class_docstr: start_response() callable as defined in PEP 3333
code: def __call__(
      self,
      status: str,
      headers: list[tuple[str, str]],
      exc_info: _OptExcInfo | None = ...,
      /,
  ) -> Callable[[bytes], object]:
      ...
  
imports: from collections.abc import Callable, Iterable, Iterator
  from types import TracebackType
  from typing import Any, Protocol, TypeAlias
label_desc: Use image node_id 1 for calling the StartResponse obj's underlying member method code with example usage: obj.__call__() without return types