I just read UK’s changelogs , especially the previous version (three days ago) is interesting:
Caution
If you are using a reverse proxy, the security fix may cause connection issue to the WebSocket server. You should add
ProxyPreserveHost on
in your<VirtualHost>
for Apache, andproxy_set_header Host $host;
for Nginx. Read more: #4210 (comment)
That explains why it was not in your first tip!
OK