Thank you Amos, setting the TTL worked.
I had no idea that the helpers had a separate cache, and that was creating a
lot of frustration for me.
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I have an external_acl_type directive which returns "OK" or "ERR" depending
on a database query.
The problem is this: when the database is updated, which should permit the
site to be accessed, Squid has the previous response cached, the result
being continued "access denied" responses until either
