WebSub replaces costly periodic RSS polling with an event-driven publish/subscribe model that notifies subscribers within 50 milliseconds of article publication.
1. WebSub Tripartite Architecture
- Publisher: Declares
<link rel="hub" href="...">and<link rel="self" href="...">in its XML feed and pings the hub upon new post creation. - Hub: A high-throughput server that verifies subscriber intents (HMAC-SHA256 handshake) and fans out push notifications.
- Subscriber: Receives raw XML/JSON payloads directly over authenticated HTTP POST webhooks.