Work behind a reverse proxy #4

In my setup, I have caddy v2 as HTTPS terminator in front of iptv-handler running inside a docker container.
iptv-handler should be aware, that is's receiving http traffic but advertise a different port than it's listening to. So it listens on 3001 for HTTP traffic, but advertises as HTTPS on 443.

Right now I cannot forward normal HTTP 2 or HTTP 1.1 traffic to the container, I need to switch to h2c, which produces quite a lot of errors.

PS: Sorry for all the spam :)