RE: Caching configuration and News Site (cnn.com)
- From: J.Beunk@xxxxxxxxxxxxxxx
- To: isalist@xxxxxxxxxxxxx
- Date: Fri, 25 Apr 2003 12:56:39 -0600
Shawn,
Thanks, I can reproduce this at my home computer for the sites mentioned.
The site in which I'm interested in (www.eindhovensdagblad.nl) doesn't
give me anything back ! Any suggestions ?
Kind regards.
Jos Beunk
> Hi Jos,
>
> Here are answers for those 2 sites you mentioned (cnn.com, anp.com) and also
> msnbc.com.
>
> CNN.com Response Headers:
> HTTP/1.1 200 OK
> Via: 1.0 MYPROXY
> Expires: Fri, 25 Apr 2003 11:49:15 GMT
> Date: Fri, 25 Apr 2003 11:48:16 GMT
> Content-Type: text/html
> Server: Netscape-Enterprise/6.1 AOL
> Last-Modified: Fri, 25 Apr 2003 11:48:15 GMT
> Cache-Control: private,max-age=60
>
> Private in the cache-control header means that a public cache must not cache
> it and the max-age means that a private cache (like a browser's) must expire
> it after 60 seconds. The time difference between the Date and Expires
> headers reinforces that 60 second expiration. My guess is that other
> objects sent by CNN have similar cache directives.
>
>
> anp.com Response Headers:
> HTTP/1.1 200 OK
> Via: 1.0 MYPROXY
> Date: Fri, 25 Apr 2003 11:50:17 GMT
> Content-Type: text/html; charset=ISO-8859-1
> Server: Apache/2.0.44 (Unix) PHP/4.3.1
> Accept-Ranges: bytes
> X-Powered-By: PHP/4.3.1
>
> This is a cacheable response, however other objects and pages deeper in the
> site may have cache-control directives associated with them. I would be
> suspicious of this site without further investigation.
>
>
> Another site, msnbc.com (after following their redirects...):
> HTTP/1.1 200 OK
> Via: 1.0 MYPROXY
> Expires: Thu, 24 Apr 2003 23:59:51 GMT
> Date: Fri, 25 Apr 2003 11:59:50 GMT
> Content-Type: text/html
> Server: Microsoft-IIS/5.0
> P3P: CP="BUS CUR CONo FIN IVDo ONL OUR PHY SAMo TELo"
> Pragma: no-cache
> Cache-Control: private
> Accept-Ranges: none
>
> Similiar to CNN, public cache must not cache but a private cache can unless
> it knows about the Pragma header. If it understands the Pragma header then
> it won't cache because of the no-cache directive. The content is set to
> expire immediately upon loading (with an Expires header set to a date in the
> past) so a private cache will never return anything because its content will
> already be expired. I would guess that this is also the norm for the
> majority of the content on this site.
>
> Hope that helps!
>
> -Shawn
>
> -----
> Shawn R. Quillman
> Robert Bosch Corporation RBNA/CIT1.1
> 38000 Hills Tech Drive
> Farmington Hills, MI 48331
> (248) 553-1164 (P) (248) 848-2855 (F)
> shawn.quillman@xxxxxxxxxxxx
>
>
> -----Original Message-----
> From: J.Beunk@xxxxxxxxxxxxxxx [mailto:J.Beunk@xxxxxxxxxxxxxxx]
> Sent: Friday, April 25, 2003 4:53 AM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] Caching configuration and News Site (cnn.com)
>
>
> http://www.ISAserver.org
>
>
> Hello,
>
> Since a few months we've been using ISA server. One of my clients is
> dependant on information published on news sites like: cnn.com, anp.com
> etc. He came up with a question for which i can't provide the answer, so I
> share it with the group:)
> - Are Newssites like cnn.com, anp.com being cached ?
> - Does this mean that we don't see the last content of this site but only
> the content in the cache
> - What is the refresh frequency of the cache ?
>
> We use the following cache configuration:
> - Enabled HTTP Caching - Less frequently (Reduced network traffic is more
> important)
>
> I hope one of you has an answer tho these questions.
>
> Kind regards,
>
> Jos Beunk
>
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