How do I "override" Server response header on a ReverseProxied website?
Solution 1:
You can not remove the Server Header in Apache, but in your case, yes you can just show the server tokens of the reverse proxy by adding:
Header unset Server
What this will do is remove the server header returned by the "backend" and show you the one from the reverse proxy.
If by any chance you want to remove or change this header even from the response of the reverse proxy, you will have to use mod_security, or at least that's the only method I know.