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<h1>Adding WebSockets support<a class="headerlink" href="#adding-websockets-support" title="Permalink to this headline">ΒΆ</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-python"><pre>sub vcl_recv {
if (req.http.upgrade ~ "(?i)websocket") {
return (pipe);
}
}
sub vcl_pipe {
if (req.http.upgrade) {
set bereq.http.upgrade = req.http.upgrade;
set bereq.http.connection = req.http.connection;
}
}</pre>
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