Tim Bray launched a version of something called PubSubHubub launched Sunday. "Parties (servers) speaking the PubSubHubbub protocol can get near-instant notifications (via webhook callbacks) when a topic (feed URL) they're interested in is updated. He's not totally convinced. "I just don't see how, absent heroics like Skype has to use, POST-to-the-client is going to deal with the reality of ubiquitous firewalls."
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