an>
     <span class="k">guard</span> <span class="k">let</span> <span class="nv">protocols</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="p">[</span><span class="s">"Upgrade"</span><span class="p">]</span> <span class="k">else</span> <span class="p">{</span>
         <span class="k">do</span> <span class="p">{</span>
             <span class="n">response</span><span class="o">.</span><span class="n">statusCode</span> <span cl