cache problem with MS Proxy 2.0

hello there,
our client has been having problem with their proxy server MS Proxy 2.0.
apparently, the proxy cache seems to be enabled..it would not display correct web pages and will only display previously viewed web page.
i have tried adding this meta tags:

Code:

<META HTTP-EQUIV="pragma" CONTENT="nocache"> <META HTTP-EQUIV="Expires" CONTENT="">

but it didn't work..at least for this case.. ive read in some articles that these ("Pragma: no-cache") header is NOT honored by many proxies..ive seen another solution to disable proxy cache by setting up httpd file the webserver, Apache to be exact. but we're working with tomcat alone(without apache)... HELP?IDEAS anyone?? :eek: