On private wikis (login only) attempting to read the /api.php?action=rsd which EditURI points to returns an readapidenied error, to make matters worse this error is actually a HTML document. As a result API discovery doesn't work on private wikis, even though the API is usable even on private wikis (ie: if you use action=login).
RSD information isn't private information so we should simply change it so that it's publicly readable.
Version: 1.23.0
Severity: normal