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OK = 0
GENERIC_ERROR = 31100000
UNEXPECTED_ERROR = 31100001
NETWORK_ERROR = 31100002
INVALID_REQUEST = 31100100
INVALID_RESOURCE = 31100101
HANDSHAKE_REFUSED = 31100200
UNSUPPORTED_VERSION = 31100201
UNSUPPORTED_ALGO = 31100202
UNSUPPORTED_PARAMS = 31100203
Used in: v2.HandshakeResponse
int32 error_code = 1
string error_msg = 2