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    <h1>Getting Started</h1>
    <p>cpp-httplibを始めるのに必要なのは、<code>httplib.h</code>とC++コンパイラーだけです。ファイルをダウンロードして、Hello Worldサーバーを動かすところまでやってみましょう。</p>
<h2>httplib.h の入手</h2>
<p>GitHubから直接ダウンロードできます。常に最新版を使ってください。</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>ダウンロードした <code>httplib.h</code> をプロジェクトのディレクトリに置けば、準備完了です。</p>
<h2>コンパイラーの準備</h2>
<table><thead><tr><th>OS</th><th>開発環境</th><th>セットアップ</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++ または g++</td><td><code>apt install clang</code> または <code>apt install g++</code></td></tr>
<tr><td>Windows</td><td>MSVC</td><td>Visual Studio 2022 以降（C++ コンポーネントを含めてインストール）</td></tr>
</tbody></table>
<h2>Hello World サーバー</h2>
<p>次のコードを <code>server.cpp</code> として保存しましょう。</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>たった数行で、HTTPリクエストに応答するサーバーが書けます。</p>
<h2>コンパイルと実行</h2>
<p>このチュートリアルのサンプルコードは、コードを簡潔に書けるC++17で書いています。cpp-httplib自体はC++11でもコンパイルできます。</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は内部でスレッドを使用
</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`: C++例外処理を有効化
</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は内部でスレッドを使用
</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`: C++例外処理を有効化
</span><span style="color:#8fa1b3;">cl</span><span style="color:#4f5b66;"> /EHsc /std:c++17 server.cpp
</span></pre>
</div>
<p>コンパイルできたら実行します。</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>ブラウザで <code>http://localhost:8080</code> を開いてください。"Hello, World!" と表示されれば成功です。</p>
<p><code>curl</code> でも確認できます。</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>サーバーを停止するには、ターミナルで <code>Ctrl+C</code> を押します。</p>
<h2>次のステップ</h2>
<p>サーバーの基本がわかりましたね。次は、クライアント側を見てみましょう。cpp-httplibはHTTPクライアント機能も備えています。</p>
<p><strong>次:</strong> <a href="../02-basic-client">Basic Client</a></p>

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