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Date: Wed, 06 Nov 2013 14:52:42 +0100
From: Reindl Harald <h.reindl@thelounge.net>
Organization: the lounge interactive design
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To: users@trafficserver.apache.org
Subject: Re: Rare HIT
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Am 05.11.2013 16:34, schrieb Leif Hedstrom:
> On Nov 5, 2013, at 12:01 AM, Omid Kosari <omidkosari@yahoo.com> wrote:
>=20
>> I am trying to test ATS performance . In a normal test i checked sever=
al urls
>> with three browsers and looking in /var/log/trafficserver/squid.log .
>> for example i loaded following url one time with firefox , another tim=
e with
>> google chrome and another time with IE .
>> http://upload.wikimedia.org/wikipedia/commons/2/28/Clouds_Blue_Sky_001=
=2Ejpg
>=20
> A guess would be that you get hit by this:
>=20
> 	https://issues.apache.org/jira/browse/TS-2245
>=20
> I just landed this on master, so give it a test. You would need to set =
the configs to =932=94 for it to be safe. What I suspect happens in your =
case is that the various browsers are differing on what they send for Acc=
ept-Language: or one of the other Accept-* headers.
>=20
> I=92m thinking for v5.0.0, we want to make at least these three configu=
rations the default:
>=20
> 	CONFIG proxy.config.http.cache.ignore_accept_language_mismatch INT 2
> 	CONFIG proxy.config.http.cache.ignore_accept_encoding_mismatch INT 2
> 	proxy.config.http.cache.ignore_accept_charset_mismatch INT 2
>=20
> There are use cases for both the =930=94 setting and the =931=94 settin=
g, but the most sane behavior IMO is the above.=20
> But we can=92t make this change in the v4.x release cycle, since it=92s=
 technically an incompatible configuration change=20
> (it does change the behavior)

i am not sure now if 2 is still supported and only the default will chang=
e
looking at the description and my explicit origin-config "2" will ineed
be the best option because i remove "Vary" explicit for static files and
for extensions which are handeled with mod_deflate after hat add a vary
for "Accept-Encoding"

currently the settings are at "1" here because "Cache-Control: public, pr=
oxy-revalidate"
and ETAG-headers on each dynamic page, but "2" would be perfect

* images are never gzip-compressed -> only one version needs to be cached=

* static documents which may be compressed -> Vary on encdoing but not us=
er-agent
* php-files -> Vary: Accept-Encoding,User-Agent because they may generate=
 different content
___________________________________________________________________

I'm thinking we could turn the existing configuration options to trie-sta=
te configs:

0 - Client header is used / honored even in the absence of Vary: header f=
rom origin (this is default behavior)
1 - Client header is never used when performing the default alternate sel=
ection.
2 - Client header is not used in alternate selection if there is no Vary:=
 from origin specifying to use it
___________________________________________________________________

# Properly handle requests behind proxies
<IfModule mod_headers.c>
 <FilesMatch "\.(php)$">
  Header append "Vary" "User-Agent"
 </FilesMatch>
 <FilesMatch
"\.(gif|jpe?g|png|htm|html|xml|sgm|sgml|css|js|txt|htc|ico|flv|mp4|m4v|wm=
v|mov|mpg|ogv|webm|mp3|wav|ogg|oga|swf|doc|docx|xls|xlsx|ppt|pptx|pdf|eot=
|ttf|otf|woff)$">
  Header unset "Vary"
 </FilesMatch>
 <FilesMatch "\.(htm|html|xml|sgm|sgml|css|js|txt|htc|wav|doc|docx|xls|xl=
sx|ppt|pptx|pdf|eot|ttf|otf|woff)$">
  Header set "Vary" "Accept-Encoding"
 </FilesMatch>
</IfModule>


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