Is there a known bug in XMLHttpRequest?

Add-ons Development
#1

I have written a chrome extension that that uses XHR:

  var request = new XMLHttpRequest;

 request.open("GET", "https://www.xxxxxx.com/xxxx.php?filter=app_xxxxxx", true);
 request.addEventListener('load', function (event) {
     if (request.status == 200) {

        console.log("len="+request.response.length);
     }

 });

 request.send(null);

When I run this in Chrome len is 1546530
Now I installed that addon in Firefox with the very same call. When I run it in the FF developer version then len is 1546530

But when I run it in the normal FF version then len is 49403

How can this be?

#2

Have you tried using the fetch API? It’s the new and fancy way of sending requests and it works in both Firefox and Chrome. It returns a promise :slight_smile:

#3

I found the reason for my problem, the called website has forwared my request in the normal FF because it identified me as another user than I was logged in there. The developer FF did identify me as the right user