default is a list of ciphersuites this library uses by default.

supported is a list of ciphersuites this library supports (larger than default).

fs is a list of ciphersuites which provide forward secrecy (sublist of default).

http2 is a list of ciphersuites which are allowed to be used with HTTP2: not a member of bad cipher suites. These are only ephemeral key exchanges with AEAD ciphers.

fs_of ciphers selects all ciphersuites which provide forward secrecy from ciphers.