maybe it is usefull for your problem.
description of my installation:
- debian bullseye
- Apache
- php 8.0
- nextcloud 24
behind FireWall - OpnSense
ReverseProxy based on apache with Let’s entcrypt (on Raspberry)
I had the same error “collabora should use the same protocol as the server” and solved this with the follow entry in the ReverseProxy config.
sorry, i can’t show you my config, because i am a new user and i am can post only four links ;(
i found this in (document-server-proxy/proxy-https-to-http.conf at master · ONLYOFFICE/document-server-proxy · GitHub) line 40 - 47
Best regards
Winux