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Date: Sun, 28 Sep 2008 21:33:06 -0700
From: Gordon Mohr <gojomo@archive.org>
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Subject: Re: [users@httpd] mod_expires setting unwanted Expires on 5XX status
 codes

Nick Kew wrote:
> 
> On 28 Sep 2008, at 23:38, Gordon Mohr wrote:
> 
>> 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.
> 
> That doesn't make sense.  For many response codes, it's just Not 
> Applicable.

For our application, the exceptions to long cacheability are rare -- 
only (usually-transient) server errors (5XXs). Even 3XX and 4XX 
responses should be cached a day, or longer.

>> 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?
> 
> You'd have to set the env var after the response was known, too.  That can
> only happen if the response is known early, and that only happens when
> the response is itself generated by server configuration (e.g. a redirect,
> or access denied), or if the response is static and local.
> 
> The general-purpose solution is an ErrorDocument.

How can the ErrorDocument prevent mod_expires from setting the default 
Expires value on its 503-contents? Or are ErrorDocuments just exempt 
from mod_expires action?

- Gordon @ IA

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