Create combined stream

Websocket
1

If I create a raw string I can create the generic stream and then subscribe to a stream:

let ws = new WebSocket(`wss://stream.binance.com:9443/ws`);
....
ws.on("open", async () => {
  ws.send(
    JSON.stringify({
      method: "SUBSCRIBE",
      params: ["btcusdt@aggTrade"],
      id: 1,
    })
  );
});

I want to do the same thing with a combined string, first create the generic stream and then subscribe to stream. I tried in different way but it doesn’t work:

let ws = new WebSocket(`wss://stream.binance.com:9443/stream/${listenKey}`);
let ws = new WebSocket(`wss://stream.binance.com:9443/stream?streams=/${listenKey}`);
2
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