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

Hey! Had the same issue last week. Turns out my backend server wasn’t resolving the hostname "backend" from the apache reverse proxy. Try replacing `backend` with the actual IP in your ProxyPass directives.

Also, check if mod_proxy and mod_proxy_http are enabled:
```
a2enmod proxy
a2enmod proxy_http
```

For multi-domain setups, DigitalOcean’s guide is solid. Helped me big time.