NOTE: Written by Phil Thompson
Postgres uses a message-based protocol for communication between frontends and backends. The protocol is implemented over TCP/IP and also on Unix sockets. Postgres v6.3 introduced version numbers into the protocol. This was done in such a way as to still allow connections from earlier versions of frontends, but this document does not cover the protocol used by those earlier versions.
This document describes the initial version-numbered protocol, designated v1.0. Higher level features built on this protocol (for example, how libpq passes certain environment variables after the connection is established) are covered elsewhere.
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