[squid-users] Negative Caching not working on 3.1.6?

Hi Curl,

�� � I'm trying configure squid to cache everything for a minimum
amount of time, no matter what (I release this is a bit of a
bastardization of it's purpose and of the http spec -- I'm trying to
use it as a cache for another program I'm working on, in a space where
this is reasonable).

�� � I can't seem to make negative caching work -- below are (1) the
send and receive headers from a curl request for a URL that 404s,
twice (to show that the second is a cache miss), (2) version
information (of squid and my box), (3) my squid.conf file, and (4) my
access, cache, and store logs. These are all from a fresh install on a
new box.

�� � Any ideas?

Thanks,

Chas Williams

P.S. for bonus points, can anyone tell me if my squid.conf will really
cache everything for at least 240 minutes?

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ubuntu_at_domU-12-31-39-0C-81-A1:~$ curl -x localhost:3128 -v
"http://hotelburst.es/robots.txt" >/dev/null
* About to connect() to proxy localhost port 3128 (#0)
* � Trying 127.0.0.1... � % Total � �% Received % Xferd �Average Speed
� Time � �Time � � Time �Current
�� � � � � � � � � � � � � � � � Dload �Upload � Total � Spent � �Left �Speed
��0 � � 0 � �0 � � 0 � �0 � � 0 � � �0 � � �0 --:--:-- --:--:--
--:--:-- � � 0connected
* Connected to localhost (127.0.0.1) port 3128 (#0)
> GET�http://hotelburst.es/robots.txt%a0HTTP/1.1
> User-Agent: curl/7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4�libidn/1.18
> Host:�hotelburst.es
> Accept: */*
> Proxy-Connection: Keep-Alive
>
* HTTP 1.0, assume close after body
< HTTP/1.0 404 Not Found
< Date: Thu, 30 Dec 2010 21:18:14 GMT
< Server: Apache/2.2.3 (Debian) mod_jk/1.2.18 mod_python/3.2.10
Python/2.4.4 PHP/5.2.0-8+etch15 mod_ssl/2.2.3 OpenSSL/0.9.8c
mod_perl/2.0.2 Perl/v5.8.8
< Content-Length: 406
< Content-Type: text/html; charset=iso-8859-1
< X-Cache: MISS from localhost
< X-Cache-Lookup: MISS from localhost:3128
< Via: 1.0 localhost (squid/3.1.6)
* HTTP/1.0 proxy connection set to keep alive!
< Proxy-Connection: keep-alive
<
{ [data not shown]
100 � 406 �100 � 406 � �0 � � 0 � 1303 � � �0 --:--:-- --:--:--
--:--:-- �1309* Connection #0 to host localhost left intact
* Closing connection #0
ubuntu_at_domU-12-31-39-0C-81-A1:~$ curl -x localhost:3128 -v
"http://hotelburst.es/robots.txt" >/dev/null
* About to connect() to proxy localhost port 3128 (#0)
* � Trying 127.0.0.1... � % Total � �% Received % Xferd �Average Speed
� Time � �Time � � Time �Current
�� � � � � � � � � � � � � � � � Dload �Upload � Total � Spent � �Left �Speed
��0 � � 0 � �0 � � 0 � �0 � � 0 � � �0 � � �0 --:--:-- --:--:--
--:--:-- � � 0connected
* Connected to localhost (127.0.0.1) port 3128 (#0)
> GET�http://hotelburst.es/robots.txt%a0HTTP/1.1
> User-Agent: curl/7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4�libidn/1.18
> Host:�hotelburst.es
> Accept: */*
> Proxy-Connection: Keep-Alive
>
* HTTP 1.0, assume close after body
< HTTP/1.0 404 Not Found
< Date: Thu, 30 Dec 2010 21:18:16 GMT
< Server: Apache/2.2.3 (Debian) mod_jk/1.2.18 mod_python/3.2.10
Python/2.4.4 PHP/5.2.0-8+etch15 mod_ssl/2.2.3 OpenSSL/0.9.8c
mod_perl/2.0.2 Perl/v5.8.8
< Content-Length: 406
< Content-Type: text/html; charset=iso-8859-1
< X-Cache: MISS from localhost
< X-Cache-Lookup: HIT from localhost:3128
< Via: 1.0 localhost (squid/3.1.6)
* HTTP/1.0 proxy connection set to keep alive!
< Proxy-Connection: keep-alive
<
{ [data not shown]
100 � 406 �100 � 406 � �0 � � 0 � 3992 � � �0 --:--:-- --:--:--
--:--:-- �4060* Connection #0 to host localhost left intact
* Closing connection #0
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ubuntu_at_domU-12-31-39-0C-81-A1:~$ squid3 -v
Squid Cache: Version 3.1.6
configure options: �'--build=x86_64-linux-gnu' '--prefix=/usr'
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' '--sysconfdir=/etc'
'--localstatedir=/var' '--libexecdir=${prefix}/lib/squid3'
'--disable-maintainer-mode' '--disable-dependency-tracking'
'--disable-silent-rules' '--srcdir=.' '--datadir=/usr/share/squid3'
'--sysconfdir=/etc/squid3' '--mandir=/usr/share/man'
'--with-cppunit-basedir=/usr' '--enable-inline' '--enable-async-io=8'
'--enable-storeio=ufs,aufs,diskd' '--enable-removal-policies=lru,heap'
'--enable-delay-pools' '--enable-cache-digests' '--enable-underscores'
'--enable-icap-client' '--enable-follow-x-forwarded-for'
'--enable-auth=basic,digest,ntlm,negotiate'
'--enable-basic-auth-helpers=LDAP,MSNT,NCSA,PAM,SASL,SMB,YP,DB,POP3,getpwnam,squid_radius_auth,multi-domain-NTLM'
'--enable-ntlm-auth-helpers=smb_lm,'
'--enable-digest-auth-helpers=ldap,password'
'--enable-negotiate-auth-helpers=squid_kerb_auth'
'--enable-external-acl-helpers=ip_user,ldap_group,session,unix_group,wbinfo_group'
'--enable-arp-acl' '--enable-esi' '--disable-translation'
'--with-logdir=/var/log/squid3' '--with-pidfile=/var/run/squid3.pid'
'--with-filedescriptors=65536' '--with-large-files'
'--with-default-user=proxy' '--enable-linux-netfilter'
'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -g -Wall -O2'
'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS=' 'CXXFLAGS=-g -O2 -g
-Wall -O2' --with-squid=/build/buildd/squid3-3.1.6

