code: def maybe_parse_bearer_header(value: str) -> Optional[str]:
      if value.startswith(BEARER):
          return value[len(BEARER) :]
      return None
  
imports: import abc
  import asyncio
  import logging
  import urllib.parse
  from functools import wraps
  from typing import Awaitable, Callable, Optional, Tuple, TypedDict
  import aiohttp
  import aiohttp_session
  from aiohttp import web
  from hailtop import httpx
  from hailtop.config import get_deploy_config
  from hailtop.utils import retry_transient_errors
  from .time_limited_max_size_cache import TimeLimitedMaxSizeCache
label_desc: Use image node_id 1 for calling a global function with example usage: maybe_parse_bearer_header(value) and returns: None, value