code: def test_fetch_range_with_headers(dir_server):
      # https://github.com/dask/dask/issues/4479
      root = "http://localhost:8999/"
      fn = files[0]
      headers = {"Date": "Wed, 21 Oct 2015 07:28:00 GMT"}
      f = open_files(root + fn, headers=headers)[0]
      with f as f:
          data = f.read(length=1) + f.read(length=-1)
      with open(os.path.join(dir_server, fn), "rb") as expected:
          assert data == expected.read()
  
imports: from __future__ import annotations
  import os
  import subprocess
  import sys
  import time
  import fsspec
  import pytest
  from fsspec.core import open_files
  from packaging.version import parse
  import dask.bag
  from dask.utils import tmpdir
label_desc: Use image node_id 4 for calling a global function with example usage: test_fetch_range_with_headers(dir_server) without return types