rewrite on ssl request

I've tried to rewrite on an SSL request (testing for the env HTTPS==on), and
I've had no success. rewrite.log seems to indicate that it doesn't know what
the https environment is (even though this is an https request).
Is there any way to do a rewrite based on whether or not the request was an
https requets? Any pointers would be greatly appreciated.
Aryeh
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Aryeh Katz
VASCO
www.vasco.com

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