iPlanet 7.0 "The internet explorer was not able to open this internet site"

[Praveen Sangolli]

Hi
I have a custom proxy on an iPlanet webserver and when i am trying to open a PDF or a RFT file from IE browser it says "the internet explorer was not able to open this internet site". I google searched and found that we need to set the response header as public so that we allow the browser to cache the file. Can anyone help me on how to configure that header to set the cache content in Oracle iPlanet 7.xx webserver

Any help is appreciated

Thanks & Regards
Praveen N Sangolli