Vary: ETag - RSS
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Copyright 2003-4 Randy Charles Morin
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Sun, 12 Sep 2004 20:14:09 GMT
Vary: ETag

Sam Ruby: The core idea is that, sites that are willing to trade a little CPU for a bandwidth savings, subsetting the feed that is returned on a GET based on the ETag that was provided on the request may make sense. 

Randy: Some more intelligentsia on "The Web doesn't scale blog thread."

Update: As Sam suggests, this protocol is complex. Let me add too complex. I have to wonder why you don't just make the lastModDate the ETag and return only results whose lastModDate is more current than the If-None-Match header? Seems to be some detail in the Vary: ETag that offers little gain. Again, I wouldn't implement this unless I had a really active and popular feed. Just wondering.

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