Response
4 bytes	Magic number 49 47 4E 49, or "IGNI". Helps to identify misconfigured SSL or different server on the port.
int	Payload length
int	Server version major
int	Server version minor
int	Server version patch
int	Error code (0 for success)
string	Error message (when error code is not 0)
int	When error code is 0: Server idle timeout
string	When error code is 0: Server node id
string	When error code is 0: Server node name (consistent id)
bin	When error code is 0: Server features (bitmask)
map (string → any)	When error code is 0: Extensions (auth, attributes, etc). Client can skip unknown extension data (when server is newer).

Basic request

Response
int	Transaction ID

Request
int	Transaction ID

Basic response

Request
int	Transaction ID

Basic response

Risks and Assumptions

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