'Makes a copy of the response'

def copy(self):

    app_iter = list(self._app_iter)
    iter_close(self._app_iter)
    self._app_iter = list(app_iter)
    return self.__class__(content_type=False, status=self._status, headerlist=self._headerlist[:], app_iter=app_iter, conditional_response=self.conditional_response)
