Author Topic: [HAProxy] Issue websocket upgrade connection (Read 365 times)

Foreman21 · « **on:** July 22, 2024, 06:36:18 pm »

Hi,

I curently deploy a application on a K3s cluster.

But ! One of the script make fallowing error

error: unable to upgrade connection: <html><body><h1>502 Bad Gateway<h1>
The server returned an invalid or incomplete response

IT guy of the app company tell me that it's fault of reverse proxy.

In this case I am using HAProxy module for OPNsense.
HAProxy module is new to me.

I checked logs without result.

I checked all setting of Public server. No option related.

I tried to set advenced frontend/backend configuration.

Code: [Select]

frontend http-in
  acl is_websocket hdr(Upgrade) -i WebSocket
  acl is_websocket hdr_beg(Host) -i ws
  use_backend websocket-backend if is_websocket

backend websocket-backend
    server ws1   x.x.x.x check

It totaly screwed up my config.

I am running in version OPNsense 24.1.6-amd64.

Can you provide me advice about were I need to look at.

Regards.
Foreman21.