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Request
int	Operation code
int	Request id, generated by client and returned as-is in response
...	Operation-specific data

0 for success error code is not 0

Response
int	Type = 0
int	Request id
uuid or null	Trace id (null for success)
int	Error code (	when trace id is not null)
string	Error message (when	trace id is not null)
string or null	Error stack trace (when trace id is not null)
map or null	Error details (when trace id is not null)
...	Operation-specific data (when trace id is null)

Request or response without operation-specific data is called basic request or basic response below.

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