I've found a bad redirect from https→http, maybe there are others.
https://beta.musicbrainz.org/search/textsearch.html → http://beta.musicbrainz.org/search
Example : https://beta.musicbrainz.org/search/textsearch.html?type=label&query=HAHAHA
This looks like it may be a general problem with entries in the mbserver-redirects file. Researching how to fix it...
warp fixed this as part of the move to beta
This looks like it may be a general problem with entries in the mbserver-redirects file. Researching how to fix it...