Documentation Site on GitHub Pages (#2376)

* Add initial documentations

* Update documentation for Basic Client and add WebSocket section

* feat: add a static site generator with multi-language support

- Introduced a new Rust-based static site generator in the `docs-gen` directory.
- Implemented core functionality for building sites from markdown files, including:
  - Configuration loading from `config.toml`.
  - Markdown rendering with frontmatter support.
  - Navigation generation based on page structure.
  - Static file copying and output directory management.
- Added templates for base layout, pages, and portal.
- Created a CSS file for styling and a JavaScript file for interactive features like language selection and theme toggling.
- Updated documentation source with new configuration and example pages in English and Japanese.
- Added a `justfile` target for building the documentation site.

* Add language/theme toggle functionality

- Created a new Japanese tour index page at docs/ja/tour/index.html
- Implemented navigation links for various sections of the cpp-httplib tutorial
- Added a language selector to switch between English and Japanese
- Introduced theme toggle functionality to switch between light and dark modes
- Added mobile sidebar toggle for better navigation on smaller screens
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<!DOCTYPE html>
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<title>TLS Setup - cpp-httplib</title>
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<a href="/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="&#x2F;ja&#x2F;tour&#x2F;" class="nav-section-title active">A Tour of cpp-httplib</a>
<ul class="nav-list">
<li><a href="&#x2F;ja&#x2F;tour&#x2F;01-getting-started&#x2F;" class="">Getting Started</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;02-basic-client&#x2F;" class="">Basic Client</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;03-basic-server&#x2F;" class="">Basic Server</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;04-static-file-server&#x2F;" class="">Static File Server</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;05-tls-setup&#x2F;" class="active">TLS Setup</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;06-https-client&#x2F;" class="">HTTPS Client</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;07-https-server&#x2F;" class="">HTTPS Server</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;08-websocket&#x2F;" class="">WebSocket</a></li>
<li><a href="&#x2F;ja&#x2F;tour&#x2F;09-whats-next&#x2F;" class="">What&#x27;s Next</a></li>
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<article>
<h1>TLS Setup</h1>
<p>ここまではHTTP平文でやってきましたが、実際のWebではHTTPS暗号化通信が当たり前ですよね。cpp-httplibでHTTPSを使うには、TLSライブラリが必要です。</p>
<p>このTourではOpenSSLを使います。最も広く使われていて、情報も豊富です。</p>
<h2>OpenSSLのインストール</h2>
<p>お使いのOSに合わせてインストールしましょう。</p>
<table><thead><tr><th>OS</th><th>インストール方法</th></tr></thead><tbody>
<tr><td>macOS</td><td><a href="https://brew.sh/">Homebrew</a> (<code>brew install openssl</code>)</td></tr>
<tr><td>Ubuntu / Debian</td><td><code>sudo apt install libssl-dev</code></td></tr>
<tr><td>Windows</td><td><a href="https://vcpkg.io/">vcpkg</a> (<code>vcpkg install openssl</code>)</td></tr>
</tbody></table>
<h2>コンパイルオプション</h2>
<p>TLS機能を有効にするには、<code>CPPHTTPLIB_OPENSSL_SUPPORT</code> マクロを定義してコンパイルします。前章までのコンパイルコマンドに、いくつかオプションが増えます。</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#747369;"># macOS (Homebrew)
</span><span style="color:#6699cc;">clang++</span><span style="color:#f2777a;"> -std</span><span style="color:#d3d0c8;">=c++17</span><span style="color:#f2777a;"> -DCPPHTTPLIB_OPENSSL_SUPPORT </span><span style="color:#d3d0c8;">\
</span><span style="color:#f2777a;"> -I</span><span style="color:#d3d0c8;">$</span><span style="color:#f2777a;">(</span><span style="color:#6699cc;">brew</span><span style="color:#f2777a;"> --prefix openssl)</span><span style="color:#d3d0c8;">/include \
