Add websocket support.

bouncer/NginxTemplate.twig

@@ -24,6 +24,12 @@ server {
     proxy_set_header X-Forwarded-For $remote_addr;
     proxy_set_header X-Forwarded-Proto https;
     proxy_set_header Host $host;
+
+    # WebSocket support
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection "upgrade";
+
     proxy_pass  {{ targetPath }};
   }
 }