Exposing the UniFi Network Controller via a Traefik (v2) reverse proxy

This is about my WiFi network set-up with Ubiquiti Access Points (AP’s) in a home situation, but without having (or wanting) physical hardware for running the Unifi Network Controller software on premise (required for set-up and management purposes). The software is therefore running as a container on a Virtual Machine in the Microsoft Azure cloud and AP’s are adopted by it via the ‘Layer 3 Adoption for Remote Unifi Controllers’ method. Because running the Unifi Network Controller web UI with a proper (valid and auto-renewing) LetsEncrypt web certificate and working websocket connections wasn’t trivial after all, that’s what I’m sharing in this article.