Argon2 with HTTP (doesn't work)

argon2_http_server.js

'use strict';
const argon2 = require('argon2');
const http = require('http');

function argon() {
  return argon2.generateSalt().then(salt => {
    console.log('SALT: ', salt);
    return argon2.hash('some@test.com', salt).then(hash => {
      console.log('HASH: ', hash);
      return argon2.verify(hash, 'some@test.com');
    });
  });
}

http.createServer(function (req, res) {
  argon().then(function () {
    res.send('ok');
  })
}).listen(3000);