kickstarter/rack-attack — pull request #45 by wkimeria (2014-02-28 22:42:16+00:00)
Title: For rate-limiting, if back-end store is down, provide an option to not rate limit (default is to rate limit)

Currently, if the back-end store is down, all requests are rate-limited (because Exceptions bubble up). Added a parameter that allows requests through if the back end is down or throws an exception. This is specific to Throttling.