- From: Julian Reschke <julian.reschke@gmx.de>
- Date: Tue, 10 Feb 2009 19:08:34 +0100
- To: Eric Lawrence <ericlaw@exchange.microsoft.com>
- CC: Anne van Kesteren <annevk@opera.com>, HTTP Working Group <ietf-http-wg@w3.org>
Eric Lawrence wrote: >> IE has lots of issues with Vary > > To be more specific, the WinINET networking stack does not cache outbound request headers, preventing IE and other applications from reusing resources that Vary without validation (except in narrow cases). See http://www.fiddler2.com/fiddler/Perf/AboutVary.asp for more information. > > Revalidation ensures cache-correctness but entails a performance cost. > > -Eric As far as I recall it also means that you can't pass content with Vary: to an external application, such as an *ics file (IE invokes the application with a filename of a temp file that does not exist). This is as of IE6, maybe it has been fixed since. BR, Julian
Received on Tuesday, 10 February 2009 18:09:23 UTC