Bruce Momjian <pgman@candle.pha.pa.us> writes:
> However, this brings up the issue of how a backend will fail if the
> client provides a newer protocol version. I think we should get it to
> send back its current protocol version and see if the client responds
> with a protocol version we can accept.
Why? A client that wants to do this can retry with a lower version
number upon seeing the "unsupported protocol version" failure. There's
no need to change the postmaster code --- indeed, doing so would negate
the main value of such a feature, namely being able to talk to *old*
postmasters.
regards, tom lane