- From: Williams, Stuart <skw@hplb.hpl.hp.com>
- Date: Tue, 19 Mar 2002 19:51:47 -0000
- To: "'Elliotte Rusty Harold'" <elharo@metalab.unc.edu>
- Cc: www-tag@w3.org
Interesting questions... With respect to caching infrastructure and representations retrived from cache then I think there's something of a trade-off between degree of global consistency, latency and scalability. What I think you get is a representation of the resource you asked for, although it my be a little stale, and your 'view' of that resource might not be entirely consistent with the view that you see from elsewhere (or at a different time). Need to think more about the other case with delayed DNS updates. Stuart > -----Original Message----- > From: Elliotte Rusty Harold [mailto:elharo@metalab.unc.edu] > Sent: 19 March 2002 17:25 > To: www-tag@w3.org > Subject: Space Varying URIs in Summary: Section 2: What does a URI > identify? > > > I notice that this draft makes explicit the idea that a resource is > time-varying because wat's at the end of the URI. > > Are resources also space-varying? Consider the impact of proxy > servers (especially infrequently updated ones like AOL's), local > caches, and even DNS servers that don't always agree with each other. > You may not get the same resource I get when resolving the URI > http://www.cafeconleche.org/ even if we resolve it at the same moment > in time. You may have an older copy in your cache. My DNS may deliver > a different mirror site that hasn't been updated yet, etc. > > Does this need to be discussed? Either to confirm it as proper > behavior or to deprecate it as indicative of broken software and > systems? > -- > > +-----------------------+------------------------+-------------------+ > | Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer | > +-----------------------+------------------------+-------------------+ > | The XML Bible, 2nd Edition (Hungry Minds, 2001) | > | http://www.cafeconleche.org/books/bible2/ | > | http://www.amazon.com/exec/obidos/ISBN=0764547607/cafeaulaitA/ | > +----------------------------------+---------------------------------+ > | Read Cafe au Lait for Java News: http://www.cafeaulait.org/ | > | Read Cafe con Leche for XML News: http://www.cafeconleche.org/ | > +----------------------------------+---------------------------------+ >
Received on Tuesday, 19 March 2002 14:52:17 UTC