Authentication issue when downloading jar files

Hi,
I am having a problem starting up my application when the application server, in this case WebSphere 5.0, requires the user to be authorized.
In our development environment the server uses basic authentication but once deployed in our test environment we are required to use form based authentication, which I've read that JWS cannot handle.
The current flow is as follows:-
1. The user navigates to a protected page and is prompted to enter a user name and password.
2. Once authenticated they are shown the page that contains a link to a JNLP file.
3. The user clicks on the link, JWS processes the JNLP file and requests the first jar file.
4. The application server sees that there is no 'authorization' header set on the request so asks for the credentials again.
5. For basic authentication the user is prompted by JWS to enter the user name and password and the download succeeds.
6. For form based authentication, JWS instead receives an HTML login page and, after a short period, reports that it received a corrupted jar file.
I was wondering if there is any way to pass key/value pairs within the JNLP file (or any other approach to pass this data) that JWS could then use to populate the 'authorization' header of the request to load the jar files?
If this is not possible, are there any other techniques I could use to get round this?
I am currently passing other data via the 'JSP as JNLP' approach with my own servlet so can make dynamic changes to the JNLP file as needed.
Thanks in advance.

Hi ipooley,
I came upon your posting here after I've been searching for long for some "standard-conform" decision to this IMHO very popular problem and I was not able to find something so far apart of adding some jsessionid to the jar files in the href tag in order to hack the app server to believe the client is authenticated. In my case this doesn't help as well because the authentication is done separately through the company portal. Could you please give me some more details about your "hack"? I've tried to call the jnlp file from an applet (simply with showDocument(jsp generating jnlp) but this doesn't (and actually it can't) work too. And what about the jnlp file itself - if I set the href in the jnlp I have the same problems with the jnlp too?
thanks in advance for your reply,
Ilko

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