[b]"How to properly configure an Apache reverse proxy for multiple domains?"[/b] or [b]"Apache reverse proxy setup

Yo, DNS could totally be the culprit. If you’re using container names (like Docker) or local hostnames, the apache reverse proxy might not resolve them.

Try pinging `backend` from the proxy server. If it fails, either use IPs or tweak your `/etc/hosts`.

Also, this tool’s handy for testing proxy configs: https://httpd.apache.org/docs/trunk/mod/mod_proxy.html