Prevent Browser Cache

Posted on August 21, 2013October 26, 2015 By David Kittell

ASPResponse.Expires = 0
Response.Expiresabsolute = Now() - 1
Response.AddHeader "pragma","no-cache"
Response.AddHeader "cache-control","private"
Response.CacheControl = "no-cache"

ColdFusion<cfheader name="expires" value="#now()#">
<cfheader name="pragma" value="no-cache">
<cfheader name="cache-control" value="no-cache, no-store, must-revalidate">

HTML
`<meta` `http-equiv="expires"` `content="Mon, 06 Jan 1990 00:00:01 GMT">`

JavaServer Pages / JSP<%
response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>

PHPHeader('Cache-Control: no-cache');
Header('Pragma: no-cache');

Sources:

ASP – http://support.microsoft.com/kb/311006/en-us
PHP – http://www.php.net/manual/en/function.header.php
ColdFusion – http://www.bpurcell.org/blog/index.cfm?entry=1075&mode=entry
JSP – http://www.jguru.com/faq/view.jsp?EID=377&page=2

Originally Posted on August 21, 2013
Last Updated on October 26, 2015

All information on this site is shared with the intention to help. Before any source code or program is ran on a production (non-development) system it is suggested you test it and fully understand what it is doing not just what it appears it is doing. I accept no responsibility for any damage you may do with this code.

Related

ASP Code ColdFusion JavaServer Pages JSP PHP VB