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<h1>HTTPS Server</h1>
<p>前章ではHTTPSクライアントを使いました。今度は自分でHTTPSサーバーを立ててみましょう。3章の <code>httplib::Server</code> を <code>httplib::SSLServer</code> に置き換えるだけです。</p>
<p>ただし、TLSサーバーにはサーバー証明書と秘密鍵が必要です。まずはそこから準備しましょう。</p>
<h2>自己署名証明書の作成</h2>
<p>開発やテスト用なら、自己署名証明書（いわゆるオレオレ証明書）で十分です。OpenSSLのコマンドでサクッと作れます。</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#8fa1b3;">openssl</span><span style="color:#c0c5ce;"> req</span><span style="color:#bf616a;"> -x509 -noenc -keyout</span><span style="color:#c0c5ce;"> key.pem</span><span style="color:#bf616a;"> -out</span><span style="color:#c0c5ce;"> cert.pem</span><span style="color:#bf616a;"> -subj</span><span style="color:#c0c5ce;"> /CN=localhost
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">openssl req -x509 -noenc -keyout key.pem -out cert.pem -subj /CN=localhost
</span></pre>
</div></div>
<p>これで2つのファイルができます。</p>
<ul>
<li><strong><code>cert.pem</code></strong> — サーバー証明書</li>
<li><strong><code>key.pem</code></strong> — 秘密鍵</li>
</ul>
<h2>最小のHTTPSサーバー</h2>
<p>証明書ができたら、さっそくサーバーを書いてみましょう。</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#b48ead;">#define </span><span style="color:#c0c5ce;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#c0c5ce;">&quot;
</span><span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#c0c5ce;">&gt;
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#c0c5ce;">() {
</span><span style="color:#c0c5ce;"> httplib::SSLServer </span><span style="color:#8fa1b3;">svr</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">cert.pem</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">key.pem</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;"> svr.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#c0c5ce;">&quot;, [](</span><span style="color:#b48ead;">const auto </span><span style="color:#c0c5ce;">&amp;, </span><span style="color:#b48ead;">auto </span><span style="color:#c0c5ce;">&amp;res) {
</span><span style="color:#c0c5ce;"> res.</span><span style="color:#8fa1b3;">set_content</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">Hello, HTTPS!</span><span style="color:#c0c5ce;">&quot;, &quot;</span><span style="color:#a3be8c;">text/plain</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;"> });
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;"> std::cout &lt;&lt; &quot;</span><span style="color:#a3be8c;">Listening on https://localhost:8443</span><span style="color:#c0c5ce;">&quot; &lt;&lt; std::endl;
</span><span style="color:#c0c5ce;"> svr.</span><span style="color:#8fa1b3;">listen</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">0.0.0.0</span><span style="color:#c0c5ce;">&quot;, </span><span style="color:#d08770;">8443</span><span style="color:#c0c5ce;">);
</span><span style="color:#c0c5ce;">}
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-weight:bold;color:#a71d5d;">#define </span><span style="color:#323232;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&quot;httplib.h&quot;
</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&lt;iostream&gt;
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
</span><span style="color:#323232;"> httplib::SSLServer svr(</span><span style="color:#183691;">&quot;cert.pem&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;key.pem&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="color:#323232;"> svr.Get(</span><span style="color:#183691;">&quot;/&quot;</span><span style="color:#323232;">, [](</span><span style="font-weight:bold;color:#a71d5d;">const auto &amp;</span><span style="color:#323232;">, </span><span style="font-weight:bold;color:#a71d5d;">auto &amp;</span><span style="color:#323232;">res) {
</span><span style="color:#323232;"> res.set_content(</span><span style="color:#183691;">&quot;Hello, HTTPS!&quot;</span><span style="color:#323232;">, </span><span style="color:#183691;">&quot;text/plain&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;"> });
</span><span style="color:#323232;">
</span><span style="color:#323232;"> std::cout </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt; </span><span style="color:#183691;">&quot;Listening on https://localhost:8443&quot; </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> std::endl;
</span><span style="color:#323232;"> svr.listen(</span><span style="color:#183691;">&quot;0.0.0.0&quot;</span><span style="color:#323232;">, </span><span style="color:#0086b3;">8443</span><span style="color:#323232;">);
</span><span style="color:#323232;">}
</span></pre>
</div></div>
<p><code>httplib::SSLServer</code> のコンストラクタに証明書と秘密鍵のパスを渡すだけです。ルーティングの書き方は3章の <code>httplib::Server</code> とまったく同じですよ。</p>
<p>コンパイルして起動しましょう。</p>
<h2>動作確認</h2>
<p>サーバーが起動したら、<code>curl</code> でアクセスしてみましょう。自己署名証明書なので、<code>-k</code> オプションで証明書検証をスキップします。</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#8fa1b3;">curl</span><span style="color:#bf616a;"> -k</span><span style="color:#c0c5ce;"> https://localhost:8443/
</span><span style="color:#65737e;"># Hello, HTTPS!
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="color:#323232;">curl -k https://localhost:8443/
</span><span style="font-style:italic;color:#969896;"># Hello, HTTPS!
</span></pre>
</div></div>
<p>ブラウザで <code>https://localhost:8443</code> を開くと、「この接続は安全ではありません」と警告が出ます。自己署名証明書なので正常です。気にせず進めてください。</p>
<h2>クライアントからの接続</h2>
<p>前章の <code>httplib::Client</code> で接続してみましょう。自己署名証明書のサーバーに接続するには、2つの方法があります。</p>
<h3>方法1: 証明書検証を無効にする</h3>
<p>開発時の手軽な方法です。</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#b48ead;">#define </span><span style="color:#c0c5ce;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#c0c5ce;">&quot;
</span><span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#c0c5ce;">&gt;
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#c0c5ce;">() {
</span><span style="color:#c0c5ce;"> httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://localhost:8443</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;"> cli.</span><span style="color:#8fa1b3;">enable_server_certificate_verification</span><span style="color:#c0c5ce;">(</span><span style="color:#d08770;">false</span><span style="color:#c0c5ce;">);
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;"> </span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> res = cli.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;"> </span><span style="color:#b48ead;">if </span><span style="color:#c0c5ce;">(res) {
</span><span style="color:#c0c5ce;"> std::cout &lt;&lt; res-&gt;</span><span style="color:#bf616a;">body </span><span style="color:#c0c5ce;">&lt;&lt; std::endl; </span><span style="color:#65737e;">// Hello, HTTPS!
</span><span style="color:#c0c5ce;"> }
</span><span style="color:#c0c5ce;">}
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-weight:bold;color:#a71d5d;">#define </span><span style="color:#323232;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&quot;httplib.h&quot;
</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&lt;iostream&gt;
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
</span><span style="color:#323232;"> httplib::Client cli(</span><span style="color:#183691;">&quot;https://localhost:8443&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;"> cli.enable_server_certificate_verification(</span><span style="color:#0086b3;">false</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="color:#323232;"> </span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> res </span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#323232;"> cli.Get(</span><span style="color:#183691;">&quot;/&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;"> </span><span style="font-weight:bold;color:#a71d5d;">if </span><span style="color:#323232;">(res) {
</span><span style="color:#323232;"> std::cout </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> res-&gt;body </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> std::endl; </span><span style="font-style:italic;color:#969896;">// Hello, HTTPS!
</span><span style="color:#323232;"> }
</span><span style="color:#323232;">}
</span></pre>
</div></div>
<h3>方法2: 自己署名証明書をCA証明書として指定する</h3>
<p>こちらのほうが安全です。<code>cert.pem</code> をCA証明書として信頼するよう指定します。</p>
<div class="code-block-wrapper"><div data-code-theme="dark"><pre style="background-color:#2b303b;">
<span style="color:#b48ead;">#define </span><span style="color:#c0c5ce;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&quot;</span><span style="color:#a3be8c;">httplib.h</span><span style="color:#c0c5ce;">&quot;
</span><span style="color:#b48ead;">#include </span><span style="color:#c0c5ce;">&lt;</span><span style="color:#a3be8c;">iostream</span><span style="color:#c0c5ce;">&gt;
</span><span style="color:#c0c5ce;">
</span><span style="color:#b48ead;">int </span><span style="color:#8fa1b3;">main</span><span style="color:#c0c5ce;">() {
</span><span style="color:#c0c5ce;"> httplib::Client </span><span style="color:#8fa1b3;">cli</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">https://localhost:8443</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;"> cli.</span><span style="color:#8fa1b3;">set_ca_cert_path</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">cert.pem</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;">
</span><span style="color:#c0c5ce;"> </span><span style="color:#b48ead;">auto</span><span style="color:#c0c5ce;"> res = cli.</span><span style="color:#8fa1b3;">Get</span><span style="color:#c0c5ce;">(&quot;</span><span style="color:#a3be8c;">/</span><span style="color:#c0c5ce;">&quot;);
</span><span style="color:#c0c5ce;"> </span><span style="color:#b48ead;">if </span><span style="color:#c0c5ce;">(res) {
</span><span style="color:#c0c5ce;"> std::cout &lt;&lt; res-&gt;</span><span style="color:#bf616a;">body </span><span style="color:#c0c5ce;">&lt;&lt; std::endl; </span><span style="color:#65737e;">// Hello, HTTPS!
