清瀏覽器緩存

response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control","no-cache");
response.setHeader("Cache-Control","no-store");

<meta http-equiv="Expires" CONTENT="0">
<meta http-equiv="Cache-Control" CONTENT="no-cache">
<meta http-equiv="Pragma" CONTENT="no-cache">