attempt to log window.onerror on the server with XMLHttpRequest

gistfile1.js

window.onerror = function(message, url, linenumber) {
    if (window.XMLHttpRequest) {

        var xhr = new XMLHttpRequest();
        var scripturl = "http://127.0.0.1:8069/log";
        var log = linenumber + message + url;
        xhr.open("POST", scripturl);
        xhr.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
        xhr.send(log);
    }
    return false;
}