if (user.getFessUser() instanceof SamlUser) {
            return LaRequestUtil.getOptionalRequest().map(request -> {
                if (logger.isDebugEnabled()) {
                    logger.debug("Logging out with SAML Authenticator");
                }
                final HttpServletResponse response = LaResponseUtil.getResponse();
                final SamlUser samlUser = (SamlUser) user.getFessUser();
                try {