Method websocket_connect

starlette/testclient.py:655–676

(
        self,
        url: str,
        subprotocols: Sequence[str] | None = None,
        **kwargs: Any,
    )

        )

    def websocket_connect(
        self,
        url: str,
        subprotocols: Sequence[str] | None = None,
        **kwargs: Any,
    ) -> WebSocketTestSession:
        url = urljoin("ws://testserver", url)
        headers = kwargs.get("headers", {})
        headers.setdefault("connection", "upgrade")
        headers.setdefault("sec-websocket-key", "testserver==")
        headers.setdefault("sec-websocket-version", "13")
        if subprotocols is not None:
            headers.setdefault("sec-websocket-protocol", ", ".join(subprotocols))
        kwargs["headers"] = headers
        try:
            super().request("GET", url, **kwargs)
        except _Upgrade as exc:
            session = exc.session
        else:
            raise RuntimeError("Expected WebSocket upgrade")  # pragma: no cover

        return session

    def __enter__(self) -> Self:
        with contextlib.ExitStack() as stack: