alswikiquote seems right

try,
http://parsoid-lb.eqiad.wikimedia.org/alswikiquote/Houptsyte?oldid=6180

Yeah, I verified that alswikiquote appears to be set up right in mediawiki.ParsoidConfig and that alswikiquote is the db name in https://en.wikipedia.org/w/api.php?action=sitematrix&format=json

Thank you both for your feedback. Was my error, I apologise. But why http://parsoid-lb.eqiad.wikimedia.org/alswikiquote/ try to open "Main_page" instead of "Houptsyte", which is the configured main page? That's why I made this wrong bug report, the Parsoid backend did not really act logically (to my opinion at least).

That's a valid point. I think most projects have a redirect from Main_page -> the localized name of the main page? If the name of the Main_Page is present in the siteinfo API somewhere, please open a new bug, it wouldn't be hard to change the default page name we use.

should be available in general.mainpage. we can fix that up

I have open a task for this here: https://phabricator.wikimedia.org/T75909