Duplicate all Google Analytics hits

hook.html

<script>
    (function (window, variable, task) {
        window['GoogleAnalyticsObject'] = variable;
        window[variable] = window[variable] || function () {
                (window[variable].q = window[variable].q || []).push(arguments);
                if (arguments[0] === "create") {
                    window[variable]((arguments[2] && arguments[2].name || "t0") + ".require", "duplicator");
                }
            };

        window[variable].l = 1 * new Date();

        window[variable]("provide", "duplicator", function (tracker, options) {
            var xhr = new XMLHttpRequest(),
                handler = tracker.get(task);

            tracker.set(task, function (model) {
                handler(model);
                xhr.open("GET", "/collect?" + model.get("hitPayload"), true);
                xhr.send();
            })
        });
    })(window, 'ga', 'buildHitTask');
</script>