///

Luego podemos crear un `AsyncClient` con la app y enviar requests asíncronos a ella, usando `await`.

{* ../../docs_src/async_tests/app_a_py39/test_main.py hl[9:12] *}

Esto es equivalente a:

```Python
response = client.get('/')
```

...que usábamos para hacer nuestros requests con el `TestClient`.

/// tip | Consejo

Nota que estamos usando async/await con el nuevo `AsyncClient`: el request es asíncrono.

///

                if (artifact.getVersion() == null) {
                    // set the recommended version
                    ArtifactVersion selected = artifact.getSelectedVersion();
                    // MNG-2123: null is a valid response to getSelectedVersion, don't
                    // assume it won't ever be.
                    if (selected != null) {
                        artifact.selectVersion(selected.toString());
                    } else {

…то, поскольку у `description` есть значение по умолчанию, даже если вы **ничего не вернёте** для этого поля, оно всё равно будет иметь это **значение по умолчанию**.

### Модель для данных ответа { #model-for-output-response-data }

Если поработать с интерактивной документацией и посмотреть ответ, то, хотя код ничего не добавил в одно из полей `description`, JSON‑ответ содержит значение по умолчанию (`null`):

<div class="screenshot">

        };

        // Test with timeout set
        client.setAccessTimeout(10);
        try {
            ResponseData result = client.doGet("storage://test/file.txt");
            assertNotNull("Response should not be null", result);
            assertEquals(200, result.getHttpStatusCode());
        } catch (Exception e) {
            fail("Should not throw exception: " + e.getMessage());
        }

ption":"","kibanaSavedObjectMeta":{"searchSourceJSON":"{\"query\":{\"query\":\"\",\"language\":\"kuery\"},\"filter\":[],\"indexRefName\":\"kibanaSavedObjectMeta.searchSourceJSON.index\"}"},"title":"average-response-time","uiStateJSON":"{}","version":1,"visState":"{\"title\":\"average-response-time\",\"type\":\"area\",\"params\":{\"type\":\"area\",\"grid\":{\"categoryLines\":false},\"categoryAxes\":[{\"id\":\"CategoryAxis-1\",\"type\":\"category\",\"position\":\"bottom\",\"show\":true,\"style\":{...

labels.start=Start
labels.loginRequired=Login Required
labels.loginLink=Show Login Link
labels.threadName=Thread Name
labels.url=URL
labels.userFavorite=Favorite Log
labels.userInfo=User Info
labels.webApiJson=JSON Response
labels.webConfigName=Web Crawl Config Name
labels.allLanguages=All Languages
labels.dictId=Dictionary ID
labels.docId=Document ID
labels.endTime=End Time
labels.hq=hq
labels.inputs=Inputs

        in 100..199 -> "Informational"
        in 200..299 -> "OK"
        in 300..399 -> "Redirection"
        in 400..499 -> "Client Error"
        in 500..599 -> "Server Error"
        else -> "Mock Response"
      }
    return apply { status = "HTTP/1.1 $code $reason" }
  }

  fun clearHeaders() =
    apply {
      headersBuilder = Headers.Builder()
    }

  fun addHeader(header: String) =

{* ../../docs_src/custom_request_and_route/tutorial003_py310.py hl[26] *}

Nesse exemplo, as *operações de rota* sob o `router` irão usar a classe `TimedRoute` personalizada, e terão um cabeçalho extra `X-Response-Time` na resposta com o tempo que levou para gerar a resposta:

... então, como `description` tem um valor padrão, se você **não retornar nada** para esse campo, ele ainda terá o **valor padrão**.

### Modelo para Dados de Resposta de Saída { #model-for-output-response-data }

Se você interagir com a documentação e verificar a resposta, mesmo que o código não tenha adicionado nada em um dos campos `description`, a resposta JSON contém o valor padrão (`null`):

<div class="screenshot">

  professional setting

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