uWebSockets.js/examples/AsyncFunction.js

/* SSL/non-SSL example with async/await functions */

function delay(t, val) {
  return new Promise(function(resolve) {
      setTimeout(function() {
          resolve(val);
      }, t);
  });
}

async function someAsyncTask() {
  return delay(500, 'Hey wait for me!');
}

const uWS = require('../dist/uws.js');
const port = 9001;

const app = uWS./*SSL*/App({
  key_file_name: 'misc/key.pem',
  cert_file_name: 'misc/cert.pem',
  passphrase: '1234'
}).get('/*', async (res) => {
  /* Can't return or yield from here without responding or attaching an abort handler */
  res.onAborted(() => {
    res.aborted = true;
  });

  /* Awaiting will yield and effectively return to C++, so you need to have called onAborted */
  let r = await someAsyncTask();

  /* If we were aborted, you cannot respond */
  if (!res.aborted) {
    res.cork(() => {
      res.end(r);
    });
  }
}).listen(port, (token) => {
  if (token) {
    console.log('Listening to port ' + port);
  } else {
    console.log('Failed to listen to port ' + port);
  }
});