facebook/phabricator — pull request #108 by csilvers (2012-05-03 17:42:18+00:00)
Title: Don't require the user to be logged in to give a 404 response.

Boy were we confused why the login screen kept showing up for a
particular url! We never would have guessed it's because it was a
404...

(Sorry I'm not using phabricator to do this review, but I can't get it working yet...)