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Re: IE6 and Cache-Control headers

From: Anews <anzenews@volja.net>
Date: Tue, 6 Jan 2004 12:49:33 +0100
To: Mark Nottingham <mnot@mnot.net>
Cc: www-talk@w3.org
Message-Id: <20040106114938.WOZR27443.kudu@there>


First of all, thank you all for the answers!

Maybe I wasn't exact with the question... Of course the browsers are not 
required to cache pages (user can always turn caching off), but I'm looking 
for the headers that would make most of my visitors' browsers to cache my 

Since then I played around with headers and discovered that IE6 does cache 
(and ask with If-Modified-Since) if you set Last-Modified and DON'T set 
Expires, no-cache and max-age (none of them must be set). You can however set 

The big question is: why? Am I misreading rfc2616? These headers shouldn't 
make a difference (at least not for the worse).

Why do I care? Because if I set headers so that IE6 works then Opera 6.12 for 
Linux stops working ('works' meaning that it does cache and yet still ask 
every time for new version of the page - at least if page is older than 100 
seconds). From what I read in rfc2616 both of the browsers are, well, weird. 
Or (more likely) I am missing something...

Any suggestions on a set of headers that would make most of the browsers to 
cache yet always ask for new versions of the pages would be nice... I want to 
make use of cache and yet I don't want the user to worry if the page he is 
visiting is really fresh...



On Monday 05 January 2004 17:33, Mark Nottingham wrote:
> Cache implementations are not *required* to cache things when they're
> cacheable; they're only required to not cache them when they're
> uncacheable. Some browser cache implementations (not just IE) are quite
> simplistic and/or conservative, so they may not cache a lot of things
> that other caches will.
> Cheers,
> On Jan 4, 2004, at 7:44 AM, Anews wrote:
> > Now: other browsers (Opera, Konqueror and Mozilla for Linux) obey and
> > check
> > the server for newer versions, yet they allow me to issue 304 response
> > - the
> > way it should be. But IE6 just doesn't cache the response. The weird
> > thing is
> > that it works as expected on my production server (over LAN), but not
> > over
> > Internet.
> >
> > Am I missing something? I tried "Cache-Control: private" too, but to no
> > avail...
Received on Tuesday, 6 January 2004 06:49:50 UTC

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