Squid proxy not caching anything
6,047
Oh, crap, I figured it out.
Squid ignores cache headers less than OR EQUAL TO one minute. So max-age=60 is ignored, but max-age=61 works like a charm.
<?php
Header('Cache-Control: max-age=61');
?><html>hi</html>
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Author by
Dan Fabulich
Updated on September 18, 2022Comments
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Dan Fabulich over 1 year
squid.conf:
http_access allow all # Squid normally listens to port 3128 http_port 3128 accel defaultsite=localhost no-vhost cache_peer localhost parent 80 0 no-query originserver name=myAccel cache_peer_access myAccel allow all # Uncomment and adjust the following to add a disk cache directory. cache_dir ufs /usr/local/var/cache/squid 100 16 256 # Leave coredumps in the first cache dir coredump_dir /usr/local/var/cache/squid
Squid 3.2.9, installed on OSX via Homebrew
localhost: ~ $ squid -v Squid Cache: Version 3.2.9 configure options: '--disable-debug' '--disable-dependency-tracking' '--prefix=/usr/local/Cellar/squid/3.2.9' '--localstatedir=/usr/local/var' 'CC=cc' 'CXX=c++' 'PKG_CONFIG_LIBDIR=/usr/lib/pkgconfig'
Started squid with
squid -f squid.conf -d 2 -N
The upstream is returning valid Cache-Control headers, which I've verified are correct by visiting the page in Google Chrome 26 and watching in Chrome Dev Tools.
localhost: ~ $ curl -s -o /dev/null --dump-header /dev/stdout http://localhost/test.php HTTP/1.1 200 OK Date: Tue, 16 Apr 2013 21:29:33 GMT Server: Apache/2.2.22 (Unix) DAV/2 PHP/5.3.15 with Suhosin-Patch mod_ssl/2.2.22 OpenSSL/0.9.8r X-Powered-By: PHP/5.3.15 Cache-Control: max-age=60, public Content-Length: 16 Content-Type: text/html X-Pad: avoid browser bug
But when I query the page via the Squid reverse proxy, I always get a cache miss.
localhost: ~ $ curl -s -o /dev/null --dump-header /dev/stdout http://localhost:3128/test.php HTTP/1.1 200 OK Date: Tue, 16 Apr 2013 21:29:34 GMT Server: Apache/2.2.22 (Unix) DAV/2 PHP/5.3.15 with Suhosin-Patch mod_ssl/2.2.22 OpenSSL/0.9.8r X-Powered-By: PHP/5.3.15 Cache-Control: max-age=60, public Content-Length: 16 Content-Type: text/html X-Cache: MISS from localhost Via: 1.1 localhost (squid/3.2.9) Connection: keep-alive localhost: ~ $ curl -s -o /dev/null --dump-header /dev/stdout http://localhost:3128/test.php HTTP/1.1 200 OK Date: Tue, 16 Apr 2013 21:29:38 GMT Server: Apache/2.2.22 (Unix) DAV/2 PHP/5.3.15 with Suhosin-Patch mod_ssl/2.2.22 OpenSSL/0.9.8r X-Powered-By: PHP/5.3.15 Cache-Control: max-age=60, public Content-Length: 16 Content-Type: text/html X-Cache: MISS from localhost Via: 1.1 localhost (squid/3.2.9) Connection: keep-alive
What's wrong with my configuration?
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James O'Gorman about 11 yearsThe cache-control header sets max-age to 60, which is the same as squid's default
minimum_expiry_time
- try tweaking this value in squid.
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James O'Gorman about 11 yearsOr you can tweak
maximum_expiry_time
in squid - which is recommended for this type of environment. :-) -
Dan Fabulich about 11 years
minimum_expiry_time
, yes. (You got it right in the comment to the question.)