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curl/docs/cmdline-opts/curves.d

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+Long: curves
+Arg: <algorithm list>
+Help: (EC) TLS key exchange algorithm(s) to request
+Protocols: TLS
+Added: 7.73.0
+Category: tls
+---
+Tells curl to request specific curves to use during SSL session establishment
+according to RFC 8422, 5.1.  Multiple algorithms can be provided by separating
+them with ":" (e.g.  "X25519:P-521").  The parameter is available identically
+in the "openssl s_client/s_server" utilities.
+
+--curves allows a OpenSSL powered curl to make SSL-connections with exactly
+the (EC) curve requested by the client, avoiding intransparent client/server
+negotiations.
+
+If this option is set, the default curves list built into openssl will be
+ignored.