Description Erik Damrose 2022-07-19 17:06:14 CEST

Happens e.g. with kopano-core

When installing an app using the portal / appcenter umc module, the installation progress is interrupted when apache2 is restarted during the installation process, for example by a package postinst.

A popup notification is shown:

"An error occurred while connecting to the server, please try again later."

The popup can be exited by clicking on OK. In the background, the app installation continues. This leads to a bad user experience: If the popup is closed, the app center module session is not updated, so the option to install the app is still shown in the module. When trying to install the app again, it is not possible, because the wizard informs that it is already installed on the server. The app center module has to be closed and reopened.
The UCS 4.4 frontend can handle this installation and completes the app installation.

The failing request:
curl 'http://10.200.29.50/univention/command/appcenter/progress' \
  -H 'Accept: application/json; q=1.0, text/html; q=0.3; */*; q=0.1' \
  -H 'Accept-Language: en-US' \
  -H 'Cache-Control: no-cache' \
  -H 'Connection: keep-alive' \
  -H 'Content-Type: application/json' \
  -H 'Cookie: UMCSessionId=e558b0c6-61d9-4b57-b2ba-3db90b0d995c; UMCLang=en-US; _pk_id.14.d08f=2d2e693bcef55dc9.1658157405.; _pk_ses.14.d08f=1' \
  -H 'Origin: http://10.200.29.50' \
  -H 'Pragma: no-cache' \
  -H 'Referer: http://10.200.29.50/univention/management/?header=try-hide&overview=false&menu=false' \
  -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36' \
  -H 'X-Requested-With: XMLHttpRequest' \
  -H 'X-XSRF-Protection: e558b0c6-61d9-4b57-b2ba-3db90b0d995c' \
  --data-raw '{"options":{"progress_id":227996}}' \
  --compressed

Status shown in browser console:
(failed)net::ERR_CONNECTION_RESET