Portal Web API Wrapper AJAX

<script>
(function(webapi, $){
    function safeAjax(ajaxOptions) {
        var deferredAjax = $.Deferred();
        shell.getTokenDeferred().done(function (token) {
            // add headers for AJAX
            if (!ajaxOptions.headers) {
                $.extend(ajaxOptions, {
                    headers: {
                        "__RequestVerificationToken": token
                    }
                });
            } else {
                ajaxOptions.headers["__RequestVerificationToken"] = token;
            }
            $.ajax(ajaxOptions)
                .done(function(data, textStatus, jqXHR) {
                    validateLoginSession(data, textStatus, jqXHR, deferredAjax.resolve);
                }).fail(deferredAjax.reject); //AJAX
        }).fail(function () {
            deferredAjax.rejectWith(this, arguments); // on token failure pass the token AJAX and args
        });
        return deferredAjax.promise();
    }
    webapi.safeAjax = safeAjax;
})(window.webapi = window.webapi || {}, jQuery)
</script>