@abc.abstractmethod
    def create_router_precommit(self, context, router_context):
        pass
Build up the request data into a bytearray.
dataset/ETHPy150Open openstack/networking-cisco/networking_cisco/plugins/cisco/l3/drivers/__init__.py/L3RouterBaseDriver.create_router_precommit--crossover with--dataset/ETHPy150Open sigmavirus24/requests-toolbelt/tests/test_dump.py/TestResponsePrivateFunctions.test_dump_request_data_with_proxy_info