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From "Axel-Stephane SMORGRAV" <Axel-Stephane.SMORG...@europe.adp.com>
Subject RE: [users@httpd] mod_disk_cache
Date Wed, 09 Jan 2008 07:45:26 GMT
Lance,

I was surprised that you reported that the Cache: max-age=0 forced a revalidation of the resource
with the origin server. There is a BR in Bugzilla for this (actually there are several) for
which I provided a patch against 2.0.59:

http://issues.apache.org/bugzilla/show_bug.cgi?id=19441

>From memory there is at least one other RFC2616 compliance issue regarding the no-cache
request directive.

The bottom line is that if you want to use mod_cache with 2.0 you are on your own. If you
can you should migrate to 2.2.4 or 2.2.8 whenever it is released. If have run mod_cache 2.2.4
against a test suite of my own, and it passed all the tests that failed with 2.0.

-ascs
 
-----Message d'origine-----
De : Campbell, Lance [mailto:lance@uiuc.edu] 
Envoyé : mardi 8 janvier 2008 19:32
À : users@httpd.apache.org
Cc : jslive@gmail.com
Objet : RE: [users@httpd] mod_disk_cache

Joshua,
I thought this was working but it is not.  This is my sinario:

1) I have a Java servlet that serves up some content.  I put a display in the code so I can
confirm when it gets called.  I also put some code in the servlet to display header parameters
that it receives.

2) I clear my disk cache for apache.

3) I restart apache.

4) I hit the servlet through a browser.  The log file shows that it was hit.  I also notice
that there is files in the apache disk cache.

5) I then hit the servlet again through a browser.  Nothing comes through the log file.  So
the servlet never received the request but the page came up.  So apache is caching the file.

6) I now trigger another servlet that sends the same URL that I put manually into the browser.
 This request has the parameter
"Cache-Control: max-age=0" added to the header.  The servlet I have been talking to shows
that it receives a request.  The header shows the following name value pairs:

header name=Cache-Control
header value=max-age=0
header name=pragma
header value=no-cache
header name=user-agent
header value=Java/1.6.0_02
header name=host
header value=qa.webtools.uiuc.edu
header name=accept
header value=text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2 header name=connection header
value=keep-alive header name=content-length header value=0

When I go to the original servlet again I find the content is still the cached content.  It
is as though the disk cache module let my request go on through but it did not delete/refresh
the data.

What should I do?

Lance Campbell
Project Manager/Software Architect
Web Services at Public Affairs
University of Illinois
217.333.0382
http://webservices.uiuc.edu
 
-----Original Message-----
From: jslive@gmail.com [mailto:jslive@gmail.com] On Behalf Of Joshua Slive
Sent: Monday, January 07, 2008 11:27 AM
To: users@httpd.apache.org
Subject: Re: [users@httpd] mod_disk_cache

On Jan 7, 2008 12:12 PM, Campbell, Lance <lance@uiuc.edu> wrote:
> Joshua,
> I don't understand what you are saying.  Is there some command
parameter
> you can send to htcacheclean or is there a special way of formatting
the
> requested cached URL that will cause it to be refreshed?

Just make an HTTP request to the server for the targeted URL with a
"Cache-Control: max-age=0" header.

Joshua.

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