code: def test_no_request_host() -> None:
      """It is not safe for the Bokeh codebase to use request.host in any way.
      This test ensures "request.host" does not appear in any file.
  
      """
      errors = collect_errors()
      assert (
          len(errors) == 0
      ), "request.host usage issues:\n" + "\n".join(errors)
  
imports: from __future__ import annotations
  import pytest
  from subprocess import check_output
  from typing import IO
label_desc: Use image node_id 1 for calling a global function with example usage: test_no_request_host() without return types