After update reverse proxy not working (AH01084 pass request body failed)

Installation & Configuration
1

Hello,
i can’t work on documents in nextcloud and see the folling error in the collabora logfile:

[Fri Sep 23 10:58:53.884502 2022] [proxy:error] [pid 61065] (20014)Internal error (specific information not available): [client 185.203.49.26:54243] AH01084: pass request body failed to 127.0.0.1:9980 (127.0.0.1)
[Fri Sep 23 10:58:53.884559 2022] [proxy:error] [pid 61065] [client 185.203.49.26:54243] AH00898: Error during SSL Handshake with remote server returned by /browser/2674677/cool.html
[Fri Sep 23 10:58:53.884570 2022] [proxy_http:error] [pid 61065] [client 185.203.49.26:54243] AH01097: pass request body failed to 127.0.0.1:9980 (127.0.0.1) from 185.203.49.26 ()

i tried to reinstall collabora 22.05.6-1 on ubtunu 20.04 according to this howto:
https://www.linuxbabe.com/ubuntu/integrate-collabora-onlinenextcloud-without-docker
It previously worked, but probably some server names/ip changed. I also read this:
https://github.com/nextcloud/richdocuments/issues/1904
where it is mentioned, that " /loleaflet has been renamed to /browser and lool to cool"

My collabora apache2-config:

<IfModule mod_ssl.c>
SSLStaplingCache shmcb:/var/run/apache2/stapling_cache(128000)
<VirtualHost *:443>
  ServerName collabora.bbs1emden.de
  Options -Indexes
  ErrorLog ${APACHE_LOG_DIR}/collabora-error.log
  CustomLog ${APACHE_LOG_DIR}/collabora-access.log combined

  AllowEncodedSlashes NoDecode

  ProxyPreserveHost On

  SSLProxyEngine On


  ProxyPass           /browser https://127.0.0.1:9980/browser
  ProxyPassReverse    /browser https://127.0.0.1:9980/browser

  ProxyPass           /hosting/discovery http://127.0.0.1:9980/hosting/discovery retry=0
  ProxyPassReverse    /hosting/discovery http://127.0.0.1:9980/hosting/discovery
  ProxyPass           /hosting/capabilities http://127.0.0.1:9980/hosting/capabilities retry=0
  ProxyPassReverse    /hosting/capabilities http://127.0.0.1:9980/hosting/capabilities


  ProxyPassMatch "/lool/(.*)/ws$" wss://127.0.0.1:9980/lool/$1/ws nocanon


  ProxyPass   /lool/adminws wss://127.0.0.1:9980/lool/adminws

  ProxyPass           /cool https://127.0.0.1:9980/cool
  ProxyPassReverse    /cool https://127.0.0.1:9980/cool
Include /etc/letsencrypt/options-ssl-apache.conf
Header always set Strict-Transport-Security "max-age=31536000"
SSLUseStapling on
SSLCertificateFile /etc/letsencrypt/live/collabora.bbs1emden.de/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/collabora.bbs1emden.de/privkey.pem
</VirtualHost>
</IfModule>

What can i do to track down the error?

2

I moved collabora to a different host (a root server) and it partly woks now. All rewrite rules have to point to http, not https:

ProxyPass           /loleaflet http://127.0.0.1:9980/loleaflet retry=0
ProxyPassReverse    /loleaflet http://127.0.0.1:9980/loleaflet
ProxyPass           /browser http://127.0.0.1:9980/browser retry=0
ProxyPassReverse    /browser http://127.0.0.1:9980/browser

ProxyPass           /hosting/discovery http://127.0.0.1:9980/hosting/discovery retry=0
ProxyPassReverse    /hosting/discovery http://127.0.0.1:9980/hosting/discovery
ProxyPassMatch "/cool/(.*)/ws$" ws://127.0.0.1:9980/cool/$1/ws nocanon
ProxyPass   /cool/adminws ws://127.0.0.1:9980/cool/adminws
ProxyPass           /cool http://127.0.0.1:9980/cool
ProxyPassReverse    /cool http://127.0.0.1:9980/cool

Which makes sense, since the webserver is encrypting.
Access control does not work, but that is a different story.