SslMode
How much protection the connection demands of its transport, in PostgreSQL's own vocabulary.
The modes form a ladder, and the rung that matters is between REQUIRE and VERIFY_CA: everything below VERIFY_CA encrypts the connection without establishing who is on the other end of it, which an intermediary can satisfy with a certificate of its own. ChannelBinding is what closes that gap without a certificate chain to check against.
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As VERIFY_CA, and additionally require the certificate to name the host being connected to.