SSL_set_tlsext_status_type
if (SSL_set_tlsext_status_type(ctx->ssl_conn, TLSEXT_STATUSTYPE_ocsp) != 1) {
SSL_set_tlsext_status_type(ssl, TLSEXT_STATUSTYPE_ocsp);
SSL_set_tlsext_status_type(ssl, TLSEXT_STATUSTYPE_ocsp);
SSL_set_tlsext_status_type(con, TLSEXT_STATUSTYPE_ocsp);