code: def request_id(self, request_id: t.Optional[int]) -> None:
      self._request_id_var.set(request_id)
  
imports: from __future__ import annotations
  import contextlib
  import contextvars
  import os
  import typing
  from abc import ABC
  from abc import abstractmethod
  from typing import TYPE_CHECKING
  import attr
  import starlette.datastructures
  from .utils.http import Cookie
label_desc: Use image node_id 5 for calling the _ServiceTraceContext obj's underlying member method code with example usage: obj.request_id(request_id) without return types