Simple function to request url using promise. Thanks to https://www.tomas-dvorak.cz/posts/nodejs-request-without-dependencies/

httpPromise.js

const getContent = function(url) {
  
  return new Promise((resolve, reject) => {
    
    // select http or https module, depending on reqested url
    const lib = url.startsWith('https') ? require('https') : require('http');
    
    lib.get(url)
      .on('response', resolve)
      .on('error', reject);
    
  }).then(response => {
    
    return new Promise((resolve, reject) => {
      
      // temporary data holder
      const body = [];

      // on every content chunk, push it to the data array
      response.on('data', chunk => body.push(chunk));
      
      // we are done, resolve promise with those joined chunks
      response.on('end', () => resolve(body.join('')));
      
      response.on('error', reject);
      
    });    
  
  })
  
};