Re: protocol version negotiation (Re: [HACKERS] Libpq PGRES_COPY_BOTH- version compatibility)

On 29 June 2017 at 12:23, Craig Ringer <craig@2ndquadrant.com> wrote:

> It does. But I don't see anywhere that extra round trips have been discussed.

Ah, right, they're implied by having the server respond with some
downversion message and ignore input until the client sends a new
startup message. That'll only happen when a too-new client connects to
an older server, but that's probably not an especially unusual case.

-- Craig Ringer                   http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services