ISA caching with no cache-related info in response header

Posted by Mike M. Lin on Server Fault See other posts from Server Fault or by Mike M. Lin
Published on 2011-01-13T18:55:43Z Indexed on 2011/01/13 19:55 UTC
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cache

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isa

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http-headers

From the documentation, I can't figure out what criteria an ISA server uses to figure out if a cached file is valid when no cache-related info is in the response header. Let's say I got this header in my response on Thu, 13 Jan 2011 18:43:35 GMT:

HTTP/1.1 200 OK
Date: Thu, 13 Jan 2011 18:43:35 GMT
Server: Apache/2.2.3 (Red Hat)
Content-Language: en
X-Powered-By: Servlet/2.5 JSP/2.1
Keep-Alive: timeout=15
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=ISO-8859-1

There's no cache directive, no last-modified field, no expires field. How will the ISA server decide for how long to cache this response?

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