after Rocket.Chat upgrade from v6.1.5 to v7.1.2 reverse proxy on Apache has stopped working.
Before upgrade my Rocket Chat instance url links looked like this: https://mydomain.com/chat/group/mychannel.
My Rocket Chat instance was installed according to this doc:
I have plans to upgrade Rocket Chat and MongoDB to a higher version.
So currently there is no way to use Rocket Chat as a subdirectory? like https://mydomain.com/chat.
Currently, Rocket Chat must have its own subdomain as in the example you provided?
There were a lot of (controversial) changes at 6.5 and more at 7.x
So yes, somewhere there sub directories were quietly dropped. Check the changelogs. But no, unlikely to come back. So a host is required.
As any version is only supported for 6 months (yup annoying as hell) you really need to be on top of upgrades. I usually track one release behind. So currently 7.6.x + and a test on 7.7.x