ローカルサーバーを立ててそこにリクエストするプログラム。

request.js

const http = require('http');
const req = require('request-promise');

const PORT_NUMBER = 8881;

const server = http.createServer();

server.on('request', (req, res) => {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.write('Hello World !2!');
  res.end();
  server.close();
  req.connection.end();
  req.connection.destroy();
});
server.listen(PORT_NUMBER);

req({
  method: 'GET',
  url: `http://localhost:${PORT_NUMBER}`,
  resolveWithFullResponse: true,
})
  .then(res => console.log(res.headers));