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Posted to users@httpd.apache.org by Gordon Mohr <go...@archive.org> on 2008/09/29 00:38:24 UTC
[users@httpd] mod_expires setting unwanted Expires on 5XX status codes
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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Re: [users@httpd] mod_expires setting unwanted Expires on 5XX status
codes
Posted by Gordon Mohr <go...@archive.org>.
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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Re: [users@httpd] mod_expires setting unwanted Expires on 5XX status codes
Posted by Nick Kew <ni...@webthing.com>.
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.
> 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.
--
Nick Kew
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