Examples of Push APIs

Question

Looking for examples of Push APIs, other than the websocket or the comet or the pubsub. Need examples specifically for communication between two systems (versus Client/Browser - Server). In other words it doesn't have to be over HTTP.

Answer 1

PubSubHubbub A simple, open, server-to-server web-hook-based pubsub (publish/subscribe) protocol as an extension to Atom and RSS.

They also have a wiki page for comparing different protocols.

Answer 2

There are several somewhat evolved APIs for this. Here is one for jQuery. Here is a blog post describing how to implement this in ASP.NET. It's a difficult framework to idea due to that pesky constant connectivity thing.