This would have to be done at the JSF ResponseWriter level. You'll need to ask about that on a JSF forum View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4102724#4102724 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4102724