How to use the mangum.asgi.ASGICycleState.RESPONSE function in mangum

async def asgi_send(self, message: ASGIMessage) -> None:
        if self.state is ASGICycleState.REQUEST:
            if message["type"] in ("websocket.accept", "websocket.close"):
                self.state = ASGICycleState.RESPONSE
            else:
                raise RuntimeError(
                    f"Expected 'websocket.accept' or 'websocket.close', received: {message['type']}"
                )
        else:
            data = message.get("text")
            if message["type"] == "websocket.send":
                group = message.get("group", None)
                self.send_data(data=data, group=group)

if self.state is ASGICycleState.REQUEST:
            if message["type"] != "http.response.start":
                raise RuntimeError(
                    f"Expected 'http.response.start', received: {message['type']}"
                )

            status_code = message["status"]
            headers = {k: v for k, v in message.get("headers", [])}
            self.response["statusCode"] = status_code
            self.response["isBase64Encoded"] = self.binary
            self.response["headers"] = {
                k.decode(): v.decode() for k, v in headers.items()
            }
            self.state = ASGICycleState.RESPONSE

        elif self.state is ASGICycleState.RESPONSE:
            if message["type"] != "http.response.body":
                raise RuntimeError(
                    f"Expected 'http.response.body', received: {message['type']}"
                )

            body = message.get("body", b"")
            more_body = message.get("more_body", False)

            # The body must be completely read before returning the response.
            self.body += body

            if not more_body:
                body = self.body
                if self.binary:
                    body = base64.b64encode(body)
                self.response["body"] = body.decode()