where is Socket.io 0.9.x document?

Because Some socket.io related client library are still support 0.9.x. (eg: Object-c library, Java library )

So I need to read document about 0.9.x, so I try to visit

• http://socket.io/#how-to-use
• https://github.com/LearnBoost/socket.io
• https://github.com/LearnBoost/socket.io/wiki/Exposed-events

This above link is about 1.x version. and the github wiki is not work.