Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> writes:
> On 2021-Feb-03, Tom Lane wrote:
>> I have a vague recollection that JDBC users still like to use
>> protocol 2 for some reason --- is that out of date?
> [ yes, since 2016 ]
Then let's kill it dead, server and libpq both.
regards, tom lane