Question

I am sending an ajax XMLHttpRequest using the POST method. When the request is sent, I am getting a readyState of 4 with a status of 12030. I know 12030 is a Microsoft specific state code that indicate the connection was not sustained. However, I can’t seem to find where my code would be causing this error. If I navigate to the page without using the ajax request, it loads fine. Below is the javascript method and the call line.

AJAX Method

/*Sends ajax request with post data that updates the content view via ajax on completion
* @param message : message after completion of ajax request
* @param url : url to request
* @param params : post parameters as string
*/
function changeAjaxPost(message, url, params) {
    var ajx;
    if (window.HXMLHttpRequest) {
        UtilLogger.log(HtmlLogger.FINE, "Using XMLHttpRequest");
        ajx = new XMLHttpRequest();
    }
    else {
        UtilLogger.log(HtmlLogger.FINE, "Using ActiveXObject");
        ajx = new ActiveXObject("Microsoft.XMLHTTP");
    }
    ajx.open("POST", url, true);
    ajx.setRequestHeader("X-Requested-With", "XMLHttpRequest");
    ajx.setRequestHeader("Content-Type", "text/html");
    ajx.setRequestHeader("Content-length", params.length);
    ajx.setRequestHeader("Connection", "close");
    ajx.send(params);
    ajx.onreadystatechange = function () {
        document.write(ajx.readyState + ":" + ajx.status);
        if (ajx.readyState == 4 && ajx.status == 200) {
            alert(message);
            updateContent();
        }
        else if (ajx.readyState == 4 && ajx.status == 400) {
            alert("Page Error. Please refresh and try again.");
        }
        else if (ajx.readyState == 4 && ajx.status == 500) {
            alert("Server Error. Please refresh and try again.");
        }
    }

}

Call Line

changeAjaxPost("Excerpt Saved", "./AJAX/myadditions_content.aspx", params);

Answer 1

Sometimes, using

setRequestHeader("Connection","close");

can cause problems in some browsers.

Removing this solves the problem.

Credit goes to @MikeRobinson