Getting ResponseText without calling servlet using xmlhttprequest in IE(Any version)

Hi, I'm using xmlhttprequest to call servlet. It is working fine in Firefox. But, in IE, only if I click refresh button, it is working(that too sometimes). Otherwise, it is not triggering. Moreover, the response text is displayed without calling the servlet. Is that using Cache or what? I don't have any idea . Help me out please.

From stackoverflow

• MSIE is too eager in caching XHR requests. The only feasible way to get around this is to add a querystring with a timestamp to the XHR URL.

  var url = '/url/to/your/servlet?' + new Date().getTime();