ubuntu_at_domU-12-31-39-0C-81-A1:~$ cat /etc/issue
Ubuntu 10.10 \n \l
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ubuntu_at_domU-12-31-39-0C-81-A1:~$ sudo cat /etc/squid3/squid.conf
######################################
# Squid3 config for crawl v2 machines
######################################
#Access control
acl manager proto cache_object
acl localhost src�127.0.0.1/32
acl to_localhost dst�127.0.0.0/8
acl SSL_ports port 443
acl Safe_ports port 80 � � � � �# http
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access deny all
icp_access deny all
htcp_access deny all
http_port 3128
#Force minimum cache time for everything
refresh_pattern . 240 999999% 1440 override-expire override-lastmod
ignore-no-cache ignore-no-store ignore-private ignore-must-revalidate
#Cache 404s as well
negative_ttl 240 minutes
#No neighbor caches
icp_port 0
cache_mem 256 MB
cache_dir ufs /mnt/cache 1000 16 256
access_log /var/log/squid3/access.log squid
cache_log /var/log/squid3/cache.log
cache_store_log /var/log/squid3/store.log
coredump_dir /var/spool/squid3

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ubuntu_at_domU-12-31-39-0C-81-A1:~$ sudo cat /var/log/squid3/access.log
1293743891.380 � �309 127.0.0.1 TCP_MISS/404 822 GET
http://hotelburst.es/robots.txt%a0- DIRECT/85.25.120.108�text/html
1293743893.629 � � 99 127.0.0.1 TCP_MISS/404 821 GET
http://hotelburst.es/robots.txt%a0- DIRECT/85.25.120.108�text/html

ubuntu_at_domU-12-31-39-0C-81-A1:~$ sudo cat /var/log/squid3/cache.log
2010/12/30 21:17:45| � � � � 0 Objects expired.
2010/12/30 21:17:45| � � � � 0 Objects cancelled.
2010/12/30 21:17:45| � � � � 0 Duplicate URLs purged.
2010/12/30 21:17:45| � � � � 0 Swapfile clashes avoided.
2010/12/30 21:17:45| � Took 0.01 seconds ( �0.00 objects/sec).
2010/12/30 21:17:45| Beginning Validation Procedure
2010/12/30 21:17:45| � Completed Validation Procedure
2010/12/30 21:17:45| � Validated 25 Entries
2010/12/30 21:17:45| � store_swap_size = 0
2010/12/30 21:17:46| storeLateRelease: released 0 objects

ubuntu_at_domU-12-31-39-0C-81-A1:~$ sudo cat /var/log/squid3/store.log
1293743893.629 RELEASE -1 FFFFFFFF 9D744644E77923213EBD01054E48C903
404 1293743894 � � � �-1 � � � �-1 text/html 406/406 GET
http://hotelburst.es/robots.txt
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Received on Thu Dec 30 2010 - 21:37:23 MST