Code to prevent page caching using ajax

< ;metahttp-equiv="expires"content="wed,26feb199708:21:57gmt">
or

asp web page

<%
response.expires=-1
response.expiresabsolute=now()-1
response.cachecontrol="no-cache"
%>

php web page

header("expires:mon,26jul199705:00:00gmt");
header("cache-control:no-cache,must-revalidate");
header("pragma: no-cache");
?>

jsp web page

response.addHeader("pragma", "no-cache");
response.addHeader("cache-control", "no-cache,must-revalidate");
response.addHeader("expires ", "0");