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Re: inconsistency with objects in squid cache

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On 8/04/2014 2:02 a.m., Sylvio Cesar wrote:
> 2014-04-06 13:46 GMT-03:00, Eliezer Croitoru <eliezer@xxxxxxxxxxxx>:
>> On 04/06/2014 05:29 PM, Sylvio Cesar wrote:
>>> but this happens only in the network 10.21.155.0/24.
>> then squid.conf and the debug_options output would help to understand if
>> it is the reason or there is another reason.
>>
>> Eliezer
>>
> 
> Hi Eliezer,
> 
>     I noticed that when there is the header "Vary:
> Accept-Encoding,User-Agent" the object is not cached.

The object *is* cached...

> ------
> 
> KEY 7351B3AA6DB80247DE63873CAB59CFE8
>         STORE_OK      IN_MEMORY     SWAPOUT_DONE PING_DONE
>         CACHABLE,DISPATCHED,VALIDATED

Note the "CACHEABLE" and "STORE_OK" and "SWAPOUT_DONE".

>         LV:1396873562 LU:1396873566 LM:1394577094 EX:-1
>         0 locks, 0 clients, 1 refs
>         Swap Dir 0, File 0X000001
>         GET http://xxx.example/video/video.flv
>         vary_headers: accept-encoding,
> user-agent="curl%2F7.19.0%20(i686-suse-linux-gnu)%20libcurl%2F7.19.0%20OpenSSL%2F0.9.8h%20zlib%2F1.2.3%20libidn%2F1.10"

However only a client which sends the *exact* headers marked above will
be able to fetch it.

>         inmem_lo: 0
>         inmem_hi: 15089604
>         swapout: 15089604 bytes queued
> 
> 
> KEY E08FBDC74EAD09CEBCC38380DACCF63F
>         STORE_OK      IN_MEMORY     SWAPOUT_DONE PING_NONE
>         CACHABLE,VALIDATED
>         LV:1396873566 LU:1396873566 LM:-1        EX:1396973566
>         0 locks, 0 clients, 0 refs
>         Swap Dir 0, File 00000000
>         GET http://xxx.example/video/video.flv
>         inmem_lo: 0
>         inmem_hi: 227
>         swapout: 227 bytes queued
> 
> 
> How to make squid perform the object cache when found in the header
> "Vary: Accept-Encoding,User-Agent"???
> 

Always fetch using the same browser agent. Any time the Accept-Encoding
OR User-Agent header changes (even by 1 byte) a new object will be
fetched and cached.
 ... this is not a reasonable thing for real users to do. They all
choose a mix of browsers, players and versions.

Alternatively if you have control over the web server it needs
redesigning in a way that prevents Vary:User-Agent from being sent.

Amos




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