byte[] storedFileId = (byte[]) fileIdField.get(request);
        assertArrayEquals(testFileId, storedFileId);
    }

    @Test
    @DisplayName("Constructor with null file ID should accept null")
    void testConstructorWithNullFileId() {
        // Should not throw exception
        Smb2FlushRequest requestWithNull = new Smb2FlushRequest(mockConfig, null);
        assertNotNull(requestWithNull);
    }

        // When pointer is 0, the string should be null
        PacUnicodeString unicodeString = new PacUnicodeString((short) 0, (short) 0, 0);

        // check() expects null when pointer is 0 but doesn't accept empty string
        assertThrows(PACDecodingException.class, () -> {
            unicodeString.check("");
        });

        // The implementation has a bug - it doesn't handle null properly

              parameterTypes.length);

          checkArgument(
              !parameterTypes[0].isPrimitive(),
              "@Subscribe method %s's parameter is %s. "
                  + "Subscriber methods cannot accept primitives. "
                  + "Consider changing the parameter to %s.",
              method,
              parameterTypes[0].getName(),
              Primitives.wrap(parameterTypes[0]).getSimpleName());

            if (commandLineArgsMatcher.find() && pidMatcher.find()) {
                String pid = pidMatcher.group(1);
                if (!MY_PID.equals(pid)) {
                    action.accept(pid, line);
                }
            }
        });
    }

    private static List<String> ps() {
        return run(determinePsCommand()).assertZeroExit().stdout.lines().collect(Collectors.toList());

* Daten verarbeiten:
    * Angenommen, Sie erhalten eine Datei, die einen langsamen Prozess durchlaufen muss. Sie können als Response „Accepted“ (HTTP 202) zurückgeben und die Datei im Hintergrund verarbeiten.

## `BackgroundTasks` verwenden { #using-backgroundtasks }

        return createPathMatcher(baseDirectory, includes, null, false);
    }

    /**
     * Returns a filter for directories that may contain paths accepted by the given matcher.
     * The given path matcher should be an instance created by this service.
     * The path matcher returned by this method expects directory paths.

# 后台任务

你可以定义在返回响应后运行的后台任务。

这对需要在请求之后执行的操作很有用，但客户端不必在接收响应之前等待操作完成。

包括这些例子：

* 执行操作后发送的电子邮件通知：
    * 由于连接到电子邮件服务器并发送电子邮件往往很“慢”（几秒钟），您可以立即返回响应并在后台发送电子邮件通知。
* 处理数据：
    * 例如，假设您收到的文件必须经过一个缓慢的过程，您可以返回一个"Accepted"(HTTP 202)响应并在后台处理它。

## 使用 `BackgroundTasks`

首先导入 `BackgroundTasks` 并在 *路径操作函数* 中使用类型声明 `BackgroundTasks` 定义一个参数：

{* ../../docs_src/background_tasks/tutorial001.py hl[1, 13] *}

	Expires            = "Expires"
	ContentLength      = "Content-Length"
	ContentLanguage    = "Content-Language"
	ContentRange       = "Content-Range"
	Connection         = "Connection"
	AcceptRanges       = "Accept-Ranges"
	AmzBucketRegion    = "X-Amz-Bucket-Region"
	ServerInfo         = "Server"
	RetryAfter         = "Retry-After"
	Location           = "Location"
	CacheControl       = "Cache-Control"

* Procesamiento de datos:
  * Por ejemplo, supongamos que recibes un archivo que debe pasar por un proceso lento, puedes devolver un response de "Accepted" (HTTP 202) y procesar el archivo en segundo plano.

## Usando `BackgroundTasks` { #using-backgroundtasks }

 * @author Craig Berry
 */
@GwtCompatible
@NullUnmarked
public class AsciiTest extends TestCase {

  /**
   * The Unicode points {@code 00c1} and {@code 00e1} are the upper- and lowercase forms of
   * A-with-acute-accent, {@code Á} and {@code á}.
   */
  private static final String IGNORED = "`10-=~!@#$%^&*()_+[]\\{}|;':\",./<>?'\u00c1\u00e1\n";

  private static final String LOWER = "abcdefghijklmnopqrstuvwxyz";