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`--tlsv1.3`

docs/cmdline-opts/tlsv1.3.md

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--tlsv1.3

Force curl to use TLS version 1.3 or later when connecting to a remote TLS server.

If the connection is done without TLS, this option has no effect. This includes QUIC-using (HTTP/3) transfers.

Note that TLS 1.3 is not supported by all TLS backends.