function https_get(url){
  return new Promise((resolve, reject)=>{
    Https.get(url, (res)=>{
      if(res.statusCode !== 200){ reject(); }
      var response = '';
      res.on('data', (chunk)=>{ response += chunk; });
      res.on('end', ()=>{
        resolve(response);
      });
      res.once('error', ()=>{ reject(); });
    }).once('error', ()=>{ reject(); });
  });
}