jayvdb added a comment.
So after looking at the source (https://github.com/wikimedia/mediawiki/blob/master/includes/filerepo/Foreign...) , here are all the foreign repo props which work
http://mapping.referata.com/w/api.php?action=query&meta=filerepoinfo&...
TASK DETAIL https://phabricator.wikimedia.org/T74847
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To: jayvdb Cc: pywikipedia-bugs, Legoktm, jayvdb