Hello, I have an ISPC server with apache2. I run nextcloud on one virtualhost and try to setup a notify_push server for that nextcloud. This notify_push server is a binary running with systemd which is reachable thanks to a websocket proxy. So that I put in related ISPC website apache_directive : Code: ProxyRequests Off ProxyPreserveHost On <Proxy *> Require all granted </Proxy> ProxyPass /push/ws ws://127.0.0.1:50004/ws ProxyPass /push/ http://127.0.0.1:50004/ ProxyPassReverse /push/ http://127.0.0.1:50004/ But, unfortunately, testing it with appropriate process it gives Code: [2022-10-14 23:00:40.757570 +02:00] INFO [test_client] test_client/src/main.rs:29: Found push server at wss://mync.tld/push/ws Error: × Can't connect to server ├─▶ WebSocket protocol error: Missing, duplicated or incorrect header sec-websocket-key ╰─▶ Missing, duplicated or incorrect header sec-websocket-key I am almost convience that's an apache2 issue I see in my log Code: [Fri Oct 14 21:53:04.773790 2022] [proxy:error] [pid 3240304:tid 139890524133120] (9)Bad file descriptor: [client IPhidden] AH03307: ap_proxy_transfer_between_connections: error on sock - ap_pass_brigade Any idea of what to do ?