Cant use reverse proxy

I am not sure if a fix is possible as I am sure its webtop but I get an error while trying to use traefik reverse proxy. I know this is related to kasmvnc as I have kasm setup and inorder to use kasm with a reverse proxy there are kasm setting that need to be set to use a reverse proxy otherwise you get the 400 bad request error code.

Just wondering if anyone has a fix for this.