'Returns the final WSGI response as tuple.  The first item in
the tuple is the application iterator, the second the status and
the third the list of headers.  The response returned is created
specially for the given environment.  For example if the request
method in the WSGI environment is ``\'HEAD\'`` the response will
be empty and only the headers and status code will be present.
.. versionadded:: 0.6
:param environ: the WSGI environment of the request.
:return: an ``(app_iter, status, headers)`` tuple.'

def get_wsgi_response(self, environ):

    headers = self.get_wsgi_headers(environ)
    app_iter = self.get_app_iter(environ)
    return (app_iter, self.status, headers.to_wsgi_list())
