jgraichen/omniauth-multipassword — pull request #1 by cmaloney (2013-03-18 08:28:40+00:00)
Title: Allow more complex hosting situations (sub uri)

callback_path doesn't contain bits like the sub uri at which an app is hosted (such as at '/foo'). callback_url is callback_path with bits like that added in, making the use case "just work"