Version >= 25.4.202 "Document loading failed" with Firefox if http/2 is enabled

[slu-010101]

Hi,

after update to CODE version greater than 25.4.202 with enabled http/2 Firefox (143,144) is not longer able to open office documents.

This works without issue with Chromium 141.0.7390.107 and enabled http/2.

As soon I disable http/2 on the Apache2 web server (verified with curl) Nextcloud/CODE is able to open documents again.

Nextcloud 31.0.10
Nextcloud 32.0.1
CODE 25.4.504
Nextcloud Office 9.0.1

[slu-010101]

Not sure this is relevant, but here seams Chrome has the issue, maybe Firefox changed now to?
CollaboraOnline/online#12155

[cmeh]

I can still open documents with Nextcloud Office in Firefox, but would like to confirm the problem of a distorted document view and a low, near unusable performance in Firefox for a wider range of Firefox/richdocuments/richdocumentscode combinations (I'm unsure whether this issue or #325 is the better place to report it).

I can reproduce the problem on several Nextcloud instances w/

• Nextcloud 32.0.3.2
• Nextcloud Office (richdocuments) 9.0.2
• CODE server (richdocumentscode) 25.04.7.2
• Debian 11 to 13 with apache2 and php8.3-fpm

Opened documents appear in Firefox as blank or sometimes just tiled excerpts of the document content are visible. The cursor appears off-positioned and typed text is either not displayed at all (although added to the document) or just every third or fourth character is displayed, and even that stops after a few seconds of typing.

All Firefox versions that I've tested are affected:

• Firefox 140.6.0esr
• Firefox 115.31.0esr
• Firefox 146.0

Deactivating http2 on the server side - thank you, @slu-010101, for this hint - apparently works around the problem:

root@server / # apache2ctl -M | grep http2
 http2_module (shared)
 proxy_http2_module (shared)
root@server / # sudo a2dismod proxy_http2
Module proxy_http2 disabled.
To activate the new configuration, you need to run:
  systemctl restart apache2
root@server / # sudo a2dismod http2
Module http2 disabled.
To activate the new configuration, you need to run:
  systemctl restart apache2
root@server / # systemctl restart apache2
root@server / #