CORS XMLHttpRequest fails in IE10-11 web worker

There are several possible work-arounds to this problem, two of which I explored:

Option 1

function callXHR() {  var xhr = new XMLHttpRequest();  //this will redirect to 'https://s3.amazon.com/...'  xhr.open('GET', 'https://example.com/document/1234/download');  xhr.send(null);}if(isIE) {   //callXHR in main js file} else {   //callXHR in web worker}

Option 2

//from a web workerif(isIE) {   //give the exact url so the xhr doesn't get a 302   callXHR('https://s3.amazon.com/...');} else {   //this will follow the redirect to https://aws...   callXHR('https://example.com/document/1234/download');}

I decided on Option 2 because I didn't want to give up the web worker.

The answers provided here were focused on CORS or redirects, but none actually addressed the specific problem I was having.

Try setting up few more metatags in header request, like xhr.setRequestHeader('Access-Control-Allow-Origin', example.com ); // from which request is made

// Create the XHR object.function createCORSRequest(method, url) {  var xhr = new XMLHttpRequest();  if ("withCredentials" in xhr) {    // XHR for Chrome/Firefox/Opera/Safari.    xhr.open(method, url, true);  } else if (typeof XDomainRequest != "undefined") {    // XDomainRequest for IE.    xhr = new XDomainRequest();    xhr.open(method, url);  } else {    // CORS not supported.    xhr = null;  }  return xhr;}// Helper method to parse the title tag from the response.function getTitle(text) {  return text.match('<title>(.*)?</title>')[1];}// Make the actual CORS request.function makeCorsRequest() {  // This is a sample server that supports CORS.  var url = 'https://example.com/document/1234/download';  var xhr = createCORSRequest('GET', url);  if (!xhr) {    alert('CORS not supported');    return;  }  // Response handlers.  xhr.onload = function() {    var text = xhr.responseText;    var title = getTitle(text);    alert('Response from CORS request to ' + url + ': ' + title);  };  xhr.onerror = function() {    alert('Woops, there was an error making the request.');  };  xhr.send();}

For more details check this link - https://www.html5rocks.com/en/tutorials/cors/