code: public static boolean isSslKeyManagerEnabled(HttpClientConfig config) {
      return StringUtils.isNotEmpty(config.getSslContextType())
          && StringUtils.isNotEmpty(config.getKeyManagerType())
          && StringUtils.isNotEmpty(config.getKeyStoreType())
          && StringUtils.isNotEmpty(config.getKeyStorePath());
    }
docs: Checks whether a SSL key store is configured.
  @param config Http client configuration
  @return true if client certificates are enabled