A sample service wrapper that I'm using for wrapping all of my GET based Azure services.

ServiceWrapper.js

"use strict";

if (typeof(Services) === "undefined")
{
    Object.defineProperties(this, {
        Services: {
            value: {},
            configurable: false,
            writable: false
        }
    });
}

Object.defineProperties(this.Services, {
    UserFeedback: {
        value: (function () {
            var _userFeedbackServiceUrl = "http://127.0.0.1/UserFeedback.svc";
            var _userFeedbackService = {};

            function _packParameters(parameterPack) {
                var params = [];
                for (var i in parameterPack) {
                    params.push(i + "=" + encodeURIComponent(parameterPack[i]));
                }
                return params.join("&");
            }

            function _keepAlive() {
            }

            function _submitFeedback(serviceMethod, parameterPack) {
                var xhr = XMLHttpRequest();
                xhr.onreadystatechange = _keepAlive;
                xhr.open("GET", _userFeedbackServiceUrl + "/" + serviceMethod + "?" + _packParameters(parameterPack), true);
                xhr.send();
            }

            Object.defineProperties(_userFeedbackService, {
                submitUserRating: {
                    value: function submitUserRating(user, email, rating, message) {
                        _submitFeedback("SubmitUserRating", { "user": user, "contact": email, "rating": rating, "msg": message });
                    }
                },
                submitFeatureRequest: {
                    value: function submitFeatureRequest(user, email, message) {
                        _submitFeedback("SubmitFeatureRequest", { "user": user, "contact": email, "msg": message });
                    }
                },
                submitBugReport: {
                    value: function submitBugReport(user, email, bugDesc, reproSteps, gameData) {
                        _submitFeedback("SubmitBugFeedback", { "user": user, "contact": email, "bugDesc": bugDesc, "repro": reproSteps, "dump": gameData });
                    }
                },
            });
            return _userFeedbackService;
        })(),
        configurable: false,
        writable: false
    }
});