* </p>
 *
 * <p>
 * The handler relies on environment variables for configuration:
 * </p>
 * <ul>
 *   <li>{@code S3_ENDPOINT}: The endpoint URL of the S3 service.</li>
 *   <li>{@code S3_ACCESS_KEY}: The access key for authentication.</li>
 *   <li>{@code S3_SECRET_KEY}: The secret key for authentication.</li>
 *   <li>{@code S3_REGION}: The region of the S3 service (default: us-east-1).</li>
 * </ul>
 *
 * <p>

        if (StringUtil.isBlank(accessKey)) {
            throw new CrawlingAccessException(
                    "S3 access key is blank. Please set the S3_ACCESS_KEY environment variable or accessKey parameter.");
        }
        final String secretKey = getInitParameter("secretKey", null, String.class);
        if (StringUtil.isBlank(secretKey)) {