Re: Media types and rss (was Re: Using dc:language vs language)

On 6/12/07, Charles Iliya Krempeaux <[email protected]> wrote:
>
> Hey Lucas,
>
> On 6/12/07, Lucas Gonze <[email protected]> wrote:
> >
> > On 6/11/07, Charles Iliya Krempeaux <[email protected]> wrote:
> > > Consider a video that is made of up 2 video clips.
> >
> > Another way of tackling this --
> >
> > Both A and B are media HTTP links encountered by an RSS user agent
> > with good support for HTTP caching. When the RSS user agent initially
> > encounters these links it fetches them. A has a cache expiration date
> > far in the future. B has an cache expiration date. When the user
> > agent is requested by the user to render them, it checks the
> > expiration and finds that A can be served from cache but B has to be
> > re-requested.
>
> I agree that HTTP provides some useful semantics through the HTTP
> "Cache-Control" header (as well as with the ETag and Last-Modifed
> mechanisms... with the conditional GETs)... however, it would be nice
> to get rid of that initial download, if possible, IMO.
>
> [snip]
>
> If we wanted to stick to HTTP... which would be a good thing IMO...
> then what I think we'd need is a (new) "conditional GET" where we can
> say something like...
>
> Return the contents of this "resource" only if I can cache it for
> "X" amount of time.
>
> Where "X" would be a very large number.

If I understand your use-case correctly, you don't need a new
conditional request header. The User Agent should send a HEAD request.
This will provide the Cache-Control and other response headers
discussed without the body - so will have a very small bandwidth
footprint.

http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.4

Regards,
Alan Dean
http://thoughtpad.net/alan-dean
http://simplewebservices.org


 
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