dojo xhrget

I am trying to use dojo.xhrGet . I tried like this. But it doesn't get content from url. how can i fix it ?

dojo.provide("com.example.common.ExposureProvider");
(function() {
// let's call the ajax url now so we can update the page
var value2;
dojo.xhrGet( { //
// The following URL must match that used to test the server.
url: "http://www.vogella.de/articles/AjaxwithDojo/download/includeTextFile.txt",
handleAs: "text",

timeout: 5000, // Time in milliseconds

// The LOAD function will be called on a successful response.
load: function(response, ioArgs) { //
value2 = response; //
return response; //
},

// The ERROR function will be called in an error case.
error: function(response, ioArgs) { //
console.error("HTTP status code: ", ioArgs.xhr.status); //
value2 = 'error'; //
return response; //
}
});

dojo.declare("com.example.common.ExposureProvider", null, {

getValue: function(attribute, workItem, configuration) {
var value= value2;


return value;
}

});



})();