Unsuccessful Browser client side HTTP redirect checker

code.js

var xhr = new XMLHttpRequest();
xhr.onload = function() {
  if (this.status < 400 && this.status >= 300) {
    console.log('request redirects to ' + this.getResponseHeader("Location"));
  } else {
    console.log('request does not redirect');
  }
}
xhr.open('HEAD', 'https://t.co/Ui4Wmesq1j', true);
xhr.send();