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cpp-httplib
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    <h1>WebSocket</h1>
    <p>cpp-httplibはWebSocketにも対応しています。HTTPのリクエスト/レスポンスと違い、WebSocketはサーバーとクライアントが双方向にメッセージをやり取りできます。チャットやリアルタイム通知に便利です。</p>
<p>さっそく、エコーサーバーとクライアントを作ってみましょう。</p>
<h2>エコーサーバー</h2>
<p>受け取ったメッセージをそのまま返すエコーサーバーです。</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:#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::Server svr;
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    svr.</span><span style="color:#6699cc;">WebSocket</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/ws</span><span style="color:#d3d0c8;">&quot;, [](</span><span style="color:#cc99cc;">const</span><span style="color:#d3d0c8;"> httplib::Request &amp;, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#d3d0c8;">        std::string msg;
</span><span style="color:#d3d0c8;">        </span><span style="color:#cc99cc;">while </span><span style="color:#d3d0c8;">(ws.</span><span style="color:#6699cc;">read</span><span style="color:#d3d0c8;">(msg)) {
</span><span style="color:#d3d0c8;">            ws.</span><span style="color:#6699cc;">send</span><span style="color:#d3d0c8;">(msg);  </span><span style="color:#747369;">// 受け取ったメッセージをそのまま返す
</span><span style="color:#d3d0c8;">        }
</span><span style="color:#d3d0c8;">    });
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    std::cout &lt;&lt; &quot;</span><span style="color:#99cc99;">Listening on port 8080...</span><span style="color:#d3d0c8;">&quot; &lt;&lt; std::endl;
</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:#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::Server svr;
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    svr.</span><span style="color:#8fa1b3;">WebSocket</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/ws</span><span style="color:#4f5b66;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#4f5b66;"> httplib::Request &amp;, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#4f5b66;">        std::string msg;
</span><span style="color:#4f5b66;">        </span><span style="color:#b48ead;">while </span><span style="color:#4f5b66;">(ws.</span><span style="color:#8fa1b3;">read</span><span style="color:#4f5b66;">(msg)) {
</span><span style="color:#4f5b66;">            ws.</span><span style="color:#8fa1b3;">send</span><span style="color:#4f5b66;">(msg);  </span><span style="color:#a7adba;">// 受け取ったメッセージをそのまま返す
</span><span style="color:#4f5b66;">        }
</span><span style="color:#4f5b66;">    });
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    std::cout &lt;&lt; &quot;</span><span style="color:#a3be8c;">Listening on port 8080...</span><span style="color:#4f5b66;">&quot; &lt;&lt; std::endl;
</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><code>svr.WebSocket()</code> でWebSocketハンドラーを登録します。3章の <code>svr.Get()</code> や <code>svr.Post()</code> と同じ感覚ですね。</p>
<p>ハンドラーの中では、<code>ws.read(msg)</code> でメッセージを待ちます。接続が閉じられると <code>read()</code> が <code>false</code> を返すので、ループを抜けます。<code>ws.send(msg)</code> でメッセージを送り返します。</p>
<h2>クライアントからの接続</h2>
<p><code>httplib::ws::WebSocketClient</code> を使ってサーバーに接続してみましょう。</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:#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::ws::WebSocketClient </span><span style="color:#6699cc;">client</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">ws://localhost:8080/ws</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(!client.</span><span style="color:#6699cc;">connect</span><span style="color:#d3d0c8;">()) {
</span><span style="color:#d3d0c8;">        std::cout &lt;&lt; &quot;</span><span style="color:#99cc99;">Connection failed</span><span style="color:#d3d0c8;">&quot; &lt;&lt; std::endl;
</span><span style="color:#d3d0c8;">        </span><span style="color:#cc99cc;">return </span><span style="color:#f99157;">1</span><span style="color:#d3d0c8;">;
</span><span style="color:#d3d0c8;">    }
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    </span><span style="color:#747369;">// メッセージを送信
</span><span style="color:#d3d0c8;">    client.</span><span style="color:#6699cc;">send</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">Hello, WebSocket!</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    </span><span style="color:#747369;">// サーバーからの応答を受信
</span><span style="color:#d3d0c8;">    std::string msg;
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(client.</span><span style="color:#6699cc;">read</span><span style="color:#d3d0c8;">(msg)) {
</span><span style="color:#d3d0c8;">        std::cout &lt;&lt; msg &lt;&lt; std::endl;  </span><span style="color:#747369;">// Hello, WebSocket!
