surfly/gevent — pull request #324 by jikamens (2013-10-10 13:36:12+00:00)
Title: start_response: Coerce response headers to list

Since finalize_headers appends values to self.response_headers, it
needs to be a list, but the caller could have passed in another type
of iterable. Therefore, it should be coerced into a list when savede
in self.response_headers.