Hi all,
Today I wrote up a first draft for a variation on PubSubHubbub for
JSON-based applications:
http://martin.atkins.me.uk/specs/pubsubhubbub-json
As noted in the specification document, the goal is to make the hub as
dumb as possible, having the payloads just be opaque JSON objects as far
as the hub is concerned. This means that this can be used for multiple
JSON-based applications without changing the hub.
The near-term goal is to allow the fledgling "Activity Streams API" spec
to use this as a transport, but I also want to make it useful for
delivering other content and for proprietary payloads like those used in
Facebook's real-time notifications API.
It'd be nice if this format could be supported alongside Atom and RSS in
the App Engine hub reference implementation, though I've not yet dug
deeply into the code to figure out how hard that might be.
