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Frontend/Backend Protocol

The Frontend/Backend Protocol is a message-based protocol for communication between PostgreSQL frontends and backends.

Change history

• PostgreSQL 14
  • support for protocol version 2 removed (commit 3174d69f)
• PostgreSQL 10
  • support for protocol version 1 removed (commit 2f1eaf87)
• PostgreSQL 7.4
  • protocol version 3 introduced (preliminary commit fe19e56c)
• PostgreSQL 7.3
  • support for version 0 of the Frontend/Backend_Protocol removed (commit 5241a625))
• PostgreSQL 6.4
  • protocol version 2 introduced (suspected preliminary commit edbd5139)
• PostgreSQL 6.3
  • version numbers introduced (commit d5bbe2ac)

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