[squid-users] Why not cached ?

I was wondering about very few HITs in this squid installation, and did some
checking:

access.log:
1401203150.334 1604 10.1.10.121 TCP_MISS/200 718707 GET
http://l5.yimg.com/av/moneyball/ads/0-1399331780-5313.jpg -
ORIGINAL_DST/66.196.65.174 image/jpeg
1401203186.100 1327 10.1.10.121 TCP_MISS/200 718707 GET
http://l5.yimg.com/av/moneyball/ads/0-1399331780-5313.jpg -
ORIGINAL_DST/66.196.65.174 image/jpeg

cache.log:
2014/05/27 14:52:12 kid1| Starting Squid Cache version 3.4.5-20140514-r13135
for i686-pc-linux-gnu...
2014/05/27 14:52:12 kid1| Process ID 7477
2014/05/27 14:52:12 kid1| Process Roles: worker
2014/05/27 14:52:12 kid1| With 1024 file descriptors available
2014/05/27 14:52:12 kid1| Initializing IP Cache...
2014/05/27 14:52:12 kid1| DNS Socket created at [::], FD 7
2014/05/27 14:52:12 kid1| DNS Socket created at 0.0.0.0, FD 8
2014/05/27 14:52:12 kid1| Adding nameserver 127.0.0.1 from /etc/resolv.conf
2014/05/27 14:52:12 kid1| Logfile: opening log
daemon:/tmp/var/log/squid/access.log
2014/05/27 14:52:12 kid1| Logfile Daemon: opening log
/tmp/var/log/squid/access.log
2014/05/27 14:52:12 kid1| Logfile: opening log
daemon:/tmp/var/log/squid/store.log
2014/05/27 14:52:12 kid1| Logfile Daemon: opening log
/tmp/var/log/squid/store.log
2014/05/27 14:52:12 kid1| Swap maxSize 0 + 2097152 KB, estimated 161319
objects
2014/05/27 14:52:12 kid1| Target number of buckets: 8065
2014/05/27 14:52:12 kid1| Using 8192 Store buckets
2014/05/27 14:52:12 kid1| Max Mem size: 2097152 KB
2014/05/27 14:52:12 kid1| Max Swap size: 0 KB
2014/05/27 14:52:12 kid1| Using Least Load store dir selection
2014/05/27 14:52:12 kid1| Set Current Directory to /tmp
2014/05/27 14:52:12 kid1| Finished loading MIME types and icons.
2014/05/27 14:52:12 kid1| HTCP Disabled.
2014/05/27 14:52:12 kid1| Squid plugin modules loaded: 0
2014/05/27 14:52:12 kid1| Accepting HTTP Socket connections at
local=10.1.10.1:3129 remote=[::] FD 13 flags=9
2014/05/27 14:52:12 kid1| Accepting NAT intercepted HTTP Socket connections
at local=10.1.10.1:3128 remote=[::] FD 14 flags=41
2014/05/27 14:52:13 kid1| storeLateRelease: released 0 objects

squid.conf:
root_at_voyage:/usr/local/squid/etc# vi squid.conf
acl localnet src 10.0.0.0/8 # RFC1918 possible internal network

acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http

acl SSL_ports port 443
acl CONNECT method CONNECT
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access deny manager
http_access allow localnet
http_access allow localhost
http_access deny all
http_port 10.1.10.1:3129
http_port 10.1.10.1:3128 intercept
cache_mem 2048 MB
memory_cache_mode always
access_log daemon:/tmp/var/log/squid/access.log squid
cache_store_log daemon:/tmp/var/log/squid/store.log squid
logfile_rotate 3
pid_filename /var/run/squid.pid
cache_log /tmp/var/log/squid/cache.log
coredump_dir /tmp
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 0 20% 4320
shutdown_lifetime 10 seconds

This quid is running on a scaled down debian, no HDD, with mobile internet
connection. So /tmp in fact is a RAM-disk, and a good hit rate very welcome.
The example above should be cachable, or not ? squid was accessed on port
3128, intercept.

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