Limit output filter by response code

I'm using external filters to minify javascript and CSS files as they
head out of the server. The minifier takes a good 500ms to run,
causing serious drag. So I put Squid in front of the server and
configured it as a caching proxy. The problem is, the filters are
running even on "304 Not Modified" responses, meaning there isn't
actually any content to minify.

So I want to be able to configure whether or not the filter is used
based on the response code. Is this possible? Alternatively, if I can
access the response code in the ext filter (as an env var or command
line parameter, for instance), then I can make the decision there.

Any help would be really great.
Thanks,
-Brian

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