*     must be at least 4
   * @param bufferSize the size of the internal buffer. Must be a multiple of chunkSize
   */
  protected AbstractStreamingHasher(int chunkSize, int bufferSize) {
    // TODO(kevinb): check more preconditions (as bufferSize >= chunkSize) if this is ever public
    checkArgument(bufferSize % chunkSize == 0);

    // TODO(user): benchmark performance difference with longer buffer

        assertNotNull(buffer2, "Reused buffer should not be null");
        assertEquals(SmbComTransaction.TRANSACTION_BUF_SIZE, buffer2.length, "Reused buffer should have correct size");

        // Note: We don't check if content is cleared as that's not a security requirement
        // The important part is that the buffer is valid and has correct size
    }

    /**
     * Test getBuffers method for transaction buffers.
     */

			if cr.debug {
				fmt.Printf("Unknown key %q - expected on of %v\n", key, cr.trailers)
			}
			return errMalformedEncoding
		}
		cr.trailers.Set(key, value)
		delete(wantTrailers, key)
	}

	// Check if we got all we want.
	if len(wantTrailers) > 0 {
		return io.ErrUnexpectedEOF
	}
	return nil

        isInit = true;
    }

    /**
     * Checks if a bucket exists in the object storage.
     * @param name the name of the bucket to check
     * @return true if the bucket exists, false otherwise
     * @throws CrawlingAccessException if an error occurs while checking bucket existence
     */
    protected boolean bucketExists(final String name) {

		vc, err = globalBucketVersioningSys.Get(bucket)
		if err != nil {
			return err
		}

		// Check if the current bucket has a configured lifecycle policy
		lc, err = globalLifecycleSys.Get(bucket)
		if err != nil && !errors.Is(err, BucketLifecycleNotFound{Bucket: bucket}) {
			return err
		}

		// Check if bucket is object locked.
		lr, err = globalBucketObjectLockSys.Get(bucket)
		if err != nil {
			return err

        assertNotNull(exception.getCause());
        assertEquals(middleCause, exception.getCause());
        assertEquals("Processing failed", exception.getCause().getMessage());

        // Check nested cause
        Throwable nestedCause = exception.getCause().getCause();
        assertNotNull(nestedCause);
        assertEquals(innerCause, nestedCause);

     */
    public int getFlags() {
        return this.flags;
    }

    /**
     * Checks if a specific compression algorithm is supported.
     *
     * @param algorithm the algorithm to check
     * @return true if the algorithm is supported
     */
    public boolean supportsAlgorithm(int algorithm) {
        if (this.compressionAlgorithms == null) {
            return false;
        }

## Parámetros opcionales

De la misma manera, puedes declarar parámetros de query opcionales, estableciendo su valor por defecto en `None`:

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

/// check | Revisa

Además, nota que **FastAPI** es lo suficientemente inteligente para notar que el parámetro de path `item_id` es un parámetro de path y `q` no lo es, por lo tanto, es un parámetro de query.

///

{* ../../docs_src/path_operation_configuration/tutorial005.py hl[21] *}

/// info | 정보

`response_description`은 구체적으로 응답을 지칭하며, `description`은 일반적인 *경로 작동*을 지칭합니다.

///

/// check | 확인

OpenAPI는 각 *경로 작동*이 응답에 관한 설명을 요구할 것을 명시합니다.

따라서, 응답에 관한 설명이 없을경우, **FastAPI**가 자동으로 "성공 응답" 중 하나를 생성합니다.

///

<img src="/img/tutorial/path-operation-configuration/image03.png">

## 단일 *경로 작동* 지원중단

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

Nesse caso, o parâmetro da função `q` será opcional, e `None` será o padrão.

/// check | Verificar

Você também pode notar que o **FastAPI** é esperto o suficiente para perceber que o parâmetro da rota `item_id` é um parâmetro da rota, e `q` não é, portanto, `q` é o parâmetro de consulta.

///