Unexpected Caching of AJAX results in IE8

Question

I\'m having a serious issue with Internet Explorer caching results from a JQuery Ajax request.

I have header on my web page that gets updated every time a user navig

Answer 1

The answers here are very helpful for those who use jQuery or for some reason directly use the xmlHttpRequest object...

If you're using the auto-generated Microsoft service proxy its not as simple to solve.

The trick is to use Sys.Net.WebRequestManager.add_invokingRequest method in the event handler change the request url:

networkRequestEventArgs._webRequest._url = networkRequestEventArgs._webRequest._url + '&nocache=' + new Date().getMilliseconds(); 

I've blogged about this: http://yoavniran.wordpress.com/2010/04/27/ie-caching-ajax-results-how-to-fix/