Hey,

I will try my best to describe my case:
I have 2 almost similar local servers (e.g. 10.0.0.1 and 10.0.0.2, both behind a pfsense firewall) and currently all web traffic (http and https) is directed to the 10.0.0.1 server running Apache2 with multiple vhosts.

These vhosts can be accessed either through a subdomain (e.g. alpha.myserver.net) or through a domain (e.g. beta.net), depending on the customer.

Now I want to move some vhosts (i.e. a few domains and subdomains) to the second server while the domains are still accessible with the same public IP, so I probably need a reverse proxy.

My question now is, is it possible to set up a reverse proxy that acts like a switch and checks the domain name and then decides if it belongs to the 10.0.0.1 or the 10.0.0.2 server without interrupting https?

I guess a combination of RewriteCond and RewriteRule with a [P] flag can do it. Canonical Hostnames describes redirecting, but reverse proxy should be similar.