Problems with Proxy Provider.

[DenuxPlays]

Hey,
I have a self-hosted movie-web instance which I wanna put behind authentik to "secure" the service.
I use caddy as a webserver and this is my current configuration:

https://mw.hidden:443 {
    reverse_proxy https://prov.hidden:443 {
        header_up Host {http.reverse_proxy.upstream.hostport}
        header_up X-Real-IP {http.request.remote.host}
        header_up X-Forwarded-For {http.request.remote.host}
        header_up X-Forwarded-Proto {http.request.scheme}
    }
}

But the problem is that nothing is loading.
I can login but then Movie-Web shows some problem and when I refresh I am back at my login screen.
As for authentik I simply use a forward-auth with nothing else configured.