WebSub (FKA. PubSubHubbub)

The WebSub formerly known as PubSubHubbub plugin is a powerful tool designed to notify subscribers in realtime when a blog is updated.

This plugin is widely used by services such as Google Alerts due to its efficient and reliable performance.

It operates by relaying subscription requests through hubs, which validate and verify the request.

These hubs then distribute new and updated content to subscribers as soon as it becomes available.

By default, this plugin will ping certain hubs, but it can be customized to include other hubs as per the users preference.

This plugin is tagged under indieweb, ping, pubsub, webhook, and websub.