We keep our JSPs from caching by including the following line at the top of
each one.
<% response.setHeader("Expires", "Tues, 01 Jan 1980 00:00:00 GMT"); %>
This means that every time somebody enters the URL it will call the server
instead of reading the file out of the browser cache. It does not prevent
the user from hitting the back button and seeing the same page without
hitting the server again. I am not sure that you can force the browser to
hit the server again when the user hits the back button.
-----Original Message-----
From: RESTREPO, ALEXANDER G [Non-Pharmacia/1000]
[mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 04, 2001 3:07 PM
To: JRun-Talk
Subject: How do you prevent JSP's from Caching
Hi:
I want to expire a JSP in order
to prevent a user from hitting the
back button and viewing the information
on the previous page.
Here is an example of a JSP I wrote to
test this and so far I have not been able
to prevent caching.
Could anyone provide me with some recommendations?
Many Thaks:
Alex Restrepo
Monsanto
-------cut here--------------------
<%@ page import="java.util.*" %>
<%
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", -1);
%>
<HTML>
<HEAD>
</HEAD>
<BODY>
<%
out.println("Request Headers");
out.println("");
Enumeration enum = request.getHeaderNames();
while(enum.hasMoreElements())
{
String name = (String)enum.nextElement();
String value = request.getHeader(name);
if ( value != null)
{
out.println(name + ": " + value + "<P>");
}
}
%>
This is a test
<P>
<P>
<A HREF="http://www.ibm.com";><FONT COLOR=red >IBM</FONT></A>
<P>
<P>
<%=System.currentTimeMillis()%>
<p>
This session will expire in <% out.println(
session.getMaxInactiveInterval() ); %> seconds.
<p>
</BODY>
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