The status code of an XMLHttpRequest is consistently set to 0

When it comes to handling all ajax requests and specifically dealing with 409 errors, I am facing an issue where my status code always shows as 0, despite FireFox's debugger clearly indicating a 409 error. Below is the snippet of JS code I have been using:

(function(open) {
  XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {
    if(this.status === 409)
        console.log("Conflict 409")
    open.apply(this, arguments);
  };
})(XMLHttpRequest.prototype.open);

Even though I can easily create 409 errors in my server code and see them being displayed in both FireFox and Chrome, the this.status property remains at 0 - even for 400 errors. Can someone please guide me on what might be going wrong here?

javascriptajax

Answer №1

Make sure to wait for the request to complete before checking its status.

If you want to intercept XHR responses, consider using the xhook library.

Here is an example of how you can use it:

xhook.after((request, response) => {
  if (response.status === 409) {
    console.log("Conflict 409")
  }
})

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