Es gibt viele Situationen, in denen Sie einem Client, der Ihre API benutzt, einen Fehler zurückgeben müssen.

Dieser Client könnte ein Browser mit einem Frontend, Code von jemand anderem, ein <abbr title="Internet of Things – Internet der Dinge: Geräte, die über das Internet Informationen austauschen">IoT</abbr>-Gerät, usw., sein.

Sie müssten beispielsweise einem Client sagen:

* Dass er nicht die notwendigen Berechtigungen hat, eine Aktion auszuführen.

import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;

/**
 * Abstract base class for handling CORS (Cross-Origin Resource Sharing) requests.
 * Provides common CORS header constants and defines the processing interface.
 */
public abstract class CorsHandler {

    /**
     * Creates a new instance of CorsHandler.
     */
    public CorsHandler() {
        // Default constructor
    }

    /**

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.entity;

import java.util.Map;

/**
 * Interface for search log events in the Fess search system.
 *
 * This interface defines the contract for search log event objects that can be
 * written to log files or stored in the search index. Implementations include
 * search logs, click logs, favorite logs, and user information logs.
 */

import static org.junit.jupiter.api.Assertions.assertTrue;

import org.junit.jupiter.api.Test;
import org.mockito.Mockito;

/**
 * Tests for {@link SmbFilenameFilter}. Since the interface only defines
 * a single method, the tests simply ensure that the lambda expression
 * correctly implements the method and that any exception is propagated.
 */
class SmbFilenameFilterTest {

    @Test

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 */
package jcifs.internal.fscc;

import jcifs.Decodable;
import jcifs.Encodable;

/**
 * Base interface for File System Control Code (FSCC) file information structures.
 * Defines common functionality for various SMB2/SMB3 file information classes used in
 * query and set file information operations, with constants for information levels.
 *
 * @author mbechler
 */

If you don't care about any of these terms and you just need to add security with authentication based on username and password *right now*, skip to the next chapters.

## OAuth2 { #oauth2 }

OAuth2 is a specification that defines several ways to handle authentication and authorization.

It is quite an extensive specification and covers several complex use cases.

It includes ways to authenticate using a "third party".

     * Specifies how many results to display if redirection fails.
     */
    public String num;

    /**
     * Sort parameter for error page fallback.
     * Defines the sorting order if redirection fails.
     */
    public String sort;

    /**
     * Language parameter for error page fallback.
     * Specifies the language preference if redirection fails.
     */

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs.pac;

/**
 * Constants for PAC (Privilege Attribute Certificate) data structures.
 * Defines buffer types and other constants used in PAC parsing and validation.
 */
public interface PacConstants {

    /**
     * PAC structure version number.
     */
    int PAC_VERSION = 0;

    /**

import org.apache.maven.api.annotations.Immutable;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;

/**
 * Base interface for service requests in Maven. This interface defines the common contract
 * for all request types within the Maven service layer, providing access to session context
 * and request tracing capabilities.
 *