# pydantic v1
            response_content = _prepare_response_content(
                response_content,
                exclude_unset=exclude_unset,
                exclude_defaults=exclude_defaults,
                exclude_none=exclude_none,
            )
        if is_coroutine:
            value, errors_ = field.validate(response_content, {}, loc=("response",))
        else:

        ] = None,
        lifespan: Annotated[
            Optional[Lifespan[AppType]],
            Doc(
                """
                A `Lifespan` context manager handler. This replaces `startup` and
                `shutdown` functions with a single context manager.

                Read more in the
                [FastAPI docs for `lifespan`](https://fastapi.tiangolo.com/advanced/events/).
                """