</span><span style="color:#c0c5ce;"> }
</span><span style="color:#c0c5ce;">}
</span></pre>
</div><div data-code-theme="light"><pre style="background-color:#ffffff;">
<span style="font-weight:bold;color:#a71d5d;">#define </span><span style="color:#323232;">CPPHTTPLIB_OPENSSL_SUPPORT
</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&quot;httplib.h&quot;
</span><span style="font-weight:bold;color:#a71d5d;">#include </span><span style="color:#183691;">&lt;iostream&gt;
</span><span style="color:#323232;">
</span><span style="font-weight:bold;color:#a71d5d;">int </span><span style="font-weight:bold;color:#795da3;">main</span><span style="color:#323232;">() {
</span><span style="color:#323232;"> httplib::Client cli(</span><span style="color:#183691;">&quot;https://localhost:8443&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;"> cli.set_ca_cert_path(</span><span style="color:#183691;">&quot;cert.pem&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;">
</span><span style="color:#323232;"> </span><span style="font-weight:bold;color:#a71d5d;">auto</span><span style="color:#323232;"> res </span><span style="font-weight:bold;color:#a71d5d;">=</span><span style="color:#323232;"> cli.Get(</span><span style="color:#183691;">&quot;/&quot;</span><span style="color:#323232;">);
</span><span style="color:#323232;"> </span><span style="font-weight:bold;color:#a71d5d;">if </span><span style="color:#323232;">(res) {
</span><span style="color:#323232;"> std::cout </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> res-&gt;body </span><span style="font-weight:bold;color:#a71d5d;">&lt;&lt;</span><span style="color:#323232;"> std::endl; </span><span style="font-style:italic;color:#969896;">// Hello, HTTPS!
</span><span style="color:#323232;"> }
</span><span style="color:#323232;">}
</span></pre>
</div></div>
<p>この方法なら、指定した証明書のサーバーにだけ接続を許可して、なりすましを防げます。テスト環境でもなるべくこちらを使いましょう。</p>
<h2>Server と SSLServer の比較</h2>
<p>3章で学んだ <code>httplib::Server</code> のAPIは、<code>httplib::SSLServer</code> でもそのまま使えます。違いはコンストラクタだけです。</p>
<table><thead><tr><th></th><th><code>httplib::Server</code></th><th><code>httplib::SSLServer</code></th></tr></thead><tbody>
<tr><td>コンストラクタ</td><td>引数なし</td><td>証明書と秘密鍵のパス</td></tr>
<tr><td>プロトコル</td><td>HTTP</td><td>HTTPS</td></tr>
<tr><td>ポート（慣例）</td><td>8080</td><td>8443</td></tr>
<tr><td>ルーティング</td><td>共通</td><td>共通</td></tr>
</tbody></table>
<p>HTTPサーバーをHTTPSに切り替えるには、コンストラクタを変えるだけです。</p>
<h2>次のステップ</h2>
<p>HTTPSサーバーが動きましたね。これでHTTP/HTTPSのクライアントとサーバー、両方の基本がそろいました。</p>
<p>次は、cpp-httplibに新しく加わったWebSocket機能を見てみましょう。</p>
<p><strong>次:</strong> <a href="../08-websocket">WebSocket</a></p>
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