}

    /**
     * Checks if HTTP sessions are enabled.
     *
     * @return true if sessions are used, false otherwise
     */
    public boolean isUseSession() {
        return useSession;
    }

    /**
     * Sets whether to use HTTP sessions.
     *
     * @param useSession true to enable sessions, false to disable
     */

labels.user_name=Nombre de usuario
labels.login=Iniciar sesión
labels.login.placeholder_username=Nombre de usuario
labels.login.placeholder_password=Contraseña
labels.login.title=Iniciar sesión
labels.index_label=Etiqueta
labels.index_lang=Idioma preferido
labels.index_sort=Ordenar
labels.index_num=Número de resultados
labels.logout_title=Cerrar sesión
labels.logout=Cerrar sesión
labels.do_you_want_to_logout=¿Desea cerrar la sesión?

 * <p>
 * This class now uses the standard {@link java.util.Base64} implementation
 * instead of a custom implementation, providing better security and performance.
 * The API remains backward compatible with previous versions.
 * </p>
 *
 * @author higa
 */
public abstract class Base64Util {

    /**
     * Do not instantiate.
     */
    protected Base64Util() {
    }

    /**
     * Encodes data in Base64.

     */
    @Override
    public void delete(final String sessionId) {
        dataHelper.deleteAccessResultMap(sessionId);
    }

    /**
     * Deletes all access results from all sessions.
     */
    @Override
    public void deleteAll() {
        dataHelper.clearUrlQueueList();
    }

    /**
     * Gets an access result for the specified session and URL.
     *

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.core.sync.RequestBody;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.S3ClientBuilder;
import software.amazon.awssdk.services.s3.model.CommonPrefix;

        }

        return bestDelimiter;
    }

    /**
     * Counts occurrences of a character in a string, excluding quoted sections.
     *
     * @param line the line to analyze
     * @param ch the character to count
     * @return the number of occurrences
     */
    protected int countOccurrences(final String line, final char ch) {

### Core Principles

**Thread Safety**:
- `AtomicLong` for counters (`CrawlerContext.accessCount`)
- `volatile` for status flags
- Synchronized blocks for critical sections
- Thread-local storage via `CrawlingParameterUtil`

**Resource Management**:
- `AutoCloseable` throughout
- `DeferredFileOutputStream` for large responses (temp files for >1MB)
- Connection pooling with limits

import org.codelibs.core.lang.StringUtil;

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectRequest;
import software.amazon.awssdk.services.s3.model.HeadObjectRequest;

     * <li>Applies document boosting and metadata enhancements</li>
     * <li>Sends processed documents to the search engine</li>
     * <li>Cleans up processed data and manages crawler sessions</li>
     * </ul>
     *
     * <p>The method includes error handling, retry logic, and will terminate
     * if too many empty results are encountered or if a system shutdown is requested.
     */
    @Override

/**
 * Helper class for controlling crawler execution intervals and timing.
 * This class manages crawler execution timing based on configurable rules
 * that can specify different delays for different time periods and days.
 */
public class IntervalControlHelper {

    /** Flag indicating whether the crawler is currently running */
    protected volatile boolean crawlerRunning = true;

    /**
     * Default constructor.