[squid-users] acl rep_header SomeRule X-HEADER-ADDED-BY-ICAP

I seem to be having trouble with acl rep_header trying to match against
an X-Header added by ICAP from the squid server in question.

acl TextAdultContent rep_header X-TEXT-CATEGORY adult.*
acl TextConfidenceSolid rep_header X-TEXT-CATEGORY-CONFIDENCE SOLID
acl TextConfidenceAmbiguous rep_header X-TEXT-CATEGORY-CONFIDENCE AMBIGUOUS

http_access deny TextAdultContent TextConfidenceSolid

I do not get any errors on loading, but it doesn't deny the connection.
I do see the X-Headers in question in Firefox + FireBug so I know the
correct ones are set.

Is this possible with ICAP + Squid, or is it a bug, or just not possible?

Thank you,
Trever Adams

-- 
"Better to remain silent and be thought a fool than to speak out and
remove all doubt."
		-- A. Lincoln