Yes you are rite, I think the issue is the requirement is to provide
a plug-in  which do the task i have described which act  as a black box
which the existing server  only need to know the the API to fire up
the task instead of do customizing on the existing  server.

The plug-in might need to turn the origin http request into a
predefined format (example an xml) before post to another server.

The key point is : provide a utility to encapsulate as much as work
need to be done in this component and let the server just install it
with minimal configuration.

The server might not j2ee compliant

I hope I'm not too idealistic as the stringent requirement have been
imposed to the design  team.

Please feel free to ask me more if i do ont make it clear enough

One more qs : Am I right there is no way to relax the restriction
that applet  cant make any connection  to the host  beside its origin