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Response
int	Type = 0
int	Request id
int	Flags (1 = partition assignment changed)
long	Observable timestamp (causality token)
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)

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Response
bool	whether a tuple with the given key exists

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Request
bool	Read-only tx flag
long	Observable timestamp (value from server - see standard response header)