Replace host HA Proxy

[Erdenkind]

Hello,

I am brand new on the HA Proxy configuration via GUI of OPNsense. So please describe it for a novice:

I do have a webserver listening on https://test.testdom.com. Everything works fine. Question:

How to configure HAProxy accepting https://www.extrnldom.com from the Webbrowser, rewriting the Host in the URL, so that we do have some kind of masquerading for the host-Part.