GUI not usable if LiveConfig is running behind reverse proxy

[Nom-flow]

When running LiveConfig 3 behind a reverse proxy, the web interface fails to stay connected right after installation. The message displayed is:

"Connection to server lost – trying to reconnect..."

/var/log/liveconfig/liveconfig.log:

[5622] [2025-10-08 16:31:59.641210] [ERR] Missing or invalid 'Connection: Upgrade' header
[5622] [2025-10-08 16:32:00.721879] [ERR] Missing or invalid 'Connection: Upgrade' header
[5622] [2025-10-08 16:32:03.694025] [ERR] Missing or invalid 'Connection: Upgrade' header
[5622] [2025-10-08 16:32:08.693953] [ERR] Missing or invalid 'Connection: Upgrade' header
[5622] [2025-10-08 16:32:17.700222] [ERR] Missing or invalid 'Connection: Upgrade' header
[5622] [2025-10-08 16:32:34.711492] [ERR] Missing or invalid 'Connection: Upgrade' header
[5622] [2025-10-08 16:33:05.705776] [ERR] Missing or invalid 'Connection: Upgrade' header

[PhilineGraystone]

Hi, you must configure your proxy with websockets