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AuthenticationCleartextPasswordProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationCleartextPassword (B) Direction Backend → frontend First wire field Byte1(… AuthenticationGSSProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationGSS (B) Direction Backend → frontend First wire field Byte1('R') Field ent… AuthenticationGSSContinueProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationGSSContinue (B) Direction Backend → frontend First wire field Byte1('R') F… AuthenticationKerberosV5Protocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationKerberosV5 (B) Direction Backend → frontend First wire field Byte1('R') Fi… AuthenticationMD5PasswordProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationMD5Password (B) Direction Backend → frontend First wire field Byte1('R') F… AuthenticationOkProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationOk (B) Direction Backend → frontend First wire field Byte1('R') Field entr… AuthenticationSASLProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationSASL (B) Direction Backend → frontend First wire field Byte1('R') Field en… AuthenticationSASLContinueProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationSASLContinue (B) Direction Backend → frontend First wire field Byte1('R') … AuthenticationSASLFinalProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationSASLFinal (B) Direction Backend → frontend First wire field Byte1('R') Fie… AuthenticationSCMCredentialProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationSCMCredential (B) Direction Backend → frontend First wire field Byte1('R')… AuthenticationSSPIProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an authentication request. Backend messages AuthenticationSSPI (B) Direction Backend → frontend First wire field Byte1('R') Field en… BackendKeyDataProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as cancellation key data. The frontend must save these values if it wishes to be able to issue CancelRequest messages later. Backend me… Begin (logical replication)Protocol MessagesWikiProtocol Messages · Logical replication formatsLogical replication Begin format. Identifies the message as a begin message. Logical replication formats Begin Layer Logical replication payload; distinct from the frontend/backend message … Begin Prepare (logical replication)Protocol MessagesWikiProtocol Messages · Logical replication formatsLogical replication Begin Prepare format. Identifies the message as the beginning of a prepared transaction message. Logical replication formats Begin Prepare Layer Logical replication payl… BindProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a Bind command. Frontend messages Bind (F) Direction Frontend → backend First wire field Byte1('B') Field entries 11 Documented flo… BindCompleteProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a Bind-complete indicator. Backend messages BindComplete (B) Direction Backend → frontend First wire field Byte1('2') Field entries … CancelRequestProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Length of message contents in bytes, including self. Frontend messages CancelRequest (F) Direction Frontend → backend First wire field Int32(16) Field entrie… CloseProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a Close command. Frontend messages Close (F) Direction Frontend → backend First wire field Byte1('C') Field entries 4 Documented fl… CloseCompleteProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a Close-complete indicator. Backend messages CloseComplete (B) Direction Backend → frontend First wire field Byte1('3') Field entrie… CommandCompleteProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a command-completed response. Backend messages CommandComplete (B) Direction Backend → frontend First wire field Byte1('C') Field en… Commit (logical replication)Protocol MessagesWikiProtocol Messages · Logical replication formatsLogical replication Commit format. Identifies the message as a commit message. Logical replication formats Commit Layer Logical replication payload; distinct from the frontend/backend messa… Commit Prepared (logical replication)Protocol MessagesWikiProtocol Messages · Logical replication formatsLogical replication Commit Prepared format. Identifies the message as the commit of a prepared transaction message. Logical replication formats Commit Prepared Layer Logical replication pay… CopyBothResponseProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a Start Copy Both response. This message is used only for Streaming Replication. Backend messages CopyBothResponse (B) Direction Bac… CopyDataProtocol MessagesWikiProtocol Messages · Bidirectional messagesis a bidirectional protocol message. Identifies the message as COPY data. Bidirectional messages CopyData (F & B) Direction Frontend ↔ backend First wire field Byte1('d') Field entries 3 Do… CopyDoneProtocol MessagesWikiProtocol Messages · Bidirectional messagesis a bidirectional protocol message. Identifies the message as a COPY -complete indicator. Bidirectional messages CopyDone (F & B) Direction Frontend ↔ backend First wire field Byte1('c') F… CopyFailProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a COPY -failure indicator. Frontend messages CopyFail (F) Direction Frontend → backend First wire field Byte1('f') Field entries 3 … CopyInResponseProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a Start Copy In response. The frontend must now send copy-in data (if not prepared to do so, send a CopyFail message). Backend messa… CopyOutResponseProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a Start Copy Out response. This message will be followed by copy-out data. Backend messages CopyOutResponse (B) Direction Backend → … DataRowProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a data row. Backend messages DataRow (B) Direction Backend → frontend First wire field Byte1('D') Field entries 5 Documented flow co… Delete (logical replication)Protocol MessagesWikiProtocol Messages · Logical replication formatsLogical replication Delete format. Identifies the message as a delete message. Logical replication formats Delete Layer Logical replication payload; distinct from the frontend/backend messa… DescribeProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a Describe command. Frontend messages Describe (F) Direction Frontend → backend First wire field Byte1('D') Field entries 4 Documen… EmptyQueryResponseProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a response to an empty query string. (This substitutes for CommandComplete.) Backend messages EmptyQueryResponse (B) Direction Backe… ErrorResponseProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as an error. Backend messages ErrorResponse (B) Direction Backend → frontend First wire field Byte1('E') Field entries 4 Documented flo… ExecuteProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as an Execute command. Frontend messages Execute (F) Direction Frontend → backend First wire field Byte1('E') Field entries 4 Document… FlushProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a Flush command. Frontend messages Flush (F) Direction Frontend → backend First wire field Byte1('H') Field entries 2 Documented fl… FunctionCallProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a function call. Frontend messages FunctionCall (F) Direction Frontend → backend First wire field Byte1('F') Field entries 9 Docume… FunctionCallResponseProtocol MessagesWikiProtocol Messages · Backend messagesis a backend protocol message. Identifies the message as a function call result. Backend messages FunctionCallResponse (B) Direction Backend → frontend First wire field Byte1('V') Field ent… GSSENCRequestProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Length of message contents in bytes, including self. Frontend messages GSSENCRequest (F) Direction Frontend → backend First wire field Int32(8) Field entries… GSSResponseProtocol MessagesWikiProtocol Messages · Frontend messagesis a frontend protocol message. Identifies the message as a GSSAPI or SSPI response. Note that this is also used for SASL and password response messages. The exact message type can be deduce… Insert (logical replication)Protocol MessagesWikiProtocol Messages · Logical replication formatsLogical replication Insert format. Identifies the message as an insert message. Logical replication formats Insert Layer Logical replication payload; distinct from the frontend/backend mess…