websocket forward proxy server

async function websocket(url, final) {
  let resp = await fetch(url, {
    headers: {
      Upgrade: 'websocket',
      "NDCDEVICEID": await getDeviceId(),
      "NDC-MSG-SIG": await getSignature(final)
    },
  });

  console.log(resp);

  let ws = resp.webSocket;
  if (!ws) {
    throw new Error("server didn't accept WebSocket");
  }

  ws.accept();

 
}

export default {
  async fetch(request, env, ctx) {
    const upgradeHeader = request.headers.get('Upgrade');
    if (upgradeHeader && upgradeHeader.toLowerCase() === 'websocket') {
      const [client, server] = Object.values(new WebSocketPair());
      const device_id = await getDeviceId();
      const timestamp = new Date().getTime();
      const final = `${device_id}|${timestamp}`;
      const url = `http://ws1.aminoapps.com/?signbody=${final.replace('|', '%7C')}`;

      console.log(url);

      websocket(url, final);

      server.accept();
      server.addEventListener('message', async (event) => {

        console.log('Client:', event.data);

        server.send(`Echo: ${event.data}`);
      });

      return new Response(null, {
        status: 101,
        webSocket: server
      });
    }