Add support for postgresql protocol #77
Merged
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With postgresql to initiate SSL-encrypted connection specific combination
of bytes must be sent to the server.
Message flow is described on following page
https://www.postgresql.org/docs/13/protocol-flow.html#id-1.10.5.7.11
And SSLRequest message format is described on
https://www.postgresql.org/docs/13/protocol-message-formats.html
The value of SSLRequest message becomes to bytes that is used in the code