function getProtocol (req) {
  var proto = req.connection.encrypted ? 'https' : 'http';
  // only do this if you trust the proxy
  proto = req.headers['x-forwarded-proto'] || proto;
  return proto.split(/\s*,\s*/)[0];
}

new Promise((resolve, reject) => {
  let stream = request({
    uri: 'https://192.168.1.100:3000/config/properties.js',
    headers: {
      'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8',
      'Accept-Encoding': 'gzip, deflate, br',
      'Accept-Language': 'en-US,en;q=0.9,fr;q=0.8,ro;q=0.7,ru;q=0.6,la;q=0.5,pt;q=0.4,de;q=0.3',
      'Cache-Control': 'max-age=0',
      'Connection': 'keep-alive',
      'Upgrade-Insecure-Requests': '1',
      'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'
    },
    gzip: true
  })
    .pipe(file)
    .on('finish', () => {
      resolve();
      console.log('The file finished downloading');
    })
    .on('error', (error) => {
      reject(error);
    })
})
.catch(error => {
  console.log('Something happened: ', error);
})