Cache file(pdf) in user's browser using Servlet -Cookie, or Session

How can I save a file (pdf) in the cache of a browser (IE 6) in a user's computer? I am using Servlet and Tomcat 4.1.24. PDF file is sitting in server (remote computer) under a URL space.
The idea is to NOT to download the pdf file on user's computer (from the remote server) if the user has a cached copy of the pdf file and pdf file in the server is the same as the pdf file in the browser. If cached pdf is different from pdf in browser, or, if the user does not have that pdf file in cache, then download pdf file from the server.
Can I come up with a way to use Cookie class? Cookie class does not have an API which will let me save a file in it. I could have saved the pdf file in the Cookie with 999999999 setMaxAge. Is storing that pdf file in session the only choice? I do not see session serving my purpose - session should not be valid for a longgg duration e.g. week or month.
Also, how would I create a file whne I am given a URL to that file.
URL fileInServer = new URL("http://www.myDomain.com/myWebApp/PDF/my.pdf);
URLConnection conn = fileInServer.openConnection();
Does getContent() help and what are the steps after that?
Any help with the source code will be appreciated.
Thanks,
Sam
[email protected]

I am NOT creating this PDF file on the fly. This pdf file is sitting in the server (remote machine) under URL e.g. http://10.10.10.xxx:8081/myApp/PDF/my.pdf
I need to check if this pdf file is in the cache in user's computer (differnt machine than the server) and if the cached pdf is the same as the pdf in the server. If that file is not in the cache, or if they are not the same, then, I need to save the pdf file from the server into user's browser cache.
I am writing all that code in Servlet. I can save the file in session. I do NOT know how else can I cache the file, other than saving it in session. I can not think of any setHeader() which will let me save a file in user's browser cache. Headers like If-Modified-Since are of no help, as it does not let me compare file in browser cache with the file in server.
Also, how would I create a file, given a URL to that file.
URL fileInServer = new URL("http://www.myDomain.com/myWebApp/PDF/my.pdf");
URLConnection conn = fileInServer.openConnection();
Do I use getContent()? What are the steps after that?
Thanks,
Sam
[email protected]

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