</span><span style="color:#f2777a;"> -L</span><span style="color:#d3d0c8;">$</span><span style="color:#f2777a;">(</span><span style="color:#6699cc;">brew</span><span style="color:#f2777a;"> --prefix openssl)</span><span style="color:#d3d0c8;">/lib \
</span><span style="color:#f2777a;"> -lssl -lcrypto </span><span style="color:#d3d0c8;">\
</span><span style="color:#f2777a;"> -framework</span><span style="color:#d3d0c8;"> CoreFoundation</span><span style="color:#f2777a;"> -framework</span><span style="color:#d3d0c8;"> Security \
</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:#6699cc;">clang++</span><span style="color:#f2777a;"> -std</span><span style="color:#d3d0c8;">=c++17</span><span style="color:#f2777a;"> -pthread -DCPPHTTPLIB_OPENSSL_SUPPORT </span><span style="color:#d3d0c8;">\
</span><span style="color:#f2777a;"> -lssl -lcrypto </span><span style="color:#d3d0c8;">\
</span><span style="color:#f2777a;"> -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:#6699cc;">cl</span><span style="color:#d3d0c8;"> /EHsc /std:c++17 /DCPPHTTPLIB_OPENSSL_SUPPORT server.cpp libssl.lib libcrypto.lib
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#a7adba;"># macOS (Homebrew)
</span><span style="color:#8fa1b3;">clang++</span><span style="color:#bf616a;"> -std</span><span style="color:#4f5b66;">=c++17</span><span style="color:#bf616a;"> -DCPPHTTPLIB_OPENSSL_SUPPORT </span><span style="color:#4f5b66;">\
</span><span style="color:#bf616a;"> -I</span><span style="color:#4f5b66;">$</span><span style="color:#bf616a;">(</span><span style="color:#8fa1b3;">brew</span><span style="color:#bf616a;"> --prefix openssl)</span><span style="color:#4f5b66;">/include \
</span><span style="color:#bf616a;"> -L</span><span style="color:#4f5b66;">$</span><span style="color:#bf616a;">(</span><span style="color:#8fa1b3;">brew</span><span style="color:#bf616a;"> --prefix openssl)</span><span style="color:#4f5b66;">/lib \
</span><span style="color:#bf616a;"> -lssl -lcrypto </span><span style="color:#4f5b66;">\
</span><span style="color:#bf616a;"> -framework</span><span style="color:#4f5b66;"> CoreFoundation</span><span style="color:#bf616a;"> -framework</span><span style="color:#4f5b66;"> Security \
</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:#8fa1b3;">clang++</span><span style="color:#bf616a;"> -std</span><span style="color:#4f5b66;">=c++17</span><span style="color:#bf616a;"> -pthread -DCPPHTTPLIB_OPENSSL_SUPPORT </span><span style="color:#4f5b66;">\
</span><span style="color:#bf616a;"> -lssl -lcrypto </span><span style="color:#4f5b66;">\
</span><span style="color:#bf616a;"> -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:#8fa1b3;">cl</span><span style="color:#4f5b66;"> /EHsc /std:c++17 /DCPPHTTPLIB_OPENSSL_SUPPORT server.cpp libssl.lib libcrypto.lib
</span></pre>
</div>
<p>それぞれのオプションの役割を見てみましょう。</p>
<ul>
<li><strong><code>-DCPPHTTPLIB_OPENSSL_SUPPORT</code></strong> — TLS機能を有効にするマクロ定義</li>
<li><strong><code>-lssl -lcrypto</code></strong> — OpenSSLのライブラリをリンク</li>
<li><strong><code>-I</code> / <code>-L</code></strong>macOSのみ— Homebrew版OpenSSLのパスを指定</li>
<li><strong><code>-framework CoreFoundation -framework Security</code></strong>macOSのみ— Keychainからシステム証明書を自動で読み込むために必要です</li>
</ul>
<h2>動作確認</h2>
<p>ちゃんと動くか確認してみましょう。<code>httplib::Client</code> にHTTPSのURLを渡してアクセスするだけのプログラムです。</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#cc99cc;">#define </span><span style="color:#d3d0c8;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><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:#cc99cc;">#include </span><span style="color:#d3d0c8;">&lt;</span><span style="color:#99cc99;">iostream</span><span style="color:#d3d0c8;">&gt;
