Preventing caching of pages

Question

Hi,
I'm having a problem preventing my jsp pages from caching.
On my jsp page I have an ordimage object in a table, the source of which is the url of a servlet which serves up an image. If I navigate to a new page and on this page change the image of a record in the table, then return the initial page the image has not been updated until I press f5 to refresh the page.
I've added the following meta tag to the page header:
<meta http-equiv="PRAGMA" content="NO-CACHE"/>
... but still get the same problem.
Any thoughts would be greatly appreciated.
Thanks,
Dave

Answer 1

Hi, thanks for getting back to me.
I've tried setting the header tags as follows ...
<afh:head title="View Product Images">
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1252"/>
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Cache-Control" content="no-cache" />
<meta http-equiv="Cache-Control" content="must-revalidate" />
<meta http-equiv="Cache-Control" content="must-revalidate" />
<meta http-equiv="Expires" content="Mon, 8 Aug 2006 10:00:00 GMT" />
</afh:head>
... but this still doesn't seem to be preventing caching.
Is the above okay or do I need to set them by doing response.addHeader (or response.setHeader).
I seemed to be unable to add code of the form:
<%
response.setHeader(“Pragma”, “no-cache”);
response.setHeader(“Cache-Control”, “no-cache”);
%>
it gave a compilation error, I assume this is because I am using a jsp document rather than a jsp page? I am very new to jsp's and up until now have avoided writing any additional jsp code, relying entirely on that generated by dragging jsf components onto the jspx document so any help would be greatly appreciated.
Thanks,
Dave