title: HaProxy ProxyProtocol and Varnish not respond
body: <p>I have an HaProxy that accept-proxy connection</p>
  <pre><code>frontend f1
      bind *:443 accept-proxy
      default_backend http_varnish
  </code></pre>
  <p>and, in the same instance, I have varnish</p>
  <pre><code>backend http_varnish
     mode http
     balance roundrobin
     server varnish *:6081 check
  </code></pre>
  <p>The problem is that varnish is unresponsive and times out.
  I try to open another port in varnish</p>
  <pre><code>#varnish
  ..... -a :6088,PROXY -T .......
  </code></pre>
  <p>I can't understand why, if as a backend I send requests directly to apache it works correctly, while varnish is not responding.</p>
  <p>Obviously if I remove the accept-proxy, and don't use the proxy protocol, varnish works fine.</p>