回答问题，
换取可调用的 API。

<script src="/assets/sdk.js"></script>
<script>
  (async () => {
    const app = DTNSAgent.app({
      domain: 'agent-xxxx.html.dtns.top'
    });

    app.get('/hello', (req, res) => {
      res.json({ ok: true, query: req.query });
    });

    app.post('/echo', (req, res) => {
      res.status(201).json({ body: req.body });
    });

    await app.listen();
  })();
</script>

const DTNSAgent = require('./sdk.js');
const WebSocket = require('ws');

(async () => {
  const app = DTNSAgent.app({
    domain: 'agent-xxxx.html.dtns.top',
    WebSocket
  });

  app.get('/hello', (req, res) => {
    res.json({ ok: true });
  });

  await app.listen();
})();

app.use((req, res, next) => {
  res.set('x-demo', '1');
  next();
});

app.get('/users/:id', (req, res) => {
  res.json({ id: req.params.id, query: req.query });
});

app.ws('/live/:room', (ws, req) => {
  ws.send('welcome ' + req.params.room);

  ws.on('message', (data, isBinary) => {
    // data: string (text) / Uint8Array (binary)
    ws.send(data, isBinary);
  });

  ws.on('close', (code, reason) => {
    console.log('closed', code, reason);
  });
});

await app.listen();
// ws://agent-xxxx.html.dtns.top/live/room1