Replicating website release groups query

MusicBrainz Development
1

If I search for an artist’s release groups like so:

https://musicbrainz.org/ws/2/release-group?artist=f22942a1-6f70-4f48-866e-238cb2308fbd&limit=100&fmt=json

I get a lot of junk. If I browse the website at https://musicbrainz.org/artist/f22942a1-6f70-4f48-866e-238cb2308fbd, it seems to only display a subset of the release groups. What requests do I have to make to replicate this?

At the bottom of the page it’s possible to switch between showing all release-groups or just official ones. I assume ‘Official’ means that one of the releases in that release group has official status. Is there any way of getting these release groups only?

2

I figured it out, I had to add release-group-status=website-default, e.g

https://musicbrainz.org/ws/2/release-group?artist=f22942a1-6f70-4f48-866e-238cb2308fbd&limit=100&release-group-status=website-default&fmt=json

3

Wow! this looks like an undocumented feature.
Where did ou find it?

Update, I found it there, it’s a Browse, not a Search.