if (isValidProxyConfig(proxyHost, proxyPort)) {
      setProxy(proxyHost, proxyPort);
      String user = Optional.ofNullable((String) configs.get(SchemaRegistryClientConfig.PROXY_USER)).orElse("");
      String password = Optional.ofNullable((String) configs.get(SchemaRegistryClientConfig.PROXY_PASSWORD)).orElse("");
      PasswordAuthentication passwordAuthentication = new PasswordAuthentication(user, password.toCharArray());
      String hostLowercase = proxyHost.toLowerCase();
      Authenticator.setDefault(new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication() {
          if (getRequestorType() == RequestorType.PROXY) {
            if (hostLowercase.equals(getRequestingHost().toLowerCase())) {
              if (proxyPort == getRequestingPort()) {
                return passwordAuthentication;
              }
            }
          }
          return null;
        }
      });
    }