Syntax: ssl_ecdh_curve curve; Default: ssl_ecdh_curve auto; Context: stream, server
Specifies a curve for ECDHE ciphers.
When using OpenSSL 1.0.2 or higher, it is possible to specify multiple curves (1.11.0), for example:
ssl_ecdh_curve prime256v1:secp384r1;
The special value auto (1.11.0) instructs nginx to use a list built into the OpenSSL library when using OpenSSL 1.0.2 or higher, or prime256v1 with older versions.
Prior to version 1.11.0, the prime256v1 curve was used