*/
    public static final String ISO_DATETIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

    /**
     * The feature for secure processing in XML.
     */
    public static final String FEATURE_SECURE_PROCESSING = "http://javax.xml.XMLConstants/feature/secure-processing";

    /**
     * The feature for external general entities in XML.
     */

**Technology Stack:**
- Java 21+, Maven
- OpenSearch (provided dependency)
- Apache Lucene (query parsing, text analysis)
- ICU4J (Unicode text processing)
- JUnit 4 (testing)

**Repository:** https://github.com/codelibs/fess-suggest

---

## Architecture

### Package Structure

```
org.codelibs.fess.suggest/

                // Simulate an exception during processing
                if (is.available() > 0) {
                    throw new RuntimeException("Simulated processing error");
                }
            }
            fail("Should have thrown RuntimeException");
        } catch (RuntimeException e) {
            assertEquals("Simulated processing error", e.getMessage());

import jakarta.servlet.ServletResponse;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

/**
 * Servlet filter for processing web API requests.
 * This filter intercepts HTTP requests and delegates processing to appropriate web API managers.
 */
public class WebApiFilter implements Filter {

    /**
     * Default constructor.
     */
    public WebApiFilter() {

        }
        return Result.FAILED;
    }

    /**
     * Enumeration representing the possible results of thumbnail image processing.
     */
    protected enum Result {
        /** Thumbnail was successfully generated */
        OK,
        /** Thumbnail generation failed due to processing errors */
        FAILED,
        /** Image dimensions do not meet validation requirements */
        INVALID_SIZE,

 *   <li>Handling unsupported URLs</li>
 *   <li>Checking last modified dates</li>
 *   <li>Getting content</li>
 *   <li>Handling redirects</li>
 *   <li>Processing responses</li>
 *   <li>Handling exceptions during crawling and child URL processing</li>
 *   <li>Handling cases where no URL is in the queue</li>
 *   <li>Handling cases where no response processor or rule is found</li>
 *   <li>Handling system errors</li>
 * </ul>

import org.apache.logging.log4j.Logger;
import org.codelibs.core.lang.StringUtil;

/**
 * Utility class for text normalization and processing.
 *
 * This class provides methods to normalize text by reading characters from a provided Reader
 * and processing them according to specific rules. The main functionality is encapsulated
 * within the nested {@link TextNormalizeContext} class.
 *

                        logger.debug("CIFSException on SID processing.", e);
                    }
                }
            } catch (final Exception e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Exception on SID processing.", e);
                }
            }
        }
    }

    /**
     * Preprocesses the URI before processing the request.
     *

import jakarta.annotation.PostConstruct;

/**
 * Response processor implementation for the Fess search engine.
 * This processor extends DefaultResponseProcessor to provide additional
 * processing capabilities through the ingest framework, allowing for
 * custom data transformation and enrichment during the crawling process.
 *
 * <p>It supports pluggable ingesters that can modify the result data

            reload(updater);
        }
    }

    /**
     * Reloads the dictionary file with the specified updater.
     * @param updater the updater to use for processing items
     */
    protected void reload(final ProtwordsUpdater updater) {
        try (CurlResponse curlResponse = dictionaryManager.getContentResponse(this)) {