</span><span style="color:#d3d0c8;">    }
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    client.</span><span style="color:#6699cc;">close</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:#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::ws::WebSocketClient </span><span style="color:#8fa1b3;">client</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">ws://localhost:8080/ws</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(!client.</span><span style="color:#8fa1b3;">connect</span><span style="color:#4f5b66;">()) {
</span><span style="color:#4f5b66;">        std::cout &lt;&lt; &quot;</span><span style="color:#a3be8c;">Connection failed</span><span style="color:#4f5b66;">&quot; &lt;&lt; std::endl;
</span><span style="color:#4f5b66;">        </span><span style="color:#b48ead;">return </span><span style="color:#d08770;">1</span><span style="color:#4f5b66;">;
</span><span style="color:#4f5b66;">    }
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    </span><span style="color:#a7adba;">// メッセージを送信
</span><span style="color:#4f5b66;">    client.</span><span style="color:#8fa1b3;">send</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">Hello, WebSocket!</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    </span><span style="color:#a7adba;">// サーバーからの応答を受信
</span><span style="color:#4f5b66;">    std::string msg;
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(client.</span><span style="color:#8fa1b3;">read</span><span style="color:#4f5b66;">(msg)) {
</span><span style="color:#4f5b66;">        std::cout &lt;&lt; msg &lt;&lt; std::endl;  </span><span style="color:#a7adba;">// Hello, WebSocket!
</span><span style="color:#4f5b66;">    }
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    client.</span><span style="color:#8fa1b3;">close</span><span style="color:#4f5b66;">();
</span><span style="color:#4f5b66;">}
</span></pre>
</div>
<p>コンストラクタには <code>ws://host:port/path</code> 形式のURLを渡します。<code>connect()</code> で接続を開始し、<code>send()</code> と <code>read()</code> でメッセージをやり取りします。</p>
<h2>テキストとバイナリ</h2>
<p>WebSocketにはテキストとバイナリの2種類のメッセージがあります。<code>read()</code> の戻り値で区別できます。</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#d3d0c8;">svr.</span><span style="color:#6699cc;">WebSocket</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/ws</span><span style="color:#d3d0c8;">&quot;, [](</span><span style="color:#cc99cc;">const</span><span style="color:#d3d0c8;"> httplib::Request &amp;, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#d3d0c8;">    std::string msg;
</span><span style="color:#d3d0c8;">    httplib::ws::ReadResult ret;
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">while </span><span style="color:#d3d0c8;">((ret = ws.</span><span style="color:#6699cc;">read</span><span style="color:#d3d0c8;">(msg))) {
</span><span style="color:#d3d0c8;">        </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(ret == httplib::ws::Binary) {
</span><span style="color:#d3d0c8;">            ws.</span><span style="color:#6699cc;">send</span><span style="color:#d3d0c8;">(msg.</span><span style="color:#6699cc;">data</span><span style="color:#d3d0c8;">(), msg.</span><span style="color:#6699cc;">size</span><span style="color:#d3d0c8;">());  </span><span style="color:#747369;">// バイナリとして送信
</span><span style="color:#d3d0c8;">        } </span><span style="color:#cc99cc;">else </span><span style="color:#d3d0c8;">{
</span><span style="color:#d3d0c8;">            ws.</span><span style="color:#6699cc;">send</span><span style="color:#d3d0c8;">(msg);  </span><span style="color:#747369;">// テキストとして送信
</span><span style="color:#d3d0c8;">        }
</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:#4f5b66;">svr.</span><span style="color:#8fa1b3;">WebSocket</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/ws</span><span style="color:#4f5b66;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#4f5b66;"> httplib::Request &amp;, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#4f5b66;">    std::string msg;
