NegotiateProtocolVersion
NegotiateProtocolVersion is a backend protocol message. Identifies the message as a protocol version negotiation message.
Reading PG 18·Select a recorded version
- Direction
- Backend → frontend
- First wire field
- Byte1('v')
- Field entries
- 5
- Documented flow contexts
- Start-up
- direction
- B
- manual path
- /docs/18/protocol-message-formats.html
- signature
- NegotiateProtocolVersion (B)
Definition PG 18
-
- Byte1('v')
-
Identifies the message as a protocol version negotiation message.
- Int32
-
Length of message contents in bytes, including self.
- Int32
-
Newest minor protocol version supported by the server for the major protocol version requested by the client.
- Int32
-
Number of protocol options not recognized by the server.
Then, for protocol option not recognized by the server, there is the following:
- String
-
The option name.
Wire fields in documented order
| Position | Format | Meaning |
|---|---|---|
| 1 | Byte1('v') | Identifies the message as a protocol version negotiation message. |
| 2 | Int32 | Length of message contents in bytes, including self. |
| 3 | Int32 | Newest minor protocol version supported by the server for the major protocol version requested by the client. |
| 4 | Int32 | Number of protocol options not recognized by the server. |
| 5 | String | The option name. |
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Complete source facts
fields
map[description:Identifies the message as a protocol version negotiation message. format:Byte1('v')], map[description:Length of message contents in bytes, including self. format:Int32], map[description:Newest minor protocol version supported by the server for the major protocol version requested by the client. format:Int32], map[description:Number of protocol options not recognized by the server. format:Int32], map[description:The option name. format:String]Source references
Full definition and evidence JSON
Definition sources
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
Text language: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f