if c.config.MaxVersion != 0 && c.config.MaxVersion <= VersionTLS12 {
			return nil, nil, nil, errors.New("tls: MaxVersion must be >= VersionTLS13 if EncryptedClientHelloConfigList is populated")
		}
		echConfigs, err := parseECHConfigList(c.config.EncryptedClientHelloConfigList)
		if err != nil {
			return nil, nil, nil, err
		}
		echConfig := pickECHConfig(echConfigs)
		if echConfig == nil {