</span><span style="color:#4f5b66;">    httplib::ws::ReadResult ret;
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">while </span><span style="color:#4f5b66;">((ret = ws.</span><span style="color:#8fa1b3;">read</span><span style="color:#4f5b66;">(msg))) {
</span><span style="color:#4f5b66;">        </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(ret == httplib::ws::Binary) {
</span><span style="color:#4f5b66;">            ws.</span><span style="color:#8fa1b3;">send</span><span style="color:#4f5b66;">(msg.</span><span style="color:#8fa1b3;">data</span><span style="color:#4f5b66;">(), msg.</span><span style="color:#8fa1b3;">size</span><span style="color:#4f5b66;">());  </span><span style="color:#a7adba;">// バイナリとして送信
</span><span style="color:#4f5b66;">        } </span><span style="color:#b48ead;">else </span><span style="color:#4f5b66;">{
</span><span style="color:#4f5b66;">            ws.</span><span style="color:#8fa1b3;">send</span><span style="color:#4f5b66;">(msg);  </span><span style="color:#a7adba;">// テキストとして送信
</span><span style="color:#4f5b66;">        }
</span><span style="color:#4f5b66;">    }
</span><span style="color:#4f5b66;">});
</span></pre>
</div>
<ul>
<li><code>ws.send(const std::string &amp;)</code> — テキストメッセージとして送信</li>
<li><code>ws.send(const char *, size_t)</code> — バイナリメッセージとして送信</li>
</ul>
<p>クライアント側も同じAPIです。</p>
<h2>リクエスト情報へのアクセス</h2>
<p>ハンドラーの第1引数 <code>req</code> から、ハンドシェイク時のHTTPリクエスト情報を読み取れます。認証トークンの確認などに便利です。</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#d3d0c8;">svr.</span><span style="color:#6699cc;">WebSocket</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/ws</span><span style="color:#d3d0c8;">&quot;, [](</span><span style="color:#cc99cc;">const</span><span style="color:#d3d0c8;"> httplib::Request &amp;req, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">auto</span><span style="color:#d3d0c8;"> token = req.</span><span style="color:#6699cc;">get_header_value</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">Authorization</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">if </span><span style="color:#d3d0c8;">(token.</span><span style="color:#6699cc;">empty</span><span style="color:#d3d0c8;">()) {
</span><span style="color:#d3d0c8;">        ws.</span><span style="color:#6699cc;">close</span><span style="color:#d3d0c8;">(httplib::ws::CloseStatus::PolicyViolation, &quot;</span><span style="color:#99cc99;">unauthorized</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">        </span><span style="color:#cc99cc;">return</span><span style="color:#d3d0c8;">;
</span><span style="color:#d3d0c8;">    }
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">    std::string msg;
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">while </span><span style="color:#d3d0c8;">(ws.</span><span style="color:#6699cc;">read</span><span style="color:#d3d0c8;">(msg)) {
</span><span style="color:#d3d0c8;">        ws.</span><span style="color:#6699cc;">send</span><span style="color:#d3d0c8;">(msg);
</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:#4f5b66;">svr.</span><span style="color:#8fa1b3;">WebSocket</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/ws</span><span style="color:#4f5b66;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#4f5b66;"> httplib::Request &amp;req, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">auto</span><span style="color:#4f5b66;"> token = req.</span><span style="color:#8fa1b3;">get_header_value</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">Authorization</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">if </span><span style="color:#4f5b66;">(token.</span><span style="color:#8fa1b3;">empty</span><span style="color:#4f5b66;">()) {
</span><span style="color:#4f5b66;">        ws.</span><span style="color:#8fa1b3;">close</span><span style="color:#4f5b66;">(httplib::ws::CloseStatus::PolicyViolation, &quot;</span><span style="color:#a3be8c;">unauthorized</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">        </span><span style="color:#b48ead;">return</span><span style="color:#4f5b66;">;
