mod_expires setting unwanted Expires on 5XX status codes

[Gordon Mohr <gojomo@xxxxxxxxxxx>]

Using mod_expires in Apache 2.2.X, I want everything *except* 5XX status 
code responses (like 503, service unavailable/busy) to have an Expires 
header added.

I don't see a switch to limit mod_expires by response code.

It looks like a 'Header unset' conditional on the existence of an 
environment variable previously set based on response code could work; 
is there an environment variable set to the about-to-be-returned status 
code, at the time of late mod_headers action?

Thanks for any ideas,

- Gordon @ IA

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