70. <p>Place the downloaded <code>httplib.h</code> in your project directory and you're good to go.</p>
  71. <h2>Setting Up Your Compiler</h2>
  72. <table><thead><tr><th>OS</th><th>Development Environment</th><th>Setup</th></tr></thead><tbody>
  73. <tr><td>macOS</td><td>Apple Clang</td><td>Xcode Command Line Tools (<code>xcode-select --install</code>)</td></tr>
  74. <tr><td>Ubuntu</td><td>clang++ or g++</td><td><code>apt install clang</code> or <code>apt install g++</code></td></tr>
  75. <tr><td>Windows</td><td>MSVC</td><td>Visual Studio 2022 or later (install with C++ components)</td></tr>
  76. </tbody></table>
  77. <h2>Hello World Server</h2>
  78. <p>Save the following code as <code>server.cpp</code>.</p>
  79. <div class="code-dark"><pre style="background-color:#2d2d2d;">
  80. <span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">&quot;</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">&quot;
  81. </span><span style="color:#d3d0c8;">
  82. </span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
  83. </span><span style="color:#d3d0c8;"> httplib::Server svr;
  84. </span><span style="color:#d3d0c8;">
  85. </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) {
  86. </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;);
  87. </span><span style="color:#d3d0c8;"> });
  88. </span><span style="color:#d3d0c8;">
  89. </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;">);
  90. </span><span style="color:#d3d0c8;">}
  91. </span></pre>
  92. </div><div class="code-light"><pre style="background-color:#eff1f5;">
  93. <span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#4f5b66;">&quot;
  94. </span><span style="color:#4f5b66;">
  95. </span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#4f5b66;">() {
  96. </span><span style="color:#4f5b66;"> httplib::Server svr;
  97. </span><span style="color:#4f5b66;">
  98. </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) {
  99. </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;);
  100. </span><span style="color:#4f5b66;"> });
  101. </span><span style="color:#4f5b66;">
  102. </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;">);
  103. </span><span style="color:#4f5b66;">}
  104. </span></pre>
  105. </div>
  106. <p>In just a few lines, you have a server that responds to HTTP requests.</p>
  107. <h2>Compiling and Running</h2>
  108. <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>
  109. <div class="code-dark"><pre style="background-color:#2d2d2d;">
  110. <span style="color:#747369;"># macOS
  111. </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
  112. </span><span style="color:#d3d0c8;">
  113. </span><span style="color:#747369;"># Linux
  114. </span><span style="color:#747369;"># `-pthread`: cpp-httplib uses threads internally
  115. </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
  116. </span><span style="color:#d3d0c8;">
  117. </span><span style="color:#747369;"># Windows (Developer Command Prompt)
  118. </span><span style="color:#747369;"># `/EHsc`: Enable C++ exception handling
  119. </span><span style="color:#6699cc;">cl</span><span style="color:#d3d0c8;"> /EHsc /std:c++17 server.cpp
  120. </span></pre>
  121. </div><div class="code-light"><pre style="background-color:#eff1f5;">
  122. <span style="color:#a7adba;"># macOS
  123. </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
  124. </span><span style="color:#4f5b66;">
  125. </span><span style="color:#a7adba;"># Linux
  126. </span><span style="color:#a7adba;"># `-pthread`: cpp-httplib uses threads internally
  127. </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
  128. </span><span style="color:#4f5b66;">
  129. </span><span style="color:#a7adba;"># Windows (Developer Command Prompt)
  130. </span><span style="color:#a7adba;"># `/EHsc`: Enable C++ exception handling
  131. </span><span style="color:#8fa1b3;">cl</span><span style="color:#4f5b66;"> /EHsc /std:c++17 server.cpp
  132. </span></pre>
  133. </div>
  134. <p>Once it compiles, run it.</p>
  135. <div class="code-dark"><pre style="background-color:#2d2d2d;">
  136. <span style="color:#747369;"># macOS / Linux
  137. </span><span style="color:#6699cc;">./server
  138. </span><span style="color:#d3d0c8;">
  139. </span><span style="color:#747369;"># Windows
  140. </span><span style="color:#6699cc;">server.exe
  141. </span></pre>
  142. </div><div class="code-light"><pre style="background-color:#eff1f5;">
  143. <span style="color:#a7adba;"># macOS / Linux
  144. </span><span style="color:#8fa1b3;">./server
  145. </span><span style="color:#4f5b66;">
  146. </span><span style="color:#a7adba;"># Windows
  147. </span><span style="color:#8fa1b3;">server.exe
  148. </span></pre>
  149. </div>
  150. <p>Open <code>http://localhost:8080</code> in your browser. If you see "Hello, World!", you're all set.</p>
  151. <p>You can also verify with <code>curl</code>.</p>
  152. <div class="code-dark"><pre style="background-color:#2d2d2d;">
  153. <span style="color:#6699cc;">curl</span><span style="color:#d3d0c8;"> http://localhost:8080/
  154. </span><span style="color:#747369;"># Hello, World!
  155. </span></pre>
  156. </div><div class="code-light"><pre style="background-color:#eff1f5;">
  157. <span style="color:#8fa1b3;">curl</span><span style="color:#4f5b66;"> http://localhost:8080/
  158. </span><span style="color:#a7adba;"># Hello, World!
  159. </span></pre>
  160. </div>
  161. <p>To stop the server, press <code>Ctrl+C</code> in your terminal.</p>
  162. <h2>Next Steps</h2>
  163. <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>
  164. <p><strong>Next:</strong> <a href="../02-basic-client">Basic Client</a></p>
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