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<title>Getting Started - cpp-httplib</title>
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<a href="/cpp-httplib/ja/" 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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<a href="/cpp-httplib/ja/tour/" class="nav-section-title active">A Tour of cpp-httplib</a>
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<li><a href="/cpp-httplib/ja/tour/01-getting-started/" class="active">Getting Started</a></li>
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<li><a href="/cpp-httplib/ja/tour/02-basic-client/" class="">Basic Client</a></li>
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<li><a href="/cpp-httplib/ja/tour/03-basic-server/" class="">Basic Server</a></li>
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<li><a href="/cpp-httplib/ja/tour/04-static-file-server/" class="">Static File Server</a></li>
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<li><a href="/cpp-httplib/ja/tour/05-tls-setup/" class="">TLS Setup</a></li>
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<article>
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<h1>Getting Started</h1>
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<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>
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<h2>httplib.h の入手</h2>
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<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>
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<div class="code-dark"><pre style="background-color:#2d2d2d;">
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<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
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</span></pre>
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</div><div class="code-light"><pre style="background-color:#eff1f5;">
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<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
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</span></pre>
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</div>
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<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>
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<h2>コンパイラーの準備</h2>
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<table><thead><tr><th>OS</th><th>開発環境</th><th>セットアップ</th></tr></thead><tbody>
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<tr><td>macOS</td><td>Apple Clang</td><td>Xcode Command Line Tools (<code>xcode-select --install</code>)</td></tr>
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<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>
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<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>
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</tbody></table>
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<h2>Hello World サーバー</h2>
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<p>次のコードを <code>server.cpp</code> として保存しましょう。</p>
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<div class="code-dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#cc99cc;">#include </span><span style="color:#d3d0c8;">"</span><span style="color:#99cc99;">httplib.h</span><span style="color:#d3d0c8;">"
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#cc99cc;">int </span><span style="color:#6699cc;">main</span><span style="color:#d3d0c8;">() {
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</span><span style="color:#d3d0c8;"> httplib::Server svr;
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">Get</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">/</span><span style="color:#d3d0c8;">", [](</span><span style="color:#cc99cc;">const</span><span style="color:#d3d0c8;"> httplib::Request&, httplib::Response& res) {
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</span><span style="color:#d3d0c8;"> res.</span><span style="color:#6699cc;">set_content</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">Hello, World!</span><span style="color:#d3d0c8;">", "</span><span style="color:#99cc99;">text/plain</span><span style="color:#d3d0c8;">");
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</span><span style="color:#d3d0c8;"> });
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#d3d0c8;"> svr.</span><span style="color:#6699cc;">listen</span><span style="color:#d3d0c8;">("</span><span style="color:#99cc99;">0.0.0.0</span><span style="color:#d3d0c8;">", </span><span style="color:#f99157;">8080</span><span style="color:#d3d0c8;">);
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</span><span style="color:#d3d0c8;">}
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</span></pre>
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</div><div class="code-light"><pre style="background-color:#eff1f5;">
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<span style="color:#b48ead;">#include </span><span style="color:#4f5b66;">"</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#4f5b66;">"
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</span><span style="color:#4f5b66;">
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</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#4f5b66;">() {
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</span><span style="color:#4f5b66;"> httplib::Server svr;
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</span><span style="color:#4f5b66;">
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</span><span style="color:#4f5b66;"> svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#4f5b66;">("</span><span style="color:#a3be8c;">/</span><span style="color:#4f5b66;">", [](</span><span style="color:#b48ead;">const</span><span style="color:#4f5b66;"> httplib::Request&, httplib::Response& res) {
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</span><span style="color:#4f5b66;"> res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#4f5b66;">("</span><span style="color:#a3be8c;">Hello, World!</span><span style="color:#4f5b66;">", "</span><span style="color:#a3be8c;">text/plain</span><span style="color:#4f5b66;">");
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</span><span style="color:#4f5b66;"> });
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</span><span style="color:#4f5b66;">
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</span><span style="color:#4f5b66;"> svr.</span><span style="color:#8fa1b3;">listen</span><span style="color:#4f5b66;">("</span><span style="color:#a3be8c;">0.0.0.0</span><span style="color:#4f5b66;">", </span><span style="color:#d08770;">8080</span><span style="color:#4f5b66;">);
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</span><span style="color:#4f5b66;">}
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</span></pre>
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</div>
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<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>
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<h2>コンパイルと実行</h2>
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<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>
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<div class="code-dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#747369;"># macOS
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</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
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#747369;"># Linux
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</span><span style="color:#747369;"># `-pthread`: cpp-httplibは内部でスレッドを使用
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</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
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#747369;"># Windows (Developer Command Prompt)
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</span><span style="color:#747369;"># `/EHsc`: C++例外処理を有効化
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</span><span style="color:#6699cc;">cl</span><span style="color:#d3d0c8;"> /EHsc /std:c++17 server.cpp
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</span></pre>
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</div><div class="code-light"><pre style="background-color:#eff1f5;">
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<span style="color:#a7adba;"># macOS
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</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
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</span><span style="color:#4f5b66;">
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</span><span style="color:#a7adba;"># Linux
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</span><span style="color:#a7adba;"># `-pthread`: cpp-httplibは内部でスレッドを使用
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</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
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</span><span style="color:#4f5b66;">
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</span><span style="color:#a7adba;"># Windows (Developer Command Prompt)
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</span><span style="color:#a7adba;"># `/EHsc`: C++例外処理を有効化
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</span><span style="color:#8fa1b3;">cl</span><span style="color:#4f5b66;"> /EHsc /std:c++17 server.cpp
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</span></pre>
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</div>
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<p>コンパイルできたら実行します。</p>
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<div class="code-dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#747369;"># macOS / Linux
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</span><span style="color:#6699cc;">./server
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</span><span style="color:#d3d0c8;">
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</span><span style="color:#747369;"># Windows
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</span><span style="color:#6699cc;">server.exe
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</span></pre>
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</div><div class="code-light"><pre style="background-color:#eff1f5;">
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<span style="color:#a7adba;"># macOS / Linux
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</span><span style="color:#8fa1b3;">./server
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</span><span style="color:#4f5b66;">
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</span><span style="color:#a7adba;"># Windows
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</span><span style="color:#8fa1b3;">server.exe
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</span></pre>
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</div>
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<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>
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<p><code>curl</code> でも確認できます。</p>
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<div class="code-dark"><pre style="background-color:#2d2d2d;">
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<span style="color:#6699cc;">curl</span><span style="color:#d3d0c8;"> http://localhost:8080/
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</span><span style="color:#747369;"># Hello, World!
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</span></pre>
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</div><div class="code-light"><pre style="background-color:#eff1f5;">
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<span style="color:#8fa1b3;">curl</span><span style="color:#4f5b66;"> http://localhost:8080/
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</span><span style="color:#a7adba;"># Hello, World!
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</span></pre>
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</div>
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<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>
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<h2>次のステップ</h2>
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<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>
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<p><strong>次:</strong> <a href="../02-basic-client">Basic Client</a></p>
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</article>
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