</span><span style="color:#4f5b66;">    }
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">    std::string msg;
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">while </span><span style="color:#4f5b66;">(ws.</span><span style="color:#8fa1b3;">read</span><span style="color:#4f5b66;">(msg)) {
</span><span style="color:#4f5b66;">        ws.</span><span style="color:#8fa1b3;">send</span><span style="color:#4f5b66;">(msg);
</span><span style="color:#4f5b66;">    }
</span><span style="color:#4f5b66;">});
</span></pre>
</div>
<h2>WSSで使う</h2>
<p>HTTPS上のWebSocket（WSS）にも対応しています。サーバー側は <code>httplib::SSLServer</code> にWebSocketハンドラーを登録するだけです。</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#d3d0c8;">httplib::SSLServer </span><span style="color:#6699cc;">svr</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">cert.pem</span><span style="color:#d3d0c8;">&quot;, &quot;</span><span style="color:#99cc99;">key.pem</span><span style="color:#d3d0c8;">&quot;);
</span><span style="color:#d3d0c8;">
</span><span style="color:#d3d0c8;">svr.</span><span style="color:#6699cc;">WebSocket</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">/ws</span><span style="color:#d3d0c8;">&quot;, [](</span><span style="color:#cc99cc;">const</span><span style="color:#d3d0c8;"> httplib::Request &amp;, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#d3d0c8;">    std::string msg;
</span><span style="color:#d3d0c8;">    </span><span style="color:#cc99cc;">while </span><span style="color:#d3d0c8;">(ws.</span><span style="color:#6699cc;">read</span><span style="color:#d3d0c8;">(msg)) {
</span><span style="color:#d3d0c8;">        ws.</span><span style="color:#6699cc;">send</span><span style="color:#d3d0c8;">(msg);
</span><span style="color:#d3d0c8;">    }
</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;">8443</span><span style="color:#d3d0c8;">);
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#4f5b66;">httplib::SSLServer </span><span style="color:#8fa1b3;">svr</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">cert.pem</span><span style="color:#4f5b66;">&quot;, &quot;</span><span style="color:#a3be8c;">key.pem</span><span style="color:#4f5b66;">&quot;);
</span><span style="color:#4f5b66;">
</span><span style="color:#4f5b66;">svr.</span><span style="color:#8fa1b3;">WebSocket</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">/ws</span><span style="color:#4f5b66;">&quot;, [](</span><span style="color:#b48ead;">const</span><span style="color:#4f5b66;"> httplib::Request &amp;, httplib::ws::WebSocket &amp;ws) {
</span><span style="color:#4f5b66;">    std::string msg;
</span><span style="color:#4f5b66;">    </span><span style="color:#b48ead;">while </span><span style="color:#4f5b66;">(ws.</span><span style="color:#8fa1b3;">read</span><span style="color:#4f5b66;">(msg)) {
</span><span style="color:#4f5b66;">        ws.</span><span style="color:#8fa1b3;">send</span><span style="color:#4f5b66;">(msg);
</span><span style="color:#4f5b66;">    }
</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;">8443</span><span style="color:#4f5b66;">);
</span></pre>
</div>
<p>クライアント側は <code>wss://</code> スキームを使います。</p>
<div class="code-dark"><pre style="background-color:#2d2d2d;">
<span style="color:#d3d0c8;">httplib::ws::WebSocketClient </span><span style="color:#6699cc;">client</span><span style="color:#d3d0c8;">(&quot;</span><span style="color:#99cc99;">wss://localhost:8443/ws</span><span style="color:#d3d0c8;">&quot;);
</span></pre>
</div><div class="code-light"><pre style="background-color:#eff1f5;">
<span style="color:#4f5b66;">httplib::ws::WebSocketClient </span><span style="color:#8fa1b3;">client</span><span style="color:#4f5b66;">(&quot;</span><span style="color:#a3be8c;">wss://localhost:8443/ws</span><span style="color:#4f5b66;">&quot;);
</span></pre>
</div>
<h2>次のステップ</h2>
<p>WebSocketの基本がわかりましたね。ここまでで Tourは終わりです。</p>
<p>次のページでは、Tourで取り上げなかった機能をまとめて紹介します。</p>
<p><strong>次:</strong> <a href="../09-whats-next">What's Next</a></p>

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