/**
     * Creates a new S3StorageClient instance.
     *
     * @param endpoint the S3 endpoint URL (null for AWS default)
     * @param accessKey the AWS access key
     * @param secretKey the AWS secret key
     * @param bucket the bucket name
     * @param region the AWS region
     */
    public S3StorageClient(final String endpoint, final String accessKey, final String secretKey, final String bucket,

        // Utility class
    }

    /**
     * Auto-detect storage type from endpoint URL.
     *
     * @param endpoint the storage endpoint URL
     * @return detected storage type
     */
    public static StorageType detectStorageType(final String endpoint) {
        if (StringUtil.isBlank(endpoint)) {
            // Default to S3 if no endpoint (uses AWS default)
            return StorageType.S3;
        }

    nextInBucketKToV = createFilledWithAbsent(expectedSize);
    nextInBucketVToK = createFilledWithAbsent(expectedSize);

    firstInInsertionOrder = ENDPOINT;
    lastInInsertionOrder = ENDPOINT;

    prevInInsertionOrder = createFilledWithAbsent(expectedSize);
    nextInInsertionOrder = createFilledWithAbsent(expectedSize);
  }

        // In this test, we expect IOException when endpoint is blank
        try {
            conn.connect();
            fail("Should throw IOException when endpoint is not set");
        } catch (IOException e) {
            assertTrue(e.getMessage().contains("endpoint is blank"));
        }
    }

    /**
     * Test thread-safety of connect() method.

        final String endpoint = getInitParameter("endpoint", null, String.class);
        if (StringUtil.isNotBlank(endpoint)) {
            // For fake-gcs-server or custom endpoint
            builder.setHost(endpoint);
            builder.setCredentials(NoCredentials.getInstance());
            if (logger.isDebugEnabled()) {
                logger.debug("Using custom GCS endpoint: {}", endpoint);
            }

        }

        if (StringUtil.isNotBlank(endpoint)) {
            // For fake-gcs-server or custom endpoint
            builder.setHost(endpoint);
            builder.setCredentials(NoCredentials.getInstance());
            if (logger.isDebugEnabled()) {
                logger.debug("Using custom GCS endpoint: {}", endpoint);
            }
        } else {

            return;
        }

        super.init();

        final String endpoint = getInitParameter("endpoint", null, String.class);
        if (StringUtil.isBlank(endpoint)) {
            throw new CrawlingAccessException(
                    "S3 endpoint is blank. Please set the S3_ENDPOINT environment variable or endpoint parameter.");
        }

            try {
                final StorageOptions.Builder builder = StorageOptions.newBuilder().setProjectId(projectId);

                if (StringUtil.isNotBlank(endpoint)) {
                    // For fake-gcs-server or custom endpoint
                    builder.setHost(endpoint);
                    builder.setCredentials(NoCredentials.getInstance());
                } else if (StringUtil.isNotBlank(credentialsFile)) {

        String bucketName = "fess";
        Integer mappedPort = minioServer.getFirstMappedPort();
        Testcontainers.exposeHostPorts(mappedPort);
        String endpoint = String.format("http://%s:%s", minioServer.getContainerIpAddress(), mappedPort);
        logger.info("endpoint: {}", endpoint);

        StandardCrawlerContainer container = new StandardCrawlerContainer().singleton("mimeTypeHelper", MimeTypeHelperImpl.class)//

                return;
            }
            final String endpoint = System.getenv().get("S3_ENDPOINT");
            final String accessKey = System.getenv().get("S3_ACCESS_KEY");
            final String secretKey = System.getenv().get("S3_SECRET_KEY");
            final String region = System.getenv().getOrDefault("S3_REGION", "us-east-1");

            // Validate endpoint before attempting connection