Disable the browser cache: Cache-Control, pragma, expires
response.setHeader("Cache-Control", "no-cache"); response.setHeader("pragma", "no-cache"); response.setDateHeader("expires", -1); response.getWriter().print("hello hello!");
<meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0">