Squashed commit of the following:

wu_xinjun

2022-03-15 4033aede52133f254f320838d2339ca3bfcb77e9

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2
HAND_SHAKE_MAGIC = b"\x01\x09\x08\x09\x01\x00\x02\x02" 
HEADER_MAGIC = b"\x02\x01\x04\x03\x06\x05\x08\x07"