handling in WebSockets is significantly improved.
 *  Fix: Don't use SPDY/3 style header concatenation for HTTP/2 request headers.
    This could have corrupted requests where multiple headers had the same name,
    as in cookies.
 *  Fix: Reject bad characters in the URL hostname. Previously characters like
    `\0` would cause a late crash when building the request.

- **I/O Operations** (`org.codelibs.core.io`) - File handling, resource management, stream utilities, and traversal utilities for efficient resource processing
- **Reflection** (`org.codelibs.core.lang`) - Class loading, method/field access, type introspection utilities, and generics support
- **Exception Handling** (`org.codelibs.core.exception`) - Runtime exception wrappers for common checked exceptions with consistent error handling

### Modern Java 21 Support

 * href="https://github.com/ReactiveX/RxJava/wiki">RxJava</a> (supplemented with its <a
 * href="https://github.com/ReactiveX/RxAndroid">RxAndroid</a> extension if you are building for
 * Android) or <a href="https://projectreactor.io/">Project Reactor</a>. (For the basics of
 * translating code from using an event bus to using a reactive-streams framework, see these two

   * Sec-Token-Binding}</a> header field name.
   *
   * @since 25.1
   */
  public static final String SEC_TOKEN_BINDING = "Sec-Token-Binding";

  /**
   * The HTTP <a href="https://datatracker.ietf.org/doc/html/draft-ietf-tokbind-ttrp">{@code
   * Sec-Provided-Token-Binding-ID}</a> header field name.
   *
   * @since 25.1
   */

import org.codelibs.fess.util.ComponentUtil;

/**
 * Interface for transforming and processing crawled documents in Fess.
 * Provides utility methods for URL processing, site extraction, data mapping,
 * and field configuration handling during the document transformation process.
 */
public interface FessTransformer {

    /**
     * Synchronized LRU cache for storing parent URL encodings.

    @Resource
    protected ActivityHelper activityHelper;

    /** Manager for handling HTTP response operations. */
    @Resource
    protected ResponseManager responseManager;

    /** Time manager for handling date and time operations. */
    @Resource
    protected TimeManager timeManager;

    /** System helper for various system-level operations. */
    @Resource

   * Test EqualsTester with no equals or not equals objects. This checks proper handling of null,
   * incompatible class and reflexive tests
   */
  public void testTestEqualsEmptyLists() {
    equalsTester.addEqualityGroup(reference);
    equalsTester.testEquals();
  }

  /**
   * Test EqualsTester after populating equalObjects. This checks proper handling of equality and
   * verifies hashCode for valid objects
   */

        try {
            dataIndexHelper.crawl("");
            dataIndexHelper.crawl(null);
            assertTrue("Empty session handling should be fast", true);
        } catch (Exception e) {
            assertTrue("Exception handling should be fast", true);
        }
    }

    public void test_component_integration() {
        // Test that all mock components are properly registered

    /** The time manager for handling time-related operations. */
    @Resource
    private TimeManager timeManager;

    /** The async manager for handling asynchronous operations. */
    @Resource
    private AsyncManager asyncManager;

    /** The session manager for handling user sessions. */
    @Resource
    private SessionManager sessionManager;

        assertNotNull(result);
        assertTrue(result instanceof TestUser);
        assertEquals("TestUser", ((TestUser) result).name);
    }

    // Test evaluate method with error handling
    public void test_evaluate_withErrorTemplate() {
        scriptEngine = new ErrorHandlingScriptEngine();
        String template = "error";
        Map<String, Object> paramMap = new HashMap<>();