Pusher

Documentation

Getting started
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Using Pusher
Client API Overview
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Authenticating Users
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Reference
Authentication Signatures
Pusher JS changelog
Flash Fallback
Browser compatibility
REST API reference
Pusher WebSocket Protocol
Resources
Other resources on the web
From the blog
Channels vs Events
Showing who's online-(PHP)
Introducing private channels
Backbone.js, now realtime with Pusher

Flash fallback

WebSockets aren't available in all browsers yet, and for these laggards there is a Flash-based workaround.

Flash has had socket support for many years, and it is possible to emulate native WebSocket API proxying via a flash object. This support is provided by the excellent web-socket-js library.

The Pusher Javascript includes everything required for the Flash fallback to Just Work. The flash fallback JavaScript and accompanying swf file will be loaded asynchronously by pusher.js for browsers without native WebSockets.

In previous versions of the pusher.js file (below 1.5), you had to host the SWF file yourself. This is no longer necessary.