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Re: cached resources

From: Paul Pazandak <pazandak@OBJS.com>
Date: Fri, 23 Jan 1998 16:49:13 -0600
Message-ID: <34C91E6A.2CEE2204@OBJS.com>
To: Jigsaw Email List <www-jigsaw@w3.org>


Paul Pazandak wrote:

> Paul Pazandak wrote:
>
> > Yves Lafon wrote:
> >
> > > On Thu, 22 Jan 1998, Gil Hansen wrote:
> > >
> > > > How can one tell if a resource being downloaded is obtained from the cache
> > > > or from the remote host?
> > >
> > > If Jigsaw give the resource from the cache, the ingoingFilter of
> > > CacheFilter will return a Reply, you can use that.
> > > Another thing is to detect the Age: 0, but clearly, it is a hack :)
> > >
> >
> > According to the docs ingoingFilter procesing should stop if a non-null Replyis
> > returned. Shouldn't this mean that no other ingoingFilters are called when the
> > CacheFilter returns a non-null Reply? In our test cases, the ingoingFilters are
> >
> > still being called.
>
> Some additional info: In the http-server.props the line
> w3c.www.protocol.http.filterslists CacheFilter first. The code in HttpManager DOES
> appear correct however, and
> SHOULD stop processing other filters if the CacheFilter (or any filters) returns a
> non-null
> response.
>
> This would imply that the CacheFilter is the last filter being processed. ...I'll
> have to check
> this out.Sorry... I'm still in a daze from a nasty flu. Yes, one should be able to
> change theorder of filters in the http-server.props file, as long as jigsaw
> doesn't crash if the
> CacheFilter doesn't have to be listed first. (will it break jigsaw?)
>

As it turns out the filtering is working fine! The problem was our assumptions ofhow
the cache works (and, in turn, how HTTP works). E.g., a colleague noticed
that after first loading a page composed of several gifs, etc. a reload doesn't
appear
to take as long. This gave us the impression that the cache was being used. Could
you explain what happens when a reload occurs? What happens when the server
returns a "304 NOT MODIFIED"?.

Regards,

Paul.


> >
> > > ...
> >
> > >      /\          - Yves Lafon - World Wide Web Consortium -
> > >   /\ /  \                Architecture Domain - Jigsaw
> > >  /  \    \/\
> > > /    \   /  \   http://www.w3.org/People/Lafon - ylafon@w3.org
> >
>

   --

********************************************************************
Paul Pazandak                                      pazandak@objs.com
Object Services and Consulting, Inc.             http://www.objs.com
Minneapolis, Minnesota 55420-5409                       612-881-6498
********************************************************************
Received on Friday, 23 January 1998 17:46:29 GMT

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