code: def test_client_grpc_kwargs(flow_with_grpc):
      with flow_with_grpc:
          client = Client(
              port=flow_with_grpc.port,
              host="localhost",
              protocol="grpc",
          )
  
          meta_data = (("rpc-auth-header", "invalid_access_key"),)
  
          try:
              client.post(
                  "", random_docs(1), request_size=1, metadata=meta_data
              )
          except Exception as exc:
              assert (
                  "Invalid access key detected, got invalid_access_key"
                  in repr(exc)
              )
  
file_path: jina/tests/integration/clients_extra_kwargs/test_clients_post_extra_kwargs.py
imports: import grpc
  import pytest
  from jina import Flow
  from jina.clients import Client
  from jina.serve.helper import get_server_side_grpc_options
  from jina.serve.runtimes.gateway.grpc import GRPCGateway
  from tests import random_docs
label_desc: Use image node_id 2 for calling a global function with example usage: test_client_grpc_kwargs(flow_with_grpc) without return types