In Virtualmin, I've read that you can setup a proxy website under a subdomain.
All traffic on port 80 hits Apache where there are multiple virtual servers sharing the internal server IP.
I have a separate machine, a Raspberry Pi3 running a web service on port 8123.
If I create a subdomain.mydomain.com, can I get Apache to load the http://internalip:8123 site and send it to the requestor?
Is this what a reverse proxy is?