Merge pull request #3046 from ceocoder/patch-1

docs/source/reference/config-proxy.md

@@ -83,6 +83,7 @@ server {
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
         # websocket headers
+        proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection $connection_upgrade;