CAREFUL: When utilizing two-way communication, it is important to ensure that the remote handler is not blocked on a send.
If the remote handler is blocked on a send, and the client is trying to send without the remote receiving,
the operation would become deadlocked if the channels are full.

### Typed handlers

Typed handlers are handlers that have a specific type for the request and response payloads.

```go
    // Create a typed handler.

import org.lastaflute.web.servlet.request.stream.WrittenStreamOut;

/**
 * Abstract base class for dictionary files that manage dictionary items.
 * A dictionary file represents a collection of dictionary items with
 * CRUD operations and pagination support.
 *
 * @param <T> the type of dictionary items managed by this file
 */
public abstract class DictionaryFile<T extends DictionaryItem> {
    /** The dictionary manager responsible for this file. */

 * This class provides methods to construct search queries from various parameters,
 * handle special characters, and format the final query string for search operations.
 */
public class QueryStringBuilder {

    private static final String OR_ALT = " || ";

    private static final String OR = " OR ";

    private static final String SPACE = " ";

            // The important part is that the storage is marked as destroyed
        }

        assertTrue(storage.isDestroyed(), "Storage should be marked as destroyed");

        // Operations should fail after destroy
        assertThrows(IllegalStateException.class, () -> {
            storage.encryptCredentials(plaintext);
        }, "Should throw IllegalStateException after destroy");

        new LinkedBlockingDeque<Object>(),
        new LinkedBlockingDeque<Object>(10),
        new PriorityBlockingQueue<Object>(10, Ordering.arbitrary()));
  }

  /*
   * We need to perform operations in a thread pool, even for simple cases, because the queue might
   * be a SynchronousQueue.
   */
  private ExecutorService threadPool;

  @Override
  public void setUp() {
    threadPool = newCachedThreadPool();

         * @param reader The reader.
         */
        public TextNormalizeContext(final Reader reader) {
            this.reader = reader;
        }

        /**
         * Executes the text processing operation on the provided reader.
         *
         * This method reads characters from the reader and processes them according to the following rules:
         * - ISO control characters and space characters are treated as spaces.

             * necessarily populated with header data because they're not writing
             * the header, only their body. But for whatever reason one might wish
             * to populate fields if the writeXxx operation needs this header data
             * for whatever reason. I copy over the uid here so it appears correct
             * in logging output. Logging of andx segments of messages inadvertantly

        // Unicode flag is passed explicitly, so it should be set
        assertTrue((unicodeType1.getFlags() & NtlmFlags.NTLMSSP_NEGOTIATE_UNICODE) != 0);
        // Default is OEM, so both flags are set due to OR operation
        assertTrue((unicodeType1.getFlags() & NtlmFlags.NTLMSSP_NEGOTIATE_OEM) != 0);

        // OEM flag is default when isUseUnicode() is false

		}
	}

	return nil
}

// repair will copy all seemingly valid data entries from a corrupted set.
// This does not ensure that data is correct, but will allow all operations to complete.
func (x *xlMetaInlineData) repair() {
	data := *x
	if len(data) == 0 {
		return
	}

	if !data.versionOK() {
		*x = nil
		return
	}

	canonicalHeaders := canonicalizedAmzHeadersV2(headers)
	if len(canonicalHeaders) > 0 {
		canonicalHeaders += "\n"
	}

	date := expires // Date is set to expires date for presign operations.
	if date == "" {
		// If expires date is empty then request header Date is used.
		date = headers.Get(xhttp.Date)
	}

	// From the Amazon docs:
	//
	// StringToSign = HTTP-Verb + "\n" +