I noticed that 58ef323 introduced html5Mode behaviour changes for determining appbase.

With html5Mode, given an app http://foo/, and a deep link url http://foo/bar/baz that can be reached with ng-href or something within the application, the appbase is /. However if the user goes to http://foo/bar/baz directly, the appbase becomes http://foo/bar, leaving the $$path to be /baz, and this breaks url router or ui-router.