[OCS API] Filter content by user not working

According to https://www.freedesktop.org/wiki/Specifications/open-collaboration-services/

It is possible to get the content of a specific user, using the user argument, but it always returns a blank page. (Example: https://api.opendesktop.org/ocs/v1/content/data?user=angelaanne)
The rest of the arguments work correctly.

It looks like you want username:

curl "https://api.opendesktop.org/ocs/v1/content/data?username=angelaanne&pagesize=20"

I had already tried with username and personid but it doesn’t work either, although it gives a result, it is not filtered by user.