Cache problem when coming back from external application

Question

Let's see if I can explain this properly. We have an application consisting of a left menu with books and pages. Each page consists of one Struts portlet. In one case we direct the user to an external mail application. This is handled by the Struts action class setting some fields (identifier and a url to return to when closing the external application). Our action class forwards to a jsp page like this (where url, SESSION_KEY and LINKBACK_URL are populated by the action class)
<form action="${url}" name="myForm" METHOD="POST" TARGET="_top">     
<INPUT TYPE="hidden" NAME="i_session" VALUE="<c:out value='${SESSION_KEY}'/>">
<INPUT TYPE="hidden" NAME="linkback" VALUE="<c:out value='${LINKBACK_URL}'/>">
</form>
<script language="javascript">
     document.myForm.submit();
</script>
The external application opens up in the same window and when the user closes it you're linked back to our application through the LINKBACK_URL. Now, when I click in the left menu as I did from the start all I see is a blank page (if I click once again it displays correctly) and if I press F5 I'm logged into the external application again so it seems the jsp page with the form is cached. I can in a way understand that it does but I don't want that so are there any way to get rid of this behaviour?
Best Regards
Torbjorn

Answer 1

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Edited by Holy at 03/24/2008 11:32 PM