https://indieweb.org/WebSub
WebSub - IndieWeb
WebSub is an open standard (W3C Recommendation) notification-based protocol for web publishing and subscribing to streams and legacy feed files in real time,...
websubindieweb
https://pe.wordpress.org/plugins/pubsubhubbub/advanced/
WebSub (FKA. PubSubHubbub) (advanced view) – WordPress plugin | WordPress.org Perú
A WebSub plugin for WordPress that enables real-time publishing and subscription capabilities.
advanced viewwordpress pluginwebsubfkapubsubhubbub