First steps - reverse proxy to external IP

Hi everyone,

I am trying to learn how Traefik works based on a very simple use case. The user calls http://localhost/checkmk and Traefik (running in Docker-Componse on that host) exposes

A lot of solutions I found in Google describe more complicated solutions, so my intention is to first understand the easiest possible use case with an external IP.

Do you know a very basic solution where a working config can be found as a sample?

Many thanks!
Kind regards,

Probably in the documentation