Get rid of a 401 (unauthorized) ajax error in browser console

Question

I\'m calling an api through javascript using a jQuery.ajax call. The api respond with 401 if the user is not authenticated and I want to ignore this error only for this call.

Answer 1

I also ran into this issue and wanted to surpress the exception in the JavaScript console for HTTP 401 and 404 etc errors. I found this question and didn't see why the error() and statusCode() handlers didn't quiet the exception so i did my own digging into it.

As far as i can tell it turns out that this is an issue with the native ajax XMLHttpRequest Object in the browser, not with jQuery. To prove this i used the following test code:

function xhrTest(index) {
    var ajaxObjects = [
        $.ajaxSettings.xhr(), // what jquery returns
        new XMLHttpRequest()  // the native one in the browser
    ];
    var ajax = ajaxObjects[index];
    ajax.onreadystatechange = function() {console.log("xhrTest: state: " + ajax.readyState)};
    var errorHandler = function() {console.log("xhrTest: error");};
    ajax.onerror = errorHandler;
    ajax.onabort = errorHandler;
    ajax.open("GET", "/fileThatDoesNotExist", true);
    ajax.send();    
}

Note that when calling this (i did it from the JavaScript console) with either xhrTest(0) or xhrTest(1), which bypasses jQuery, that the results are the same: