kennethreitz/requests — pull request #1949 by Lukasa (2014-03-12 18:36:34+00:00)
Title: Pickled Responses should include a None value for the raw attribute

I received [this issue](https://github.com/ionrock/cachecontrol/issues/16) in CacheControl where a pickled response throws an error because there is no raw attribute on the response object. The `__setstate__` function should set this explicitly to an empty `urllib3.response.HTTPResponse`.