Has anyone use PubSubHubbub ( http://en.wikipedia.org/wiki/PubSubHubbub ) for this pattern in the past? For straight subscriptions, it's always been compelling to think of the use cases being covered by PSHB and RSS.
So, PubSubHubbub is not linked with RSS anymore and works with any type of data format, including JSON obviously :)
The quick win of PubSubHubbub compared to Resthook is that it has a 'security' mechanism in it, which means that the subscriber can be 100% sure that the service sending the notification is not someone impersonating it.
Aside from this, I feel like PubSubHubbub and Reshook solve the same problem: programatically setting up webhooks.
