Sheesh, did you bother to read the linked document?
The "client" in pubsub registers a call-back URL with the server, and the server then POSTs new data to that URL.
No periodic polling required -- that's the whole point of this.
The "client" in pubsub registers a call-back URL with the server, and the server then POSTs new data to that URL.
No periodic polling required -- that's the whole point of this.