Preventing User to go back after logout in jsp

 <%

  response.setHeader("Cache-Control","no-cache");

  response.setHeader("Cache-Control","no-store");

  response.setHeader("Pragma","no-cache");

  response.setDateHeader ("Expires", 0);

  if(session.getAttribute("user")==null)

      response.sendRedirect("index.jsp");

  %>