[users@httpd] mod_proxy and mod_cache: subsequent requests not served from cache

[Elizabeth <fe...@gmail.com>]

Hello --

I'm running into a little trouble with mod_proxy and mod_cache;
thought someone here might be able to help.

I've set up one of our virtual servers to proxy requests to Eurekster,
one of our third parties, and cache them.  The proxying happens just
fine, and the caching happens just fine (see error log snippets
below), but subsequent requests don't get served out of the cache --
Apache is making a request to Eurekster every single time.

I checked out our request headers:

HTTP/1.1
Host: qa.wankelrotaryengine.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12)
Gecko/20050915 Firefox/1.0.7
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cookie: CP=null*
Cache-Control: max-age=0

Straight up: I don't know a whole lot about caching.  But that last
one, Cache-Control with a max-age of 0  -- I'm guessing that header
that's the culprit, and is essentially what's causing a new request
every time.

1. Am I right?  Or at least on the right track?
2. How to I get Apache to make requests without this header, or with a
greater max-age?  The docs imply that mod_expire might be the ticket,
so I tried playing with that but I couldn't get it to work (it could
be me, I know).

Can anyone help?  Thanks in advance!  Logs and conf are below.

best,
Elizabeth

Logs:

[Thu Mar 23 11:55:55 2006] [debug] mod_cache.c(129): Adding CACHE_SAVE
filter for /eurekster/sidebar
[Thu Mar 23 11:55:55 2006] [debug] mod_cache.c(136): Adding
CACHE_REMOVE_URL filter for /eurekster/sidebar
[Thu Mar 23 11:55:55 2006] [debug] mod_proxy_http.c(54): proxy: HTTP:
canonicalising URL //wankelrotaryengine.eurekster.com/sidebar
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(1373): [client
10.40.0.1] proxy: http: found worker
http://wankelrotaryengine.eurekster.com/ for
http://wankelrotaryengine.eurekster.com/sidebar?seckey=wankelrotaryengine123456&groupkey=blah
[Thu Mar 23 11:55:55 2006] [debug] mod_proxy.c(736): Running scheme
http handler (attempt 0)
[Thu Mar 23 11:55:55 2006] [debug] mod_proxy_http.c(1661): proxy:
HTTP: serving URL
http://wankelrotaryengine.eurekster.com/sidebar?seckey=wankelrotaryengine123456&groupkey=blah
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(1754): proxy: HTTP:
has acquired connection for (wankelrotaryengine.eurekster.com)
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(1811): proxy:
connecting http://wankelrotaryengine.eurekster.com/sidebar?seckey=wankelrotaryengine123456&groupkey=blah
to wankelrotaryengine.eurekster.com:80
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(1911): proxy:
connected /sidebar?seckey=wankelrotaryengine123456&groupkey=blah to
wankelrotaryengine.eurekster.com:80
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(2005): proxy: HTTP:
fam 2 socket created to connect to wankelrotaryengine.eurekster.com
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(2101): proxy: HTTP:
connection complete to 66.70.119.205:80
(wankelrotaryengine.eurekster.com)
[Thu Mar 23 11:55:55 2006] [debug] mod_proxy_http.c(1443): proxy:
start body send
[Thu Mar 23 11:55:55 2006] [debug] mod_deflate.c(447): [client
10.40.0.1] Zlib: Compressed 336 to 198 : URL /eurekster/sidebar
[Thu Mar 23 11:55:55 2006] [debug] mod_headers.c(612): headers:
ap_headers_output_filter()
[Thu Mar 23 11:55:55 2006] [debug] mod_cache.c(602): cache: Caching
url: /eurekster/sidebar?seckey=wankelrotaryengine123456&groupkey=blah
[Thu Mar 23 11:55:55 2006] [debug] mod_cache.c(608): cache: Removing
CACHE_REMOVE_URL filter.
[Thu Mar 23 11:55:55 2006] [debug] mod_disk_cache.c(954): disk_cache:
Stored headers for URL
http://_default_:80/eurekster/sidebar?seckey=wankelrotaryengine123456&groupkey=blah
[Thu Mar 23 11:55:55 2006] [debug] mod_disk_cache.c(1035): disk_cache:
Body for URL http://_default_:80/eurekster/sidebar?seckey=wankelrotaryengine123456&groupkey=blah
cached.
[Thu Mar 23 11:55:55 2006] [debug] mod_proxy_http.c(1530): proxy: end body send
[Thu Mar 23 11:55:55 2006] [debug] proxy_util.c(1769): proxy: HTTP:
has released connection for (wankelrotaryengine.eurekster.com)



Conf:

<VirtualHost *:80>
ServerName qa.wankelrotaryengine.com

<IfModule mod_proxy.c>

  ProxyRequests Off

  <Proxy *>
  Order deny,allow
  Allow from all
  </Proxy>

  ProxyPass /eurekster/ http://wankelrotaryengine.eurekster.com/
  ProxyPassReverse /eurekster/ http://wankelrotaryengine.eurekster.com/
  ExpiresDefault "access plus 900 seconds"
  ExpiresActive Off

  CacheRoot /cache/WRE
  CacheEnable disk /eurekster/sidebar
  CacheDefaultExpire 900
  CacheMaxExpire 900
  CacheIgnoreCacheControl On
  CacheIgnoreNoLastMod On
  CacheStoreNoStore On
  CacheStorePrivate On
</IfModule>

Options None
</VirtualHost>

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