myapp.example.com:8080
To make this all work, we need few other components apart from RPLB: Router and DNS Server. I'll describe my setup where I have a Raspberry Pi running Home Assistant and AdGuard Home acting as a DNS Server.
We can use this example from AdGuard Home. Similar exists for Pi-hole.
The important thing here is to point the Primary DNS on your Router to the IP adress of DNS Server.
Additionally if we use ... DHCP Reservation
Describe how Router has to point to Home Assistant as DNS Server.
Describe how it works together with Home Assistant + AdGuard Home setup
We need to take advantage of DNS filtering, specifically DNS rewrites
https://adguard-dns.io/kb/general/dns-filtering/
https://adguard-dns.io/kb/general/dns-filtering-syntax/#dnsrewrite-modifier
DNS rewrites - Allows to easily configure custom DNS response for a specific domain name.
AdGuard Home has a page where you can do this.
ports 80 and 443 are taken by NGINX Home Assistant SSL proxy
Running this will result in Settings warning Unsupported system - Unsupported software
https://www.home-assistant.io/more-info/unsupported/software
Reverse proxy extracts host name from the incoming request and tries to find frontend with the same name. On success, reverse proxy finds a backend url connected to that frontends associated backend pool.