code: def __init__(
      self, preprocessor: DeploymentHandle, downstream: DeploymentHandle
  ):
      self._preprocessor = preprocessor
      self._downstream = downstream
  
file_path: ray/doc/source/serve/doc_code/model_composition/response_by_reference_example.py
imports: import asyncio
  from typing import List
  import ray
  from ray import ObjectRef
  from ray import serve
  from ray.serve.handle import DeploymentHandle, DeploymentResponse
label_desc: Use image node_id 1 to create a new Ingress object  with example: obj = Ingress(preprocessor, downstream)