También puedes declarar el parámetro `Response` en dependencias y establecer headers (y cookies) en ellas.

## Retorna una `Response` directamente

También puedes agregar headers cuando devuelves un `Response` directamente.

Crea un response como se describe en [Retorna un Response Directamente](response-directly.md){.internal-link target=_blank} y pasa los headers como un parámetro adicional:

{* ../../docs_src/response_headers/tutorial001.py hl[10:12] *}

public class BoostDocPagerTest extends UnitFessTestCase {

    public void test_BoostDocPage() {
        BoostDocPager boostdocpager = new BoostDocPager();

        boostdocpager.clear();
        assertEquals(0, boostdocpager.getAllRecordCount());
        assertEquals(0, boostdocpager.getAllPageCount());
        assertEquals(false, boostdocpager.isExistPrePage());

public class CrawlingInfoPagerTest extends UnitFessTestCase {

    public void test_CrawlingInfoPage() {
        CrawlingInfoPager crawlinginfopage = new CrawlingInfoPager();

        crawlinginfopage.clear();
        assertEquals(0, crawlinginfopage.getAllRecordCount());
        assertEquals(0, crawlinginfopage.getAllPageCount());
        assertEquals(false, crawlinginfopage.isExistPrePage());

public class DuplicateHostPagerTest extends UnitFessTestCase {

    public void test_DuplicateHostPager() {
        DuplicateHostPager duplicatehostpager = new DuplicateHostPager();

        duplicatehostpager.clear();
        assertEquals(0, duplicatehostpager.getAllRecordCount());
        assertEquals(0, duplicatehostpager.getAllPageCount());
        assertEquals(false, duplicatehostpager.isExistPrePage());

        try {
            // Force release the handle with null checks
            if (this.usageCount != null) {
                this.usageCount.set(0);
            }

            // Clear references to prevent memory leaks
            try {
                if (this.treeConnection != null) {
                    // Release the tree connection if possible

        parent.putAll(m);
    }

    /**
     * Removes all of the mappings from this map.
     */
    @Override
    public void clear() {
        parent.clear();
    }

    /**
     * Returns a Set view of the keys contained in this map.
     *
     * @return a set view of the keys contained in this map
     */
    @Override

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

O **FastAPI** criará o objeto do tipo `BackgroundTasks` para você e o passará como esse parâmetro.

## Criar uma função de tarefa

Crie uma função a ser executada como tarefa em segundo plano.

É apenas uma função padrão que pode receber parâmetros.

    long total = 0;
    CharBuffer buf = createBuffer();
    while (from.read(buf) != -1) {
      Java8Compatibility.flip(buf);
      to.append(buf);
      total += buf.remaining();
      Java8Compatibility.clear(buf);
    }
    return total;
  }

  // TODO(lukes): consider allowing callers to pass in a buffer to use, some callers would be able

                ipAttempts.size());
    }

    /**
     * Reset all rate limiting state
     */
    public void reset() {
        accountAttempts.clear();
        ipAttempts.clear();
        globalAttemptsInCurrentWindow.set(0);
        currentWindowStart.set(System.currentTimeMillis());
        totalAttemptsBlocked.set(0);
        totalAccountsLocked.set(0);

  List<Multiset<Integer>> multisets = new ArrayList<>(0x10000);
  int[] queries = new int[ARRAY_SIZE];

  @BeforeExperiment
  void setUp() {
    Random random = new Random();
    multisets.clear();
    for (int i = 0; i < ARRAY_SIZE; i++) {
      HashMultiset<Integer> multiset = HashMultiset.<Integer>create();
      multisets.add(multiset);
      queries[i] = random.nextInt();
      multiset.add(queries[i]);
    }