url exists in node - awaitable async ES6 solution, doing a HEAD request

url-exists-head-es6.node.js

//** https://stackoverflow.com/questions/26007187/node-js-check-if-a-remote-url-exists/51757188#51757188


// options for the http request
let options = {
    host: 'google.de',
    //port: 80,  optional
    //path: '/'  optional
}

const http = require('http');

(async () => {

  // creating a promise (all promises a can be awaited)
  let isOk = await new Promise(resolve => {
      // trigger the request ('HEAD' or 'GET' - you should check if you get the expected result for a HEAD request first (curl))
      // then trigger the callback
      http.request({method:'HEAD', host:options.host, port:options.port, path: options.path}, result =>
          resolve(result.statusCode >= 200 && result.statusCode < 400)
      ).on('error', resolve).end();
  });

  // check if the result was NOT ok
  if (!isOk) 
      console.error('could not get: ' + options.host);
  else
      console.info('url exists: ' + options.host);
  
})();