GWT-RPC authentication

Hi. I'm working on a GWT project in which I plan to use a GWT-RPC
proxy on tomcat which will interact with the target host, also on
tomcat.

My main concern at this point is user authentication. I'm not sure I
understand how this should work. In previous projects using Flex, we
had a simple form-based auth setup in which we established the
session and all was good. I assume that tomcat created a session
cookie behind the scenes and used this for all further requests.

My question is:
How will either form-based or basic authentication work with a GWT-RPC
proxy between the client and host server?

What do I need to configure for this to work? Both proxy and target
hosts are running tomcat.

thanks in advance for any help.

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