code: def hi(self) -> bytes:
      return b"hi"
  
file_path: ray/python/ray/serve/_private/benchmarks/handle_throughput.py
imports: import asyncio
  import logging
  from typing import Tuple
  import click
  from ray import serve
  from ray.serve._private.benchmarks.common import run_throughput_benchmark
  from ray.serve.handle import DeploymentHandle, RayServeHandle
label_desc: Use image node_id 2 for calling the Downstream obj's underlying member method code with example usage: obj.hi() and returns: bytes