[whatwg] Proposal: add attributes etags & last-modified to <link> element.
julian.reschke at gmx.de
Sun Sep 19 23:25:09 PDT 2010
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
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