Hi Folks,
I'm working to try to get an app that runs on a rather old version of jBoss to
disallow caching on Opera browsers in some critical places. The jBoss version
in question is 3.something, I think--2002 vintage or so.
Background. The application is a library automation system at a university.
Without going into a lot of detail, when a user is connected via an Opera
browser, what's happening is that a particular form gets cached and so if the
user tries to ask the library for 3 books, instead of sending, 3 independent,
distinct sets of info (one for each book title), the same book info gets sent
to the server every time and the web app just throws the 2nd and 3rd away as
spurious dupes--the users get mad when only the first submission actually takes.
Unfortunately, it appears that to solve this problem for Opera users, I need to
send something in the HTTP header itself. The following are in the critical web
pages served up by jBoss already (it builds the pages from XSL templates so we
just added these to the templates in question; it didn't solve the problem on
Opera):
<META http-equiv="Pragma" content="no-cache">
<META http-equiv="Cache-Control" content="no-cache">
They already had this one (and we left it in):
<META http-equiv="expires" content="0">
Adding the no-cache pragma and cache-control META tags solved the problem for
Firefox browsers. And, on test Opera setups, if we configure it so it does not
do caching no matter what, everything works great. So it's pretty clear the
problem is the unwanted caching. It's not practical to tell Opera users to just
disable all caching when they interact with this one site....
As described here:
http://developer.apple.com/internet/safari/faq.html#anchor5
the no-cache directives need to be in the HTTP header of the response, rather
than in META tags--at least for Opera (the caching mostly leads to problems for
Mac users--overwhelmingly the faculty members have Macs...).
So, the question: is there a way to configure jBoss to send these values in the
HTTP headers or do we have to try to find the code that builds the JSPs
(apparently done on the fly--the vendor is being no help at all: grrr!) and
decompile it and add this to the HTTP response construction?
Any suggestions welcomed!
Thanks,
John
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