A list of ACL elements which, if matched and denied, cause the request to
	not be satisfied from the cache and the reply to not be cached.
	In other words, use this to force certain objects to never be cached.

	You must use the words 'allow' or 'deny' to indicate whether items
	matching the ACL should be allowed or denied into the cache.

	This clause supports both fast and slow acl types.
	See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.