http://musicbrainz.org/ws/2/recording/8d8f94eb-d7be-46f7-9b01-4ec81a449e09?inc=puids and http://musicbrainz.org/ws/2/release/b3b7e934-445b-4c68-a097-730c6a6d47e6?inc=discids+puids+recordings work perfectly fine.