WSGIContainer's start_response method is incorrect

[jkp]

The prototype for a start_response method is as follows:

def start_response(status,response_headers,exc_info=None):

See here: http://www.python.org/dev/peps/pep-0333/#the-start-response-callable.

The version in Tornado does not take the exc_info parameter meaning it is not possible to run a number of middlewares under it. It's an easy one to fix though :)

[bdarnell]

Fixed in commit 1ae186a