Fiddler Web Debugger - Fiddler Header Reference

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Key References

HEADER NAME	HEADER SIGNIFICANCE
Expires	Date the response expires and should no longer be used by a cache. See http://www.mnot.net/cache_docs/ or pg 183. Note that this header should be overruled by the Cache-Control header in a HTTP1.1 client.
Cache-Control: must-revalidate	Note that the O'Reilly book (and many other places, including IE) implement this incorrectly! See http://www.mnot.net/cache_docs/ or RFC2616.
P3P	Compact P3P Privacy statement. See http://www.p3pwriter.com/LRN_111.asp for a description of the token meanings. See also Info on IE6's Privacy features and impact on HTTP Cookies.
Set-Cookie	Info on IE's Privacy features and impact on HTTP Cookies