* #iterator()} method after the first, and whose iterator is always unmodifiable.
 *
 * <p>The {@code Iterable} specification does not make it absolutely clear what should happen on a
 * second invocation, so implementors have made various choices, including:
 *
 * <ul>
 *   <li>returning the same iterator again
 *   <li>throwing an exception of some kind

    iterator.next(); // advance
    Entry<K, V> secondEntry = iterator.next();
    K key = secondEntry.getKey();
    SortedMap<K, V> subMap = map.tailMap(key);
    int subMapSize = subMap.size();
    subMap.clear();
    assertEquals(map.size(), oldSize - subMapSize);
    assertTrue(subMap.isEmpty());
  }

    mod = importlib.import_module(f"docs_src.openapi_callbacks.{request.param}")
    return mod


@pytest.fixture(name="client")
def get_client(mod: ModuleType):
    client = TestClient(mod.app)
    client.headers.clear()
    return client


def test_get(client: TestClient):
    response = client.post(
        "/invoices/", json={"id": "fooinvoice", "customer": "John", "total": 5.3}
    )

///

FastAPI will now:

* **Validate** the data making sure that the max length is 50 characters
* Show a **clear error** for the client when the data is not valid
* **Document** the parameter in the OpenAPI schema *path operation* (so it will show up in the **automatic docs UI**)

/// info | Informação

Para usar `EmailStr`, primeiro instale <a href="https://github.com/JoshData/python-email-validator" class="external-link" target="_blank">`email-validator`</a>.

Certifique-se de criar um [ambiente virtual](../virtual-environments.md){.internal-link target=_blank}, ative-o e instale-o, por exemplo:

```console
$ pip install email-validator
```

ou com:

```console

      buffer.writeUtf8(encodedNames[i])
      buffer.writeByte('='.code)
      buffer.writeUtf8(encodedValues[i])
    }

    if (countBytes) {
      byteCount = buffer.size
      buffer.clear()
    }

    return byteCount
  }

  class Builder
    @JvmOverloads
    constructor(
      private val charset: Charset? = null,
    ) {
      private val names = mutableListOf<String>()

/// info | Información

Los webhooks están disponibles en OpenAPI 3.1.0 y superiores, soportados por FastAPI `0.99.0` y superiores.

///

## Una aplicación con webhooks { #an-app-with-webhooks }

Cuando creas una aplicación de **FastAPI**, hay un atributo `webhooks` que puedes usar para definir *webhooks*, de la misma manera que definirías *path operations*, por ejemplo con `@app.webhooks.post()`.

{* ../../docs_src/first_steps/tutorial001_py39.py hl[3] *}

Aqui, a variável `app` será uma "instância" da classe `FastAPI`.

Este será o principal ponto de interação para criar toda a sua API.

### Passo 3: crie uma operação de rota { #step-3-create-a-path-operation }

#### Path { #path }

"Path" aqui se refere à última parte da URL, começando do primeiro `/`.

Pero también quieres que acepte nuevos elementos. Y cuando los elementos no existían antes, los crea y devuelve un código de estado HTTP de 201 "Created".

Para lograr eso, importa `JSONResponse`, y devuelve tu contenido allí directamente, configurando el `status_code` que deseas:

                try {
                    final int sessionIdListSize = finishedSessionIdList.size();
                    intervalControlHelper.setCrawlerRunning(true);

                    docList.clear();
                    accessResultList.clear();

                    updateTime = systemHelper.getCurrentTimeAsLong() - updateTime;

                    final long interval = updateInterval - updateTime;