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"Extension X" is a MsgPack extension type (up to 128 extension types are allowed).

Message format

All messages, request and response, except handshake, start with unsigned integer message length (excluding the length itself).

• Any MsgPack unsigned integer type can be used, so that shorter messages use smaller type to encode length. Empty message will be single 0 byte.
• Maximum message length is 2147483647 (Integer.MAX_VALUE and maximum byte array length in Java)

Handshake

TODO: Magic word, features as map 

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