JavaScript CORS helper method. Read more about CORS here: http://www.html5rocks.com/en/tutorials/cors/http://www.nczonline.net/blog/2010/05/25/cross-domain-ajax-with-cross-origin-resource-sharing/

cors.helper.js

function createCORSRequest (poMethod, pcURL) {
    var oXHR = new XMLHttpRequest();
    
    if ('withCredentials' in oXHR) {
        // Check if the XMLHttpRequest object has a "withCredentials" property.
        // "withCredentials" only exists on XMLHTTPRequest2 objects.
        oXHR.open(poMethod, pcURL, true);
    } else if (typeof XDomainRequest != 'undefined') {
        // Otherwise, check if XDomainRequest.
        // XDomainRequest only exists in IE, and is IE's way of making CORS requests.
        oXHR = new XDomainRequest();
        oXHR.open(poMethod, pcURL);
    } else {
        // Otherwise, CORS is not supported by the browser.
        oXHR = null;
    }
    
    return oXHR;
}

function makeCorsRequest (pcURL) {
    var oXHR = createCORSRequest('GET', pcURL);
    
    if (!oXHR) {
        throw new Error('CORS not supported');
    } else {
        /* For windows authentication, must be withCredentials = true*/
        oXHR.withCredentials = true;
        
        oXHR.onload = function() {
            var cResponseText = oXHR.responseText;
            
            console.log(cResponseText);
            // process the response.
        };
        
        oXHR.onerror = function() {
            console.error('There was an error! ' + oXHR.statusText);
        };
        
        oXHR.send();
    }
}

makeCorsRequest ('http://localhost:9000/api/Values');