Re: Cacheing based on MIME Types (this time in plain text)
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Sat, 20 Sep 2003 13:10:02 -0500
Hey guys,
That is to say, you can configure the Web server to set the header
information to "expire immediately"
HTH,
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: Friday, September 19, 2003 2:17 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Cacheing based on MIME Types (this time in plain
text)
http://www.ISAserver.org
You have to remember; what's dynamically-generated at the web server
appears
to be static content to the recipient.
This is the limit to the ISA interpretation of "dynamic".
Cache control is as specified by the web server or intermediate proxies.
While you may not have control over the web app, it sounds as if you do
have
control over the web server.
It's here that you can exercise those controls for anyone.
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://www.microsoft.com/isaserver
http://isaserver.org/Jim_Harrison
http://isatools.org
Read the help, books and articles!
----- Original Message -----
From: "Scott Shields" <sshields@xxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Friday, September 19, 2003 11:34
Subject: [isalist] Cacheing based on MIME Types (this time in plain
text)
http://www.ISAserver.org
Can anyone add insight to the following discussion?
Initial Question:
Can ISA control cache contents based on MIME Type?
My Response:
Can you elaborate a bit more on exactly what you trying to accomplish?
Reply from sender:
"many of our applications do not pass application session parameters via
the URI, but utilize a more-secure method of storing these parameters
within the app server persistent store. in those instances, i cannot be
ensured that the URI will contain a '?', and thus i cannot be ensured
that ISA will not attempt to cache dynamically-generated HTTP responses.
(ISA's mgmt app appears to define active/non-cachable content solely
based upon the presence/absence of a question-mark within the URI..)
anyway - given that many of our apps are externally-developed and/or
COTS, i cannot rely upon our application suite to have properly
incorporated the standard 'no-cache' entries within HTTP response
headers. and therein lies my biggest issue with ISA - i seem to be
lacking the ability to manage the cache engine such that i can have it
NOT cache dynamic content that odes not include the proper HTTP header
directives and which does not utilize the URI to pass app parameters.
i have found technical references that speak to allowing/disallowing
caching based upon wite site (FQDN) - what i need is something more
granular, e.g.
the ability to define '.jsp' as a noncachable doc type, or to conversely
define only PNG, JPG, and GIF as cachable MIME types (in which case all
other content would be treated as dynamic and therefore not cached).
does this make sense?"
Scott Shields | Technical Account Advisor | M (972) 849-7493 | O (972)
963-1498 | sshields@xxxxxxxxxxxxx
Microsoft
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