can socket io spec. has a extensible point?

[vongosling]

Using socket io spec. when handshaking I hope see the result such as
83cf8a5-b754-4247-a3fc-1422f7db3cbe:60:60:websocket,flashsocket,xhr-polling

:10.19.200.245:6060:0Lc2XWJzjqrsy/RGsQHGu/gZpKH/4TsWVKb8X0dPYKgXK6p6v14FsptUkuN4jv8s5BCgT6fZax3Y6b00uc2vr1pZiWU1AaCEdjNayR6xHaw=

note the second line may be a appendix for socket io spec. if in this case ,how can I handle?modify the sever handling logic is not a rational method obvious