I am working on setting up Traefik to route to an application that uses websockets. The routing is working in some cases and if a user is behind a HTTPS proxy then I am seeing 403 BlockWebsockets error. I am not sure if user's proxy is blocking the request but the same user is able to use another application that is behind nginx that uses websockets with out any issues.
I saw a suggestion to set CORS headers on the response which I am trying to do and I am able to set headers on the https response but not on WSS
These are the labels from the docker-compose file
traefik.frontend.entryPoints: "https"
traefik.frontend.headers.customResponseHeaders: "Access-Control-Allow-Methods:GET, POST, OPTIONS, PUT||Access-Control-Allow-Origin:*"