facebook/tornado — pull request #570 by ewdurbin (2012-07-22 16:54:17+00:00)
Title: Allow 'oob' as a callback_uri per OAuth spec section 2.1

OAuth spec allows for 'oob' as a value for oauth_callback.

This change allows for this to pass through rather than being concatenated into an actual URL

http://tools.ietf.org/html/draft-hammer-oauth-08#section-2.1