code: 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()
docs: 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.