Prevent caching of json ajax request

An user who is using IE9 might experience a strange behaviour inside a webpage with json ajax requests. This is so because IE9 does caching of these requests.

I added in common/../CommonEvents.java , jsonResponseFromRequestAttributes method the following:
response.setDateHeader("Expires", -1);
response.setHeader("Cache-Control", "private");
response.setHeader("Last-Modified", new Date().toString());
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");