Using xhr() in Windows Store Apps
At times you
may need to make cross-domain requests in your Windows store app. This
can be done using the WinJS.xhr() function. The xhr() function is an
easy to use wrapper over the traditional XMLHttpRequest object. This
article introduces you with the xhr() function and many of its
configuration options. It also illustrates how the xhr() function can be
used to call ASP.NET Web API.