cors_request.js

function createCORSRequest(method, url) {
        var xhr = new XMLHttpRequest();
        if ("withCredentials" in xhr) {
            // XHR for Chrome/Firefox/Opera/Safari.
            xhr.open(method, url, true);
        } else if (typeof XDomainRequest != "undefined") {
            // XDomainRequest for IE.
            xhr = new XDomainRequest();
            xhr.open(method, url);
        } else {
            // CORS not supported.
            xhr = null;
        }
        return xhr;
    }

    // Helper method to parse the title tag from the response.
    function getTitle(text) {
        return text.match('<title>(.*)?</title>')[1];
    }

    // Make the actual CORS request.
    function makeCorsRequest() {
        // This is a sample server that supports CORS.
//        var url = 'http://icanhazip.com';
        var url = 'http://smart-ip.net/myip';

        var xhr = createCORSRequest('GET', url);
        if (!xhr) {
            alert('CORS not supported');
            return;
        }

        // Response handlers.
        xhr.onload = function () {
            var text = xhr.responseText;
            console.log(text);
        };

        xhr.onerror = function () {
            alert('Woops, there was an error making the request.');
        };

        xhr.send();
    }
    makeCorsRequest();