# Used mainly to close files after the request is done, dependencies are closed
# in their own AsyncExitStack
class AsyncExitStackMiddleware:
    def __init__(
        self, app: ASGIApp, context_name: str = "fastapi_middleware_astack"
    ) -> None:
        self.app = app
        self.context_name = context_name

    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
        async with AsyncExitStack() as stack:

    async def app(request: Request) -> Response:
        response: Union[Response, None] = None
        file_stack = request.scope.get("fastapi_middleware_astack")
        assert isinstance(file_stack, AsyncExitStack), (
            "fastapi_middleware_astack not found in request scope"
        )

        # Extract endpoint context for error messages
        endpoint_ctx = (