How to identify incoming URL in a web app?

I have a web app A with a link to another web application B.
When I click on the link B (actually a servlet), it takes me to the new application. Is there a way I can tell where I came from?
i.e. Is there a way to get the URL of the originating application A?
On appl B, I have a <return to A> link. Clicking on this should take me back to A.
How do I do something like this?
Thanks.
Mark Sabatini

I think there's a dereferrer field in the HTTP header that you can query from the HttpRequest.

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