Denying caching by response headers?possible?

[Eliezer Croitoru <eliezer@xxxxxxxxxxxx>]

i took this from the acls docs:
	acl aclname rep_mime_type [-i] mime-type ...
	  # regex match against the mime type of the reply received by
	  # squid. Can be used to detect file download or some
	  # types HTTP tunneling requests. [fast]
	  # NOTE: This has no effect in http_access rules. It only has
	  # effect in rules that affect the reply data stream such as
	  # http_reply_access.


and I was wondering if this is suppose to work:

acl response_mime rep_mime_type "some mime type"

cache deny dstdom_acl response_mime
cache allow all

I remeber that using a status code like 30x for the same task wouldn't work.

Thanks,
Eliezer