'Poll Authorization Resource for status.
:param authzr: Authorization Resource
:type authzr: `.AuthorizationResource`
:returns: Updated Authorization Resource and HTTP response.
:rtype: (`.AuthorizationResource`, `requests.Response`)'

def poll(self, authzr):

    response = self.net.get(authzr.uri)
    updated_authzr = self._authzr_from_response(response, authzr.body.identifier, authzr.uri)
    return (updated_authzr, response)
