Last modified: 2014-07-31 07:30:58 UTC
For example [[Special:RecentChangesLinked/InvalidFooBarTitle]]. It has been observed on zhwiki that some search engine indexed pages with spam contents as "InvalidFooBarTitle". I guess it's because some spammers fed them to search engines deliberately. Sending 404s for them may resolve this with no harm.
Change 148965 had a related patch set uploaded by Liangent: Send 404 in various special pages when there're no results https://gerrit.wikimedia.org/r/148965
Change 148965 merged by jenkins-bot: Send 404 in various special pages when there're no results https://gerrit.wikimedia.org/r/148965
Status: Merged