Hello,
Is your feature request related to a problem? Please describe.
I was using Caddy reverse proxy and i decided to give a try to traefik and netbird-proxy.
I was exposing certain (legacy) application like my old asustor nas, and this old device don’t support HTTP2.
Describe the solution you’d like
It could be a good idea to be able to chose HTTP1, HTTP2, HTTP2 TLS and so on when we setup either an individual reverse proxy service, either globally for the whole server.
Describe alternatives you’ve considered
I considered reverting to caddy, but then for not, i kept netbird. 
Best regards,