WebSub (FKA. PubSubHubbub)
Active Installs
100,000+
Last Updated
January 22, 2026
First Released
May 15, 2009
Download History (Last one month)
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
Default Hubs
By default this plugin will ping the following hubs:
Please contact us if you operate a hub that you would like to be included as a default option.
- Upload the
pubsubhubbubdirectory to your/wp-content/plugins/directory - Activate the plugin through the ‘Plugins’ menu in WordPress
- Select custom hubs under your WebSub/PubSubHubbub Settings (optional)
Screenshot Gallery
WebSub provides a common mechanism for communication between publishers of any kind of Web content and their subscribers, based on HTTP web hooks. Subscription requests are relayed through hubs, which validate and verify the request. Hubs then distribute new and updated content to subscribers when it becomes available. WebSub was previously known as PubSubHubbub.
A WebSub Hub is an implementation that handles subscription requests and distributes content to subscribers when the corresponding topic URL has been updated.
A WebSub Publisher is an implementation that advertises a topic and hub URL on one or more resource URLs. This plugin acts as a publisher for your WordPress site.
A WebSub Subscriber is an implementation that discovers the hub and topic URL given a resource URL, subscribes to updates at the hub, and accepts content distribution requests from the hub. This plugin provides a subscriber API for other plugins to use.
The Subscriber API allows other plugins to subscribe to WebSub-enabled feeds using WordPress hooks. See the Subscriber API documentation for detailed examples and usage.
For a complete list of available actions and filters, see the Hooks Wiki.
Changelog
Project maintained on GitHub at pubsubhubbub/wordpress-pubsubhubbub.
4.0.0
- Added WebSub Subscriber API with hooks for consumer plugins
- Deprecated all
pubsubhubbub_*hooks in favor ofwebsub_*prefix (old hooks still work) - Replaced Grunt and Docker with wp-env for local development
- Fixed double-escaping issues in feed discovery
- Improved WebSub spec compliance and PHP 8 compatibility
3.2.1
- fix: empty option on fresh install leads to broken feed links
3.2.0
- improved validating, sanitizing, and escaping
- simplified code
3.1.4
- add Content-Type header to WebSub requests
3.1.3
- update configuration files, fix typos, update dependencies
3.1.2
- add new WebSub Hub
3.1.1
- fix deprecation issue (PHP8)
- add
_deprecated_functionwarnings
3.1.0
- update wording (more consequent use of WebSub)
- add category-, tag- and author-feeds support
3.0.3
- update dependencies
3.0.2
- better
self-linkgenerator
3.0.1
- add donation button
3.0.0
- optimized the DB load
- added help section
- better code encapsulation
2.2.2
- temporarily remove comment-feed support to be more GDPR compliant
2.2.1
- display topic URLs on the settings page
2.2.0
- fixed a discovery bug
- changed http client
2.1.0
- save pinged URLs to add correct headers
2.0.0
- Complete rewrite
- Support WebSub
1.0.0
- First attempt
" width="120" height="120">
Available Versions
| Version | Download | Type |
|---|---|---|
| 4.0.0 | Download | Stable |
| 3.2.1 | Download | Stable |
| 3.2.0 | Download | Stable |
| 3.1.4 | Download | Stable |
| 3.1.3 | Download | Stable |
| 3.1.2 | Download | Stable |
| 3.1.1 | Download | Stable |
| 3.1.0 | Download | Stable |
| 3.0.3 | Download | Stable |
| 3.0.2 | Download | Stable |
| 3.0.1 | Download | Stable |
| 3.0.0 | Download | Stable |
| 2.2.2 | Download | Stable |
| 2.2.1 | Download | Stable |
| 2.2.0 | Download | Stable |
| 2.1.0 | Download | Stable |
| 2.0.1 | Download | Stable |
| 2.0.0 | Download | Stable |
| 1.7.2 | Download | Stable |
| 1.7.1 | Download | Stable |
| 1.7.0 | Download | Stable |
| 1.6.5 | Download | Stable |
| 1.6.4 | Download | Stable |
| 1.6.3 | Download | Stable |
| 1.6.2 | Download | Stable |
| 1.6.1 | Download | Stable |
| 1.6 | Download | Stable |
| 1.5 | Download | Stable |
| 1.4 | Download | Stable |
| 1.3 | Download | Stable |
| 1.2 | Download | Stable |
| 1.1 | Download | Stable |
| 1.0 | Download | Stable |
| Development | Download | Trunk |
