- It is now possible to control how the Pyramid router calls the WSGI

  ``start_response`` callable and obtains the WSGI ``app_iter`` based on
  adapting the response object to the new ``pyramid.interfaces.IResponder``
  interface.  The default ``IResponder`` uses Pyramid 1.0's logic to do this.
  To override the responder::

     from pyramid.interfaces import IResponder
     from pyramid.response import Response
     from myapp import MyResponder

     config.registry.registerAdapter(MyResponder, (Response,),
                                     IResponder, name='')

  This makes it possible to reuse response object implementations which have,
  for example, their own ``__call__`` expected to be used as a WSGI
  application (like ``pyramid.response.Response``), e.g.:

     class MyResponder(object):
         def __init__(self, response):
             """ Obtain a reference to the response """
             self.response = response
         def __call__(self, request, start_response):
             """ Call start_response and return an app_iter """
             app_iter = self.response(request.environ, start_response)
             return app_iter

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