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Date: Thu, 02 Sep 2010 18:37:34 +0200
From: Ruediger Pluem <rpluem@apache.org>
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To: dev@httpd.apache.org
Subject: Re: caching partial repsonses
References: <20100711054027.9790F2388999@eris.apache.org>
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On 09/02/2010 04:09 PM, Dan Poirier wrote:
> On 2010-07-11 at 01:40, niq@apache.org wrote:
> 
>> Author: niq
>> Date: Sun Jul 11 05:40:27 2010
>> New Revision: 962985
>>  
>>    * mod_disk_cache: Decline the opportunity to cache if the response is
>>      a 206 Partial Content. This stops a reverse proxied partial response
>> @@ -214,6 +225,9 @@ PATCHES PROPOSED TO BACKPORT FROM TRUNK:
>>      Trunk patch: http://svn.apache.org/viewvc?rev=951222&view=rev
>>      2.2.x patch: http://people.apache.org/~minfrin/httpd-cache-partial-2.2.patch
>>      +1: minfrin
>> +    niq asks: I can see the logic of not cacheing partial responses,
>> +    but why should mod_disk_cache worry about them if mod_cache allows
>> +    them, as in the following proposal?
>>  
>>    *) mod_cache: Explicitly allow cache implementations to cache a 206 Partial
>>       Response if they so choose to do so. Previously an attempt to cache a 206
> 
> I think right now mod_cache doesn't let any 206 responses get to the
> cache backends, but if that change is made to let them by, then backends
> that don't correctly implement caching of 206 responses will need to
> decline to cache them themselves.
> 
> Which makes me wonder, won't other cache back-ends, like mod_mem_cache,
> need the same change?

Exactly, but mod_mem_cache is not on trunk any longer. So we cannot do
a backport here, but must write a 2.2.x specific patch that is not on trunk.

Regards

Rüdiger