Brett Lindsley wrote:
Andy, I recall bringing up the same issue with respect to portable devices. My angle
was that firing up the transmitter, making a network connection and connecting to
the server is still an expensive operation in time and power (for a portable
device) - even if the server returns nothing . There is no reason to check feeds
that are not being updated, but then, there currently is no way to know this.
I recall there was a proposal on cache control. That seemed like a good direction,
but I don't recall it being discussed. As you indicated, if the feed had some
element that indicated it won't be updated (for example) for another day (e.g.
a "daily news summary"), then the end client would need to only check once
a day.
Brett Lindsley, Motorola Labs
Isn't this what the HTTP "Expires" header is for (<http://greenbytes.de/tech/webdav/rfc2616.html#header.expires>)?
Best regards, Julian
