The HTML status code is 200, even though the JQuery ajax request shows a status code of 0

My issue is not related to cross site request problem, which is a common suggestion in search results for similar questions.

When attempting to make an ajax request using jquery functions .get and .load, I'm receiving xhr.status 0 and xhr.statusText "error". However, in Firebug, the requested page shows as loaded with html status code 200, the response text is readable, and the response header appears correct.

Here is my code snippet:


function GetProjectTask(e) {
    var loader = $('#' + e + 'tasks div.loader');
    var content = $('#' + e + 'tasks div.content');
    var img = $('#' + e + 'tasks img.collapseimg');
    if (loader.html() == null || loader.html().trim() == '') {
        if (content.html() == null || content.html() == '') {
            img.attr('src', 'images/expanded.gif');
            loader.html('<img src="images/loading.gif" alt="Wait..."> Loading support tasks');
            content.load('includes/my' + e + 'tasks.php',
                function (response, status, xhr) {
                    if (status == "error") {
                        var msg = "Sorry but there was an error: ";
                        alert(msg + xhr.status + " - " + xhr.statusText);
                    }
                }
            );
            return;
        }
    }
    content.empty();
    loader.empty();
    img.attr('src', 'images/collapsed.gif');
}

Server: IIS v.7.5 Jquery: v1.6.2

Any suggestions on how to resolve this issue?

Answer №1

There are various interpretations for a status code of zero, with one common explanation being related to interruptions in the request-response cycle. This could occur if a user leaves a page before the cycle is complete or if there is a failure in communication with the server. Described as a breakdown in outbound communication, this error can arise in scenarios such as cross-site requests or issues on the client side.

According to the W3's XMLHttpRequest specification section 4.8.1, the status attribute is defined based on certain conditions including the state of the request and any error flags that may be raised. Specifically, the UNSENT and OPENED states are highlighted as precursors to sending the request, while the error flag signifies network errors or request cancellations.

A notable dilemma associated with this status code arises when users deliberately cancel requests by navigating away from a page, a scenario not necessarily classified as an error. Distinguishing between genuine network errors and user-initiated aborts remains a challenge, especially when it comes to implementing appropriate actions based on the response received.

In light of feedback received earlier, a potential workaround was suggested involving segregating error handling into distinct callbacks and introducing delays to differentiate between legitimate errors and user-triggered aborts. While this approach may not be foolproof, it offers a possible solution for mitigating errors stemming from prematurely terminated requests.

Answer №2

Encountering a response status code of 0 can be attributed to making xhr requests from a page hosted on my local server to the same server on localhost, as was the case during my website development.

Another potential cause (along with suggested solutions) can be explored in this resource:

"Ensure that you are utilizing relative URLs for your AJAX requests." - invalid HTTP response code ‘0’

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