No changes since 2.2.0-rc3.
Changes since 2.1.6:
[NEW] XHR streaming and polling transports were extracted from SockJS
[NEW] Reduced the number of roundtrips required by HTTP streaming and polling transports for connecting from 3 to 1
[NEW] Refactored the connection strategy to be faster and more reliable for clients using HTTP
[NEW] HTTP streaming and polling are now supported on Opera
[NEW] Dependency loader will retry fetching additional resources if they fail to load
[NEW] Added third argument to the bind method on event emitters to allow binding of context to callbacks
[CHANGED] Reduced the size of sockjs.js
[CHANGED] Added extra 1s to the cached transport timeout
[CHANGED] Changed the primary WebSocket fallback to WSS instead of HTTP
[FIXED] Issue with SockJS streaming not being able to reconnect
[FIXED] MozWebSocket is not assigned to WebSocket anymore
[FIXED] Socket listeners are always unbound after closing the connection