No integrated Traefik middleware for that. You can check the list of plugins for Traefik.

I doubt that it will be that easy, because you will have multiple requests for dependencies, which might not include the initial query param or header, so you probably need to establish a session with a cookie.

Maybe try with ForwardAuth again, I just created a test setup with a dummy node.js auth container, maybe you can adapt that for your requirements and add a session cookie.