server.js

import {Server} from 'http';

const server = new Server();
server.listen(8080);
server.on('request', async function (req, res) {
  req.pause();
  res.statusCode = 200;
  req.on('end', () => res.end('OK'));
  
  const length = message.headers['content-length'];
  const chunk = length / 100;
  for (let i = 0; i < length; i++) {
    await new Promise(res => setTimeout(res, 250));
    req.read(chunk);
  }
})