WebSub (FKA. PubSubHubbub)

This plugin implements the WebSub protocol (formerly known as PubSubHubbub) for WordPress. It enables real-time notifications when your blog is updated and provides a subscriber API for other plugins to consume WebSub-enabled feeds.

Publisher Features

When you publish or update a post, this plugin automatically notifies WebSub hubs, which then distribute the update to all subscribers in real-time.

• Sends realtime notifications when you update your blog
• Supports multi-user installations (WordPress MU)
• Supports multiple hubs
• Supports all feed formats used by WordPress (Atom, RSS2, RDF)
• Adds <link rel="hub"> and <link rel="self"> declarations to feeds and HTML

Subscriber Features

The plugin provides a subscriber API that allows other plugins (like feed readers) to subscribe to WebSub-enabled feeds using WordPress hooks.

• REST API callback endpoint for subscription verification and content delivery
• Hub discovery from topic URLs (HTTP Link headers and feed content)
• HMAC signature verification (SHA1, SHA256, SHA384, SHA512)
• Full lifecycle hooks for integration with other plugins

Supported Specifications

• WebSub W3C Recommendation
• PubSubHubbub 0.4

Default Hubs

By default this plugin will ping the following hubs:

• Demo hub on Google App Engine
• SuperFeedr
• WebSubHub

Please contact us if you operate a hub that you would like to be included as a default option.