MVC3. Browser alerts by itself when returning 500 status code

Question

Hello how to prevent browser from alerting by itself, when returning a HttpStatusCodeResult object.

The Action Method:

    [HttpPost]
    public ActionResult Finish()
    {
        //Throw the status code result          
        return new HttpStatusCodeResult(500,"Oops something wrong happened!");
    }

The script

           jQuery.ajax({
                url: '@Url.Action("Finish","Home")',
                type: "POST",
                success : function(result) {
                    alert("success is:"+result);
                },
                error: function (response, status, errorThrown) {
                    alert(errorThrown);
                }
            });

The result of calling Finish() Action is displayed in the alert(); function, but under the custom alert, The browser also alerts with a message - "The page cannot be displayed because an internal server error has occurred."

SOLUTION

The actual problem was, as #tanathos pointed out, a global function:

jQuery(document).ajaxError(function (e, jqxhr, settings, exception) {
if (jqxhr != null) {
    alert(jqxhr.responseText);
}

Thank you very much for your help. Question Closed.

Answer 1

Maybe somewhere in your project there's already a lower level catch for ajax errors, like an ajaxSetup or an ajaxError.

Also, is jQuery the only framework implemented?