HTTP Transform request in Angular 2

I am attempting to add a single parameter to all my web requests so that caching is forcibly disabled. All I want to do is add

?v=1535DC9D930 // Current timestamp in hex

to the end of every request.

I am writing this in plain ES5 JS, but all the documentation is in Typescript which is taking a little while to convert. I have the following so far:

(function(app) {
    app.CustomHttp = ng.core
        .Class({
            constructor: [ng.http.Http, function(http) {
                console.log(this);
                this.http = http;
            }],
            request: function() {
                return this.http.request.apply(arguments);
            },
            get: function() {
                return this.http.get.apply(arguments);
            },
            post: function() {
                return this.http.post.apply(arguments);
            },
            put: function() {
                return this.http.put.apply(arguments);
            },
            delete: function() {
                return this.http.delete.apply(arguments);
            },
            patch: function() {
                return this.http.patch.apply(arguments);
            },
            head: function() {
                return this.http.head.apply(arguments);
            }
        });
})(window.app || (window.app = {}));

(function(app) {
    document.addEventListener('DOMContentLoaded', function() {
        ng.core.enableProdMode();
        ng.platform.browser.bootstrap(
            app.AppComponent,
            [ng.core.provide(ng.http.Http, { useClass: app.CustomHttp })]
        ).catch(function(error) {
            console.error(error);
        });
    });
})(window.app || (window.app = {}));

The app fully works, yet the console.log(this) in the CustomHttp never gets called, and when I inspect ng.http.HTTP_PROVIDERS in the browser it doesn't appear to be using CustomHttp. I have also tried:

[ng.http.HTTP_PROVIDERS, ng.core.provide(ng.http.Http, { useClass: app.CustomHttp })]

In my boot.js to no avail.

I'm sure there is something tiny that I am missing, or that I have massively over complicated this (How hard can it be to add a single parameter to all get requests?).