Re: [squid-users] MISSes on cacheable object

On 21/04/2014 5:10 p.m., Timur Irmatov wrote:
> Hi.
>
> I am trying to understand why my Squid 3.4 refuses to cache some URLs.
> Here is an example:
>
> curl -I http://guard.cdnmail.ru/GuardMailRu.exe
> HTTP/1.1 200 OK
> Server: nginx
> Date: Mon, 21 Apr 2014 05:02:28 GMT
> Content-Type: application/octet-stream
> Last-Modified: Fri, 04 Apr 2014 14:34:09 GMT
> Accept-Ranges: bytes
> Content-Length: 6779936
> X-Cache: MISS from 1
> Connection: keep-alive
>
> As you see, response does not have explicit lifetime so it should be
> cacheable based on Last-Modified and refresh_pattern directive. My
> config is:
>
> cache_effective_user proxy
> acl clients src X.X.X.X/Y
> acl CONNECT method CONNECT
> http_access deny CONNECT
> http_access allow localhost manager
> http_access deny manager
> http_access allow clients
> http_access allow localhost
> http_access deny all
> http_port 3128
> http_port 3129 tproxy

Possibility #1:
 Is you cache.log containing any messages about Host header forgery?
Traffic suspected of forgery is not cached, in order to avoid poisoning
other clients.

> cache_dir ufs /srv/squid3/1 90000 16 256
> cache_dir ufs /srv/squid3/2 90000 16 256
> cache_dir ufs /srv/squid3/3 90000 16 256
> cache_dir ufs /srv/squid3/4 90000 16 256
> cache_dir ufs /srv/squid3/5 490000 16 256
> store_dir_select_algorithm round-robin
> maximum_object_size 100 MB

Possibility #2:
 Object size limits need to be set in or before the cache_dir lines. The
default limit is 4MB and I notice your test object is over 6MB.

> coredump_dir /opt/squid/var/cache/squid
> refresh_pattern ^ftp: 1440 20% 10080
> refresh_pattern ^gopher: 1440 0% 1440
> refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
> refresh_pattern . 0 20% 86400
> via off
> global_internal_static off
> dns_nameservers 192.168.0.1
> dns_v4_first on
> forwarded_for transparent
> visible_hostname 1
> unique_hostname 1
> store_id_program /opt/squid/etc/helpers/storeid /opt/squid/etc/cacheurl.config
> store_id_children 1 startup=1 idle=1 concurrency=1000
>
> When I repeatedly request aforementioned URL with wget I consistently
> get TCP_MISS. What am I doing wrong? :)
>

Possibility #3:
 Your test tool may be sending headers to Squid telling it not to use
the cached object. Curl is known for this. You will need to check the
*request* header for Cache-Control to see this.

Amos
Received on Mon Apr 21 2014 - 05:32:53 MDT