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  <section id="adding-websockets-support">
<h1>Adding WebSockets support<a class="headerlink" href="#adding-websockets-support" title="Link to this heading">¶</a></h1>
<p>WebSockets is a technology for creating a bidirectional stream-based
channel over HTTP.</p>
<p>To run WebSockets through Varnish you need to pipe the request and copy
the Upgrade and Connection headers as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sub</span> <span class="n">vcl_recv</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">req</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">upgrade</span> <span class="o">~</span> <span class="s2">&quot;(?i)websocket&quot;</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">return</span> <span class="p">(</span><span class="n">pipe</span><span class="p">);</span>
    <span class="p">}</span>
<span class="p">}</span>

<span class="n">sub</span> <span class="n">vcl_pipe</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">req</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">upgrade</span><span class="p">)</span> <span class="p">{</span>
        <span class="nb">set</span> <span class="n">bereq</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">upgrade</span> <span class="o">=</span> <span class="n">req</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">upgrade</span><span class="p">;</span>
        <span class="nb">set</span> <span class="n">bereq</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="n">req</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">connection</span><span class="p">;</span>
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<span class="p">}</span>
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