Problem using HTTP filter with ajax button

[zizou84]

Hi
I am using primefaces 3.
i use a javax.servlet.Filter to handle authentification.
the problem is that when i cliqued a non ajax button in a non active session,the redirection(with response.sendRedirect) to the login page is done, but when i clique an ajax button,the redirection to the login page doesn't work.
How to solve this problem?