this is what I have in my ssl.conf
Redirect /
https://real-domain/console
ProxyPreserveHost on
ProxyPass /console
https://backend:<port>/console
ProxyPassReverse /console
https://backend:<port>/console
I've forgotten that SSL Configurations should be put inside ssl.conf and not httpd.conf.
That was where the error came from, once putting into ssl.conf, everything solves.
Now i'm cracking my head on how to make HTTPS listen to one IP only, but with several domain names, any idea?