Hello all
I've set up apache 2.2.3 as a caching reverse proxy. Another
server behind my apache installation sends cachable responses.
My apache server caches all the appropriate responses, but it
doesn't use the cache entries for some of them even if they
are cached and fresh.
For those cache entries which are fresh but which are ignored
by apache a request (non conditional) is made back to the origin
server. Then apache receives the response, it caches the response
and the cycle repeats.
For those who want to express their opinion I send here the response
headers of two independent requests, each of them being sent to the
origin server and to the proxy. So there are 4 responses below.
1.1) The first request sent to the origin server.
-------------------------------------------------
(NOTE: This request is NOT cached if I send it to the proxy server)
cristi@griffo:~/dev/apache-httpd-2.2.3/i1/var/zope$ wget -S --delete-after 'http://localhost:9080/ulisse/portal_javascripts/Plone Tableless/ploneScripts4205.js'
--12:01:36-- http://localhost:9080/ulisse/portal_javascripts/Plone%20Tableless/ploneScripts4205.js
=> `ploneScripts4205.js'
Resolving localhost... 127.0.0.1
Connecting to localhost|127.0.0.1|:9080... connected.
HTTP request sent, awaiting response...
HTTP/1.0 200 OK
Server: Zope/(Zope 2.8.6-final, python 2.4.2, linux2) ZServer/1.1 Plone/Unknown
Date: Fri, 10 Nov 2006 11:01:36 GMT
Content-Length: 92138
Accept-Ranges: bytes
Expires: Fri, 17 Nov 2006 11:01:36 GMT
Last-Modified: Fri, 10 Nov 2006 11:01:36 GMT
Connection: Keep-Alive
Cache-Control: max-age=604800
Content-Type: application/x-javascript;charset=utf-8
Length: 92,138 (90K) [application/x-javascript]
Removing ploneScripts4205.js.
1.2) The first request sent to the proxy.
-------------------------------------------------------------------
(NOTE: The request was not cached)
cristi@griffo:~/dev/apache-httpd-2.2.3/i1/var/zope$ wget -S --delete-after 'http://localhost:9999/portal_javascripts/Plone Tableless/ploneScripts4205.js'
--12:04:37-- http://localhost:9999/portal_javascripts/Plone%20Tableless/ploneScripts4205.js
=> `ploneScripts4205.js'
Resolving localhost... 127.0.0.1
Connecting to localhost|127.0.0.1|:9999... connected.
HTTP request sent, awaiting response...
HTTP/1.1 200 OK
Date: Fri, 10 Nov 2006 11:04:37 GMT
Server: Zope/(Zope 2.8.6-final, python 2.4.2, linux2) ZServer/1.1 Plone/Unknown
Content-Length: 92131
Accept-Ranges: bytes
Expires: Fri, 17 Nov 2006 11:04:37 GMT
Last-Modified: Fri, 10 Nov 2006 11:04:37 GMT
Cache-Control: max-age=604800
Content-Type: application/x-javascript;charset=utf-8
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Length: 92,131 (90K) [application/x-javascript]
Removing ploneScripts4205.js.
2.1 The second request sent to the origin server
-------------------------------------------------
cristi@griffo:~/dev/apache-httpd-2.2.3/i1/var/zope$ date; wget -S --delete-after 'http://localhost:9080/ulisse/controluce'; date
Fri Nov 10 12:10:45 CET 2006
--12:10:45-- http://localhost:9080/ulisse/controluce
=> `controluce'
Resolving localhost... 127.0.0.1
Connecting to localhost|127.0.0.1|:9080... connected.
HTTP request sent, awaiting response...
HTTP/1.0 200 OK
Server: Zope/(Zope 2.8.6-final, python 2.4.2, linux2) ZServer/1.1 Plone/Unknown
Date: Fri, 10 Nov 2006 11:10:45 GMT
Content-Length: 16181
Content-Language: en
Expires: Fri, 10 Nov 2006 12:10:45 GMT
Last-Modified: Fri, 10 Nov 2006 11:10:45 GMT
Connection: Keep-Alive
Cache-Control: max-age=3600
Content-Type: text/html;charset=utf-8
Length: 16,181 (16K) [text/html]
Removing controluce.
2.2 The second requeste sent to the proxy
-------------------------------------------------
(NOTE: the result is cached)
Fri Nov 10 12:11:09 CET 2006
--12:11:09-- http://localhost:9999/controluce
=> `controluce'
Resolving localhost... 127.0.0.1
Connecting to localhost|127.0.0.1|:9999... connected.
HTTP request sent, awaiting response...
HTTP/1.1 200 OK
Date: Fri, 10 Nov 2006 11:11:09 GMT
Server: Apache/2.2.3 (Unix)
Last-Modified: Fri, 10 Nov 2006 11:07:39 GMT
Content-Length: 15703
Content-Language: en
Expires: Fri, 10 Nov 2006 12:07:39 GMT
Cache-Control: max-age=3600
Age: 211
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html;charset=utf-8
Length: 15,703 (15K) [text/html]
12:11:09 (499.18 MB/s) - `controluce' saved [15703/15703]
here is also my apache configuration:
---------------------------------------
CacheEnable disk /
CacheRoot /home/cristi/dev/apache-httpd-2.2.3/i1/var/zope
# CacheSize 10000
# CacheGcInterval 2
CacheLastModifiedFactor 0.1
CacheDefaultExpire 1
CacheDirLength 2
ExpiresActive On
ExpiresByType image/gif A10
ExpiresByType image/png A10
ExpiresByType image/jpeg A10
ExpiresByType text/css A10
ExpiresByType text/javascript A10
ExpiresByType application/x-javascript A10
ExpiresByType text/html A10
ExpiresByType text/xml A10
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