https://www.postgresql.org/docs/devel/static/sasl-authentication.html
contains that SCRAM is described in RFC 7677 and RFC 5741, but the
latter appears to be a mistake. Perhaps RFC 5802 was meant?
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Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services