[squid-users] vary headers

[Hussam Al-Tayeb]

> Sent: Monday, May 04, 2015 at 6:32 PM
> From: "Amos Jeffries" <squid3 at treenet.co.nz>
> To: "Hussam Al-Tayeb" <hussam.tayeb at gmx.com>
> Cc: squid-users at lists.squid-cache.org
> Subject: Re: [squid-users] vary headers
>
> On 5/05/2015 3:15 a.m., Hussam Al-Tayeb wrote:
> > 
> > 
> >> Sent: Monday, May 04, 2015 at 12:49 PM
> >> From: "Amos Jeffries" <squid3 at treenet.co.nz>
> >> To: squid-users at lists.squid-cache.org
> >> Subject: Re: [squid-users] vary headers
> >>
> >> On 4/05/2015 6:54 a.m., Hussam Al-Tayeb wrote:
> >>>> Sent: Sunday, May 03, 2015 at 9:45 PM
> >>>> From: "Yuri Voinov"
> >>>
> >>>>
> >>>> I understand what do your want. But for what?
> >>>>>
> >>>
> >>> because a "wget --server-response http://someurl" operation that
> >>> replies with a "Vary: user-agent" header always results in a MISS
> >>> even if the same wget version (same user-agent) and computer.
> >>> Instead, multiple copies of the file are stored.
> >>
> >> That is not right, the wget being used twice should be MISS then HIT,
> >> just like any oter cacheable traffic.
> >>
> >> The nasty thing with Vary:User-Agent is that browsers UA string embeds
> >> so much plugin info they are changing between each different client
> >> request. Which defeats the purpose of caching one clients reply for use
> >> by other clients.
> >>
> >> NP: what you had with the store_miss should be working.
> >>  Are you using Squid-3.5 ?
> >>  How are you identifying a fail ?
> >>
> 
> > Hello. I am using 3.5.4
> > There are new objects on disk that have the Vary: User-Agent Http header.
> > I can tell for example if type head -n13 /home/squid/04/D1/0004D122
> > 
> 
> That is not a good way to identify. All it means is that the object used
> a disk file for its transfer. Cache files are also sometimes used as
> on-disk buffers.
> 
> If you check with store.log for ID (0004D122) you should expect to see
> that file pushed to disk, then a cache index RELEASED action performed.
> The file part may stay on disk until something else needs to use the
> same filename.
> 
> The ways to identify caching activity is:
>  * access.log - checking that no HIT or REFRESH occur on the relevant
> URLs, or
>  * store.log - checking that objects with the URLs are all getting that
> RELEASED action.
>  * cache.log - setting "debug_options 20,3" and watching for "store_miss
> prohibits caching"
> 
> There is unfortunatly currently no easy debugs linking what URL
> store_miss prohibited to correlate the logs :-(
> 
> Amos
> 
> 
> 
> 
ok, I tried setting debug_options.
this is part of what I found:
http://pastebin.com/raw.php?i=4HTw9es3

So it looks like it only blocks caching of Vary header if followed by "Accept-Encoding: gzip,deflate"?