@APIParamsCall
    def show_extension(self, ext_alias, **_params):
        return self.get(self.extension_path % ext_alias, params=_params)
Helper method returnine a L{Deferred} firing with a tuple of a client
dataset/ETHPy150Open openstack/python-group-based-policy-client/gbpclient/v2_0/client.py/Client.show_extension--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/test/test_tcp.py/TCPTransportServerAddressTestMixin.getConnectedClientAndServer