# Advanced Middleware { #advanced-middleware }

In the main tutorial you read how to add [Custom Middleware](../tutorial/middleware.md){.internal-link target=_blank} to your application.

And then you also read how to handle [CORS with the `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

In this section we'll see how to use other middlewares.

## Adding ASGI middlewares { #adding-asgi-middlewares }

    INSTANCE {
      @Override
      public long getLongLittleEndian(byte[] array, int offset) {
        return (long) HANDLE.get(array, offset);
      }

      @Override
      public void putLongLittleEndian(byte[] array, int offset, long value) {
        HANDLE.set(array, offset, value);
      }
    };

    @Override
    public boolean usesFastPath() {
      return true;
    }

# Security { #security }

There are many ways to handle security, authentication and authorization.

And it normally is a complex and "difficult" topic.

In many frameworks and systems just handling security and authentication takes a big amount of effort and code (in many cases it can be 50% or more of all the code written).

/**
 * SMB1 Find Close2 request message.
 *
 * This command is used to close a search handle that was
 * opened by a Trans2 Find First2 request.
 */
public class SmbComFindClose2 extends ServerMessageBlock {

    private final int sid;

    /**
     * Creates a new SMB1 find close request to close a search handle.
     *
     * @param config the CIFS configuration
     * @param sid the search identifier to close

     */
    boolean generate(String thumbnailId, File outputFile);

    /**
     * Checks if this generator can handle the given document.
     * @param docMap The document map containing metadata.
     * @return True if this generator can handle the document, false otherwise.
     */
    boolean isTarget(Map<String, Object> docMap);

    /**

			return FileInfoVersions{}, err
		}
		versions, err = xlMeta.ListVersions(volume, path, allParts)
	}
	if err == nil && len(versions) == 0 {
		// This special case is needed to handle len(xlMeta.versions) == 0
		versions = []FileInfo{
			{
				Volume:   volume,
				Name:     path,
				Deleted:  true,
				IsLatest: true,
				ModTime:  timeSentinel1970,
			},
		}
	}
	if err != nil {

        assertNotNull(request);
    }

    @Test
    @DisplayName("Constructor should handle null filename")
    void testConstructorWithNullFilename() {
        // When & Then
        assertDoesNotThrow(() -> new Trans2GetDfsReferral(mockConfig, null));
    }

    @Test
    @DisplayName("Constructor should handle empty filename")
    void testConstructorWithEmptyFilename() {
        // When & Then

        try {
            dataIndexHelper.crawl("test-session-force-stop");
            assertTrue("Should exit quickly when force stopped", true);
        } catch (Exception e) {
            assertTrue("Force stop should handle exceptions quickly", true);
        }
    }

    public void test_crawl_with_short_intervals() {
        try {
            // Test with minimal interval

                assertEquals(testByte, buffer[i], "Byte at position " + i + " was modified");
            }
        }

        @Test
        @DisplayName("Should handle encoding at buffer boundary")
        void testEncodeAtBufferBoundary() {
            // Given
            byte[] exactBuffer = new byte[EXPECTED_SIZE];
            SrvCopychunk chunk = new SrvCopychunk(999L, 888L, 777);

the License is distributed on an ## "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY ## KIND, either express or implied. See the License for the ## specific language governing permissions and limitations ## under the License. ## This software bundles the following NOTICE files from third party library providers: META-INF/NOTICE in archive lib/guice-5.1.0.jar Google Guice - Core Library Copyright 2006-2022 Google, Inc. This product includes software developed at The Apache Software Foundation ...