Method modified_send

tests/test_routing.py:806–809

(msg: Message)

        scope[class="st">"add_headers_middleware"] = True

        async def modified_send(msg: Message) -> None:
            if msg[class="st">"type"] == class="st">"http.response.start":
                msg[class="st">"headers"].append((bclass="st">"X-Test", bclass="st">"Set by middleware"))
            await send(msg)

        await self.app(scope, receive, modified_send)