Unifi Controller "400 Bad Request" behind HAProxy
I'm hoping someone can assist me in resolving an error I'm seeing while trying to access my Unifi Controller (v5.12.72) via reverse proxy (HAProxy 0.60_4). When I try to access the Unifi controller, I get to the Login screen but when I log in the controller throws up a 400 Bad Request Error. I don't have any issues accessing the controller from my local network nor do I have any issues accessing other sites I have running through HAProxy. Config for Frontend and Backend for Unifi is the same as for other Sites I've got set up. Any assistance would be greatly appreciated.