# Constants
all of the following messages start with R (0x52) AuthenticationOk AuthenticationKerberosV5 AuthenticationCleartextPassword AuthenticationMD5Password AuthenticationSCMCredential AuthenticationGSS AuthenticationSSPI AuthenticationGSSContinue AuthenticationSASL AuthenticationSASLContinue AuthenticationSASLFinal NegotiateProtocolVersion.
https://www.postgresql.org/docs/current/protocol-flow.html the following three values are the only three valid responses from a server for the first byte.
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# Structs
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