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# inspired by http://serverfault.com/questions/370890/best-way-to-deploy-my-node-js-app-on-a-varnish-nginx-server/371008#371008 #
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# to use the signaling server behind a varnish cache server you need to define a backend for it

backend nodejs {
    .host = "127.0.0.1";
    #.host = "148.251.154.68";
    .port = "4500";
}


# and also some modifications in vcl_recv

if (req.http.Upgrade ~ "(?i)websocket") {
  set req.backend = nodejs;
  return (pipe);
}
if (req.http.host == "chat.lookshe.org") {
  if (req.url ~ "^/socket.io/") {
    set req.backend = nodejs;
    return (pipe);
  }
}


# and at least vcl_pipe

sub vcl_pipe {
   #Need to copy the upgrade for websockets to work
   if (req.http.upgrade) {
      set bereq.http.upgrade = req.http.upgrade;
   }
   set bereq.http.Connection = "close";
   return (pipe);
}