Avoid an OPTIONS request when using DataSource.IO with CORS headers

io-cors.js

YUI().use("datasource-io", function (Y) {

  // Described in YUI 3.3.0's patch notes
  // http://yuilibrary.com/projects/yui3/wiki/ReadMe/RollUp_3.3.0?version=3
  //  
  var ds = new Y.DataSource.IO({
    source: "http://www.example.com/",
    ioConfig: {
      headers: {
        "X-Requested-With": "disable"
      }
    }
  });

});