* Это будет сделано отправкой POST-запроса (из *вашего API*) в *внешний API*, предоставленный этим внешним разработчиком (это и есть «callback»).

## Обычное приложение **FastAPI** { #the-normal-fastapi-app }

Сначала посмотрим, как будет выглядеть обычное приложение API до добавления обратного вызова.

Por exemplo, dentro de uma função de *operação de rota* `assíncrona`, você pode obter o conteúdo com:

```Python
contents = await myfile.read()
```

Se você estiver dentro de uma função de *operação de rota* normal `def`, você pode acessar o `UploadFile.file` diretamente, por exemplo:

```Python
contents = myfile.file.read()
```

/// note | Detalhes Técnicos do `async`

 * {@code com.google.common.util.concurrent}) in degenerate class loaders which make certain
 * platform classes unavailable. Then we construct a test suite so we can run the normal FuturesTest
 * test methods in these degenerate classloaders.
 */

@NullUnmarked
@GwtIncompatible
@J2ktIncompatible
public class AggregateFutureStateFallbackAtomicHelperTest extends TestCase {

  /**

 * Iterator#remove} operations. This utility takes the brute-force approach of trying <i>all</i>
 * possible sequences of these operations, up to a given number of steps. So, if the caller
 * specifies to use <i>n</i> steps, a total of <i>3^n</i> tests are actually performed.
 *
 * <p>For instance, if <i>steps</i> is 5, one example sequence that will be tested is:
 *
 * <ol>
 *   <li>remove();
 *   <li>hasNext()
 *   <li>hasNext();

        assertTrue(resultString.contains("entriesReturned=2"), "toString should contain the number of entries.");
        assertTrue(resultString.contains("totalAvailableEntries=5"), "toString should contain the total available entries.");
    }

    /**
     * Tests the empty write methods to ensure they do nothing and return 0.
     */
    @Test
    void testWriteMethods() {

### Requests simples { #simple-requests }

Cualquier request con un header `Origin`. En este caso, el middleware pasará el request a través de lo normal, pero incluirá los headers CORS adecuados en el response.

## Más info { #more-info }

```

## Aynı Bağımlılığı Birden Fazla Kez Kullanma { #using-the-same-dependency-multiple-times }

Bağımlılıklarınızdan biri aynı *path operation* için birden fazla kez tanımlanırsa (örneğin birden fazla bağımlılığın ortak bir alt bağımlılığı varsa), **FastAPI** o alt bağımlılığı request başına yalnızca bir kez çağıracağını bilir.

        ThumbnailGenerationException exception = new ThumbnailGenerationException("Test", new Exception());

        // The message and cause constructor uses normal super call, so stack trace should be available
        assertTrue(exception.getStackTrace().length > 0);
    }

    @Test
    public void test_multipleNestedExceptions() {

  }

  @Override
  protected void tearDown() {
    tearDownStack.runTearDown();
  }

  /**
   * This first test doesn't test anything in Uninterruptibles, just demonstrates some normal
   * behavior of futures so that you can contrast the next test with it.
   */
  public void testRegularFutureInterrupted() throws ExecutionException {
    /*
     * Here's the order of events that we want.
     *

* Veri dönüştürme
* Veri doğrulama (validation)
* Otomatik dokümantasyon

## Özel tipler ve doğrulama { #special-types-and-validation }

`str`, `int`, `float` vb. normal tekil tiplerin yanında, `str`’den türeyen daha karmaşık tekil tipleri de kullanabilirsiniz.