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Commit85d799b

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docs: Update phrase on message lengths in the protocol
The reasoning for why all the message formats are parseable withoutthe explicit message length field is anachronistic; the real reason isthat protocol version 2 did not have a message length field. There'snothing wrong with relying on the message length, like we do in theCopyData messags, even though it often still makes sense to havelength fields for individual parts in messages.Discussion:https://www.postgresql.org/message-id/02a4eed2-98f0-4796-9d4f-12128ff44fe0@iki.fi
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‎doc/src/sgml/protocol.sgml

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@@ -3624,10 +3624,10 @@ psql "dbname=postgres replication=database" -c "IDENTIFY_SYSTEM;"
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indicate that it can be sent by a frontend (F), a backend (B), or both
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(F & B).
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Notice that although each message includes a byte count at the beginning,
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the message format is defined so that the message end can be found without
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reference to the byte count. Thisaids validity checking. (The CopyData
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message is an exception, because it forms part of a data stream; the contents
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of any individual CopyData message cannot be interpretable on their own.)
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most messages are defined so that the message end can be found without
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reference to the byte count. Thisis for historical reasons, as the
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original, now-obsolete protocol version 2 did not have an explicit length
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field. It also aids validity checking though.
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</para>
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<variablelist>

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