</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::Client </span><span style="color:#6699cc;">cli</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">https://www.google.com</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;"> </span><span style="color:#cc99cc;">auto</span><span style="color:#d3d0c8;"> res = cli.</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:#d3d0c8;"> </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(res) {
</span><span style="color:#d3d0c8;"> std::cout &lt;&lt; &quot;</span><span style="color:#99cc99;">Status: </span><span style="color:#d3d0c8;">&quot; &lt;&lt; res-&gt;</span><span style="color:#f2777a;">status </span><span style="color:#d3d0c8;">&lt;&lt; std::endl;
</span><span style="color:#d3d0c8;"> } </span><span style="color:#cc99cc;">else </span><span style="color:#d3d0c8;">{
</span><span style="color:#d3d0c8;"> std::cout &lt;&lt; &quot;</span><span style="color:#99cc99;">Error: </span><span style="color:#d3d0c8;">&quot; &lt;&lt; </span><span style="color:#6699cc;">httplib::to_string</span><span style="color:#d3d0c8;">(res.</span><span style="color:#6699cc;">error</span><span style="color:#d3d0c8;">()) &lt;&lt; std::endl;
</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;">#define </span><span style="color:#4f5b66;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><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:#b48ead;">#include </span><span style="color:#4f5b66;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#4f5b66;">&gt;
</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::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">https://www.google.com</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;"> </span><span style="color:#b48ead;">auto</span><span style="color:#4f5b66;"> res = cli.</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:#4f5b66;"> </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(res) {
</span><span style="color:#4f5b66;"> std::cout &lt;&lt; &quot;</span><span style="color:#a3be8c;">Status: </span><span style="color:#4f5b66;">&quot; &lt;&lt; res-&gt;</span><span style="color:#bf616a;">status </span><span style="color:#4f5b66;">&lt;&lt; std::endl;
</span><span style="color:#4f5b66;"> } </span><span style="color:#b48ead;">else </span><span style="color:#4f5b66;">{
</span><span style="color:#4f5b66;"> std::cout &lt;&lt; &quot;</span><span style="color:#a3be8c;">Error: </span><span style="color:#4f5b66;">&quot; &lt;&lt; </span><span style="color:#8fa1b3;">httplib::to_string</span><span style="color:#4f5b66;">(res.</span><span style="color:#8fa1b3;">error</span><span style="color:#4f5b66;">()) &lt;&lt; std::endl;
</span><span style="color:#4f5b66;"> }
</span><span style="color:#4f5b66;">}
</span></pre>
</div>
<p>コンパイルして実行してみてください。<code>Status: 200</code> と表示されれば、セットアップ完了です。</p>
<h2>他のTLSバックエンド</h2>
<p>cpp-httplibはOpenSSL以外にも、Mbed TLSとwolfSSLに対応しています。マクロ定義とリンクするライブラリを変えるだけで切り替えられます。</p>
<table><thead><tr><th style="text-align: left">バックエンド</th><th style="text-align: left">マクロ定義</th><th style="text-align: left">リンクするライブラリ</th></tr></thead><tbody>
<tr><td style="text-align: left">OpenSSL</td><td style="text-align: left"><code>CPPHTTPLIB_OPENSSL_SUPPORT</code></td><td style="text-align: left"><code>libssl</code>, <code>libcrypto</code></td></tr>
<tr><td style="text-align: left">Mbed TLS</td><td style="text-align: left"><code>CPPHTTPLIB_MBEDTLS_SUPPORT</code></td><td style="text-align: left"><code>libmbedtls</code>, <code>libmbedx509</code>, <code>libmbedcrypto</code></td></tr>
<tr><td style="text-align: left">wolfSSL</td><td style="text-align: left"><code>CPPHTTPLIB_WOLFSSL_SUPPORT</code></td><td style="text-align: left"><code>libwolfssl</code></td></tr>
</tbody></table>
<p>このTourではOpenSSLを前提に進めますが、APIはどのバックエンドでも共通です。</p>
<h2>次のステップ</h2>
<p>TLSの準備ができましたね。次は、HTTPSサイトにリクエストを送ってみましょう。</p>
<p><strong>次:</strong> <a href="../06-https-client">HTTPS Client</a></p>
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