Hey @cnic023. Welcome to the forum and thanks for the info. 
(I’m moving this thread to the “Installation & Configuration” section for more visibility.)
Hmmm… I see you have:
- Nextcloud 26.0.13
- NextcloudOffice 8.0.10
Nextcloud 26 is currently listed as “Unsupported”.
Q1. Any chance you could update to Nextcloud 27+?
I see you also mentioned it broke on:
- 2024/04/25
Soo… According to these richdocuments release dates/notes, that may have landed you somewhere between:
- Nextcloud Office 8.0.9 / 8.0.8
Q2. Do you happen to remember:
- Which working version you had previously?
Q3. Also, would be helpful knowing:
- Which OS you are running?
- What Collabora Office version is installed?
Edit: While searching for your:
"error reading status line from remote server" Collabora
I also ran across a few other older topics with Apache + reverse proxy issues… perhaps something there might help too:
Hmmm… but since it was working fine, and broke within the past week… hmmm…