Function middleware

tests/test_web_exceptions.py:244–249

(request, handler)

async def test_HTTPException_retains_cookie(aiohttp_client: AiohttpClient) -> None:
    @web.middleware
    async def middleware(request, handler):
        try:
            return await handler(request)
        except web.HTTPException as exc:
            exc.set_cookie("foo", request["foo"])
            raise exc

    async def save(request):
        request["foo"] = "works"