Tested with jquery master from github and Firefox 30 and Chrome 35 beta.

The preflight OPTIONS request is not sent when credentials are specified as arguments to XMLHttpRequest.open().

Manually adding the "Authorization" header works in both browsers; i.e.: the OPTIONS request is sent before the actual response.

The point of the examples below is to demonstrate that the required OPTIONS requests is sent by the browsers in case 1) but not in case 2). Both requests fail to actually load the content because the *server's response* to the OPTIONS request is wrong.

1) OPTIONS request is correctly sent

    var url = "https://test-cors.appspot.com/";
    var username = "foo";
    var password = "bar";

    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.withCredentials = true;
    xhr.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password));
    xhr.send(); 

2) OPTIONS request is *not* sent

   var url = "https://test-cors.appspot.com/";
    var username = "foo";
    var password = "bar";

    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true, username, password);
    xhr.withCredentials = true;
    xhr.send(); 

stack trace:

s jquery-1.7.2.min.js:3 c.querySelectorAll.m jquery-1.7.2.min.js:3 f.fn.extend.find jquery-1.7.2.min.js:3 e.fn.e.init jquery-1.7.2.min.js:2 a.fn.init jquery-migrate-1.2.1.js:7 e jquery-1.7.2.min.js:2 initDataTable rept.js:251 exec_rept rept.js:199 $.ajax.success homePage.html:1193 o jquery-1.7.2.min.js:2 p.fireWith jquery-1.7.2.min.js:2 w jquery-1.7.2.min.js:4 send.d

I am trying to draw jquery datatable, but it is failing by above error because of that my other events like hoverIntent, other js functionality is failing, can you help me out to fix the problem?

Autocomplete Functionality is not working in IE9. Same thing is working in IE10 and IE11. This is the line which i am using as of now to work in IE10 and IE11. if(jQuery.browser.msie && jQuery.browser.version.substring(0, 1) >= 8) return this;

Please let me know the reason, why its not working in IE9.