node get multiple https urls and join result

fetch-join-async.js

const https = require('https');
const urls = ['https://postman-echo.com/get','https://httpbin.org/anything'];
Promise.all(urls.map(url => new Promise((resolve,reject) => {
    https.get(url, r => {
      const data = [];
      r.on('data', d => data.push(d));
      r.on('end', () => resolve(Buffer.concat(data).toString()));
    }).on('error',console.log);
  })))
  .then(d => console.log(d.join('')), console.log);