@RequestMapping(value = "/logout")
    public String logout(HttpServletRequest request,HttpServletResponse response){
        String sessionId = SessionService.getCookieValue(request, "SESSIONID");
        if (sessionService.isAuth(sessionId)){
            sessionService.unsetAuth(sessionId);
            response.addCookie(new Cookie("SESSIONID","0"));
        }
        return "redirect:/";
    }