[squid-users] MISSes on cacheable object

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
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
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? :)

-- 
Timur Irmatov