Intercepting network requests HTTPrequest using the XMLHTTPRequest object

XMLHttpRequest.js

var request;
        if (window.XMLHttpRequest) {
             request = new XMLHttpRequest();
        } else if (window.ActiveXObject) {
             try {
                  request = new ActiveXObject('Msxml2.XMLHTTP');
             } catch (e) {
                    try {
                            request = new ActiveXObject('Microsoft.XMLHTTP');
                    } catch (e) {}
} }
        request.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                doSomething(this.responseText);
            }
};
        // Open, send.
        request.open('GET', '/some/url', true);
        request.send();