Faye

Browser client

Extensions

Faye clients support an extension system that lets you intercept messages as they pass between the client and the server. To add an extension to a client, just call:

client.addExtension(extension);

extension should be an object with an incoming() or outgoing() method (or both). These methods accept a message and a callback function, and should call the callback with the message after any necessary modifications have been made. For example, a simple logging extension would look like:

Logger = {
  incoming: function(message, callback) {
    console.log('incoming', message);
    callback(message);
  },
  outgoing: function(message, callback) {
    console.log('outgoing', message);
    callback(message);
  }
};

client.addExtension(Logger);

For more information on writing extensions, see the Node server or Ruby server documentation.