Logout from web app using tomcat Basic authentication

Question

I am using tomcat basic authentication for my web app:

I added following lines to web.xml in my web app:

Answer 1

public void logout() throws IOException {
    HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
    try {
        request.logout();
    } catch (ServletException ex) {
        throw new IOException(ex);
    }
}