Re: [squid-users] squid cache TCP_REFRESH_MODIFIED

On 2/18/2012 10:02 AM, Amos Jeffries wrote:
> On 18/02/2012 12:26 a.m., parashuram wrote:
>> Hi all,
>> I am using squid to cache dynamic responses from my particular server
>>
>> everything working fine,
>> When I make first request access.log has
>> 1329473470.110 0 192.168.0.40 TCP_MISS/200 856 GET
>> http://[ipv6address]:8080/.well-known/core - DIRECT/::1 text/html
>>
>> Next request it logs following
>> 1329473479.050 0 192.168.0.40 TCP_REFRESH_MODIFIED/200 856 GET
>> http://[ipv6address]:8080/.well-known/core - DIRECT/::1 text/html
>>
>> request is in cache but due to resources being changed response is
>> from origin server( I've ignored must revalidated in refresh
>> pattern). I wanted request should be served from cache even if its
>> modified and log TCP_HIT or TCP_MEM_HIT in access.log.
>> any idea what might be going wrong??? suggestion how to tell squid
>> not send revalidiate signal to origin server to cross check for
>> resource modification???
>>
>> server header response is as follows
>>
>> (Status-Line) HTTP/1.0 200 OK
>> Date Fri, 17 Feb 2012 10:11:19 GMT
>> Content-Type text/html
>> Last-Modified Wed, 15 Feb 2012 07:48:34 GMT
>> Accept-Ranges bytes
>> Content-Lenght 8334
>> Cache-Control max-age=86400,public
>
> Notice how "must-revalidate" is not present. Your override turing it
> off does nothing.
>
> What is happening here is that max-age is specifying that the object
> is stale when older than 1 day, and needs revalidatating. (Date minus
> Last-Modified) is stating that it is currently 2 days old.
Thanks for reply, Now current Header is a follows

(Status-Line) HTTP/1.0 200 OK
Date Mon, 20 Feb 2012 04:39:10 GMT
Content-Type text/html
Last-Modified Mon ,20 Feb 2012 04:29:10 GMT
Accept-Ranges bytes
Content-Lenght 8334
Cache-Control max-age=86400,public
Expires Tue, 21 Feb 2012 04:29:10 GMT
X-Cache MISS from colinux
Via 1.0 colinux (squid/3.1.18)
Connection close

But still it logs as TCP_REFRESH_MODIFIED for my server, but other web
pages (i.e www.squid-cache.org ) showing TCP_MEM_HIT with same response
header.
> Squid is only performing a REFRESH (if-modified-since) check, this is
> very efficient if the server supports
Is it possible to disable REFRESH(if-modified-since) check. ?? if so how??

-- 
Regards,
Parashuram
Systems Engineer
Accord Software&  systems Pvt Ltd
Division : GNSS&  Systems
www.accord-soft.com
Mobile   : +91-81471 93134
Extn     : 227
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