Files

AnotherOne.js

// this is another one

frontEnd-download.js

var request = new XMLHttpRequest();
request.open('POST', $someUrl, true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.responseType = 'blob';

request.onload = function() {
  // Only handle status code 200
  if(request.status === 200) {
    // Try to find out the filename from the content disposition `filename` value
    var disposition = request.getResponseHeader('content-disposition');
    var matches = /"([^"]*)"/.exec(disposition);
    var filename = (matches != null && matches[1] ? matches[1] : 'file.pdf');

    // The actual download
    var blob = new Blob([request.response], { type: 'application/pdf' });
    var link = document.createElement('a');
    link.href = window.URL.createObjectURL(blob);
    link.download = filename;

    document.body.appendChild(link);

    link.click();

    document.body.removeChild(link);
  }

  // some error handling should be done here...
};

request.send();