Re: [squid-users] Re: Question about Expires header and TCP_REFRESH_HIT

Piotr Ślatała wrote:
> Hi,
> it's me again. Due to the fact, that no one responded to this email, I
> will resend it.. If I wasn't clear in stating a problem, please write me,
> I will try to explain it again. I just don't know how to force squid to
> change expires header after receiving 304 not modified from server ... :(
>

Upgrade?

http://www.squid-cache.org/bugs/show_bug.cgi?id=7

Amos

> Regards,
> Peter
>> Hi,
>> I'm using: Squid Cache: Version 2.6.STABLE13
>>
>> I'm caching in accelerator mode(or should I say - reverse proxy), for
>> example pictures, with 6hours expiry time. After this time, I'd like cache
>> to check newer versions. I use refresh_pattern:
>>
>> refresh_pattern -i \.gif$ 60 90% 720 override-expire override-lastmod
>> ignore-reload
>>
>> I've been also trying without override-expire(and lastmod). The problem
>> is, after 6 hours, cache do invalidate its content, but receives 304 Not
>> Modified from server and doesn't change expires date:
>> 1220889578.703 10 83.31.43.112 TCP_REFRESH_HIT/200 1538 GET
>> http://mypage/mypicture.gif - FIRST_UP_PARENT/front2 image/gif
>>
>> Today, 2008-09-09, I have in headers:
>> http://mypage/mypicture.gif
>>
>> GET /mypicture.gif HTTP/1.1
>> Host: mypage
>> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; pl; rv:1.8.1.16)
>> Gecko/20080702 Firefox/2.0.0.16
>> Accept:
>> text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
>> Accept-Language: pl,en-us;q=0.7,en;q=0.3
>> Accept-Encoding: gzip,deflate
>> Accept-Charset: ISO-8859-2,utf-8;q=0.7,*;q=0.7
>> Keep-Alive: 300
>> Connection: keep-alive
>> If-Modified-Since: Fri, 05 Sep 2008 06:49:18 GMT
>> If-None-Match: "613727-77eff780"
>>
>> HTTP/1.x 304 Not Modified
>> Date: Fri, 05 Sep 2008 07:56:18 GMT
>> Content-Type: image/gif
>> Expires: Fri, 05 Sep 2008 13:56:18 GMT
>> Last-Modified: Fri, 05 Sep 2008 06:49:18 GMT
>> Etag: "613727-77eff780"
>> Age: 15380
>> X-Cache: HIT from mypage
>> X-Cache-Lookup: HIT from mypage:3128
>> Via: 1.0 mypage:3128 (squid/2.6.STABLE13)
>> Connection: keep-alive
>> ----------------------------------------------------------
>>
>> Especially:
>> Date: Fri, 05 Sep 2008 07:56:18 GMT
>> Expires: Fri, 05 Sep 2008 13:56:18 GMT
>> Expires is 6 hours after Date, as You can see, but, today we have
>> 2008-09-09 :) When I turn off the squid, I also receive 304 Not Modified,
>> but with valid expiry time:
>>
>> http://mypage/mypicture.gif
>>
>> GET /mypicture.gif HTTP/1.1
>> Host: mypage
>> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; pl; rv:1.8.1.16)
>> Gecko/20080702 Firefox/2.0.0.16
>> Accept:
>> text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
>> Accept-Language: pl,en-us;q=0.7,en;q=0.3
>> Accept-Encoding: gzip,deflate
>> Accept-Charset: ISO-8859-2,utf-8;q=0.7,*;q=0.7
>> Keep-Alive: 300
>> Connection: keep-alive
>> If-Modified-Since: Fri, 05 Sep 2008 06:49:18 GMT
>> If-None-Match: "613727-77eff780"
>>
>> HTTP/1.x 304 Not Modified
>> Date: Tue, 09 Sep 2008 08:52:24 GMT
>> Server: Apache
>> Connection: Keep-Alive
>> Keep-Alive: timeout=5, max=500
>> Etag: "613727-77eff780"
>> Expires: Tue, 09 Sep 2008 14:52:24 GMT
>> Cache-Control: max-age=21600, must-revalidate
>> ----------------------------------------------------------
>>
>>
>> Do You have any idea why it behaves this way? I found something similar:
>> http://www1.uk.squid-cache.org/mail-archive/squid-users/200602/0305.html
>> but this topic has no clues. How can I force squid to change expiry time?
>> Is there any other way, than disabling 304 in Apache?
>>
>> Best Regards,
>> Peter
>>
>>
>
>

-- 
Please use Squid 2.7.STABLE4 or 3.0.STABLE9