[whatwg] Proposal: add attributes etags & last-modified to <link> element.

[Julian Reschke]

On 20.09.2010 02:37, Aryeh Gregor wrote:
> ...
> Sure it would.  You can currently only save an HTTP request if a
> future Expires header (or equivalent) can be sent.  A lot of the time,
> the resource might change at any moment, so you can't send such a
> header.  The client has to check every time, and get a 204, even if
> the resource changes very rarely.  If you could indicate in the HTML
> source that you know the resource hasn't changed, you could save a lot
> of round-trips on a page that links to many resources.
 > ...

Resources that should be cached (stylesheets, images) but change at 
unexpected times are indeed a problem.

A well understood approach is to push some kind of version indicator 
into the URI (such as query parameter).

Best regards, Julian