http://google.com -> http://google.com
http://google.com/ -> http://google.com
http://google.com/a -> http://google.com
http://google.com/a/ -> http://google.com/a
http://domain.com/subdir/ -> http://domain.com/subdir
http://domain.com/subfile.extension -> http://domain.com
http://domain.com/subfilewithnoextension -> http://domain.com