intridea/omniauth — pull request #693 by BRMatt (2013-07-03 10:25:43+00:00)
Title: Splitting dynamic path matching from path generation,

Previously the lambda was responsible for matching the incoming request
path and returning a truthy value, AND returning a string representation
of the callback_path

This breaking change introduces two new callbacks `is_request_path` and
`is_callback_path` which handle the dynamic path matching, and the
original callbacks can be used for path generation.

refs intridea/omniauth#630