is_body_form = body_field and isinstance(body_field.field_info, params.Form)
    if isinstance(response_class, DefaultPlaceholder):
        actual_response_class: Type[Response] = response_class.value
    else:
        actual_response_class = response_class

    async def app(request: Request) -> Response:
        response: Union[Response, None] = None
        async with AsyncExitStack() as file_stack: