throwawayloco

  function ajaxRequest(method, url, payload) {
    return new Promise(function(resolve, reject) {
        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function () {
            if (this.readyState == XMLHttpRequest.DONE) {
                if (this.status >= 200 && this.status < 500) {
                    resolve(this);
                }
                reject(this);
            }
        }
        xhr.open(method, url, true);
        if (payload) {
            xhr.send(payload);
        } else {
            xhr.send();
        }
    });
}