SSLv23_client_method
const SSL_METHOD *SSLv23_client_method(void); /* SSLv3 or TLSv1.* */
if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) {
conn->ssl_meth = SSLv23_client_method();
meth = SSLv23_client_method();