All, I hope you're all doing fine! For months we've heard about big susbcribers that one of the big "risks" with pubsubhubub is that it failed silently. If (for any reason) the hub forgets about a subscription (or even disappears), the subscribers will not know before expiration of the subscription (which could happen in days or weeks!).
Today, on the superfeedr hosted hubs (or the default hub), we allow people to subscribe with an extra flag : "superfeedr.digest=true", which will guarantee them that we'll send at least 1 notification daily. It serves 2 purposes : - heartbeat : this way the susbcriber can know that his subsription is still valid (and taken into account) - digest : we send the last few entries sent to the subscriber, so they can compare with what they received and make sure nothing was missed on their end. This doesn't belong to the "core" protocol and not all hubs will implement it (it involves storage of the feeds, which can be very costly), but this could be an extension to it. If somebody wants to work with us on this, feel free to reach out! More : http://blog.superfeedr.com/digest/heartbeat/pubsub/pubsubhubbub/digest-and-heartbeat-notification/ I'd love to have the opinion of the subscribers here (and even of the other hubs providers)... I know that Mario from Friendfeed requested this feature for long! Julien
