code: def test_basic(self, serve_instance):
      @serve.deployment
      class Model:
          def __call__(self) -> int:
              request_id = (
                  ray.serve.context._serve_request_context.get().request_id
              )
              assert request_id == "123-234"
              return 1
  
      serve.run(Model.bind())
      self.verify_result()
  
file_path: ray/python/ray/serve/tests/test_http_headers.py
imports: import uuid
  import pytest
  import requests
  import starlette
  from fastapi import FastAPI
  import ray
  from ray import serve
label_desc: Use image node_id 2 for calling the TestUserProvidedRequestIDHeader obj's underlying member method code with example usage: obj.test_basic(serve_instance) and returns: int