Customizing the Properties of the XmlHttpRequest Object
The WinJS.xhr() function is nothing more than a wrapper around the native browser XmlHttpRequest object. There are some cases in which you might need to use features of the underlying XmlHttpRequest object that are not exposed through the options of the WinJS.xhr() function. In these cases, you can take advantage of the WinJS.xhr() function’s customRequestInitializer option to customize the XmlHttpRequest object.
Imagine, for example, that you want to request and display the contents of a text file. Furthermore, you want to display download progress during the Ajax request.
The page in Listing 2.17 contains an HTML5 PROGRESS element (for displaying the download progress) and a DIV element ...
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