code: def req():
      r = jina_pb2.DataRequestProto()
      r.header.request_id = random_identity()
      r.data.docs.docs.add()
      return r
  
imports: import copy
  import pytest
  from docarray import Document, DocumentArray
  from google.protobuf.json_format import MessageToDict, MessageToJson
  from jina.excepts import BadRequestType
  from jina.helper import random_identity
  from jina.proto import jina_pb2
  from jina.proto.serializer import DataRequestProto
  from jina.types.request.data import DataRequest, Response
label_desc: Use image node_id 1 for calling a global function with example usage: req() and returns: r