die benutzerdefinierte `TimedRoute`-Klasse und haben in der Response einen zusätzlichen `X-Response-Time`-Header mit der Zeit, die zum Generieren der Response benötigt wurde:

{* ../../docs_src/custom_request_and_route/tutorial003.py hl[13:20] *}...

operations* under the `router` will use the custom `TimedRoute` class, and will have an extra `X-Response-Time` header in the response with the time it took to generate the response:

{* ../../docs_src/custom_request_and_route/tutorial003.py hl[13:20] *}...

  public void testJoin() {
    assertThat(Doubles.join(",", EMPTY)).isEmpty();
    assertThat(Doubles.join(",", ARRAY1)).isEqualTo("1.0");
    assertThat(Doubles.join(",", 1.0, 2.0)).isEqualTo("1.0,2.0");
    assertThat(Doubles.join("", 1.0, 2.0, 3.0)).isEqualTo("1.02.03.0");
  }

  public void testJoinNonTrivialDoubles() {
    assertThat(Doubles.join(",", EMPTY)).isEmpty();

    @Test
    @DisplayName("getSessionKey returns bytes, empty, then null")
    void getSessionKey_variants() throws CIFSException {
        byte[] key = new byte[] { 10, 20 };
        when(session.getSessionKey()).thenReturn(key, new byte[0], null);

        assertArrayEquals(key, session.getSessionKey());
        assertArrayEquals(new byte[0], session.getSessionKey());

Und Sie können auch Body-Parameter als optional kennzeichnen, indem Sie den Defaultwert auf `None` setzen:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note | Hinweis

Beachten Sie, dass in diesem Fall das `item`, welches vom Body genommen wird, optional ist. Da es `None` als Defaultwert hat.

///

## Mehrere Body-Parameter

And you can also declare body parameters as optional, by setting the default to `None`:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note

Notice that, in this case, the `item` that would be taken from the body is optional. As it has a `None` default value.

///

## Multiple body parameters { #multiple-body-parameters }

{* ../../docs_src/path_operation_configuration/tutorial004.py hl[19:27] *}

이는 대화형 문서에서 사용됩니다:

<img src="/img/tutorial/path-operation-configuration/image02.png">

## 응답 기술

`response_description` 매개변수로 응답에 관한 설명을 명시할 수 있습니다:

operations* bajo el `router` usarán la clase personalizada `TimedRoute`, y tendrán un header `X-Response-Time` extra en el response con el tiempo que tomó generar el response:

{* ../../docs_src/custom_request_and_route/tutorial003.py hl[13:20] *}...

docstringに<a href="https://en.wikipedia.org/wiki/Markdown" class="external-link" target="_blank">Markdown</a>を記述すれば、正しく解釈されて表示されます。（docstringのインデントを考慮して）

{* ../../docs_src/path_operation_configuration/tutorial004.py hl[19:27] *}

これは対話的ドキュメントで使用されます:

<img src="https://fastapi.tiangolo.com/img/tutorial/path-operation-configuration/image02.png">

## レスポンスの説明

`response_description`パラメータでレスポンスの説明をすることができます。

Previously OkHttp added a synthetic response header, `OkHttp-Selected-Transport`. It
has been replaced with a new synthetic header, `OkHttp-Selected-Protocol`.

##### Changes

 * New: Support for `HTTP-draft-09/2.0`.
 * New: Support for `spdy/3.1`. Dropped support for `spdy/3`.
 * New: Use ALPN on Android platforms that support it (4.4+)
 * New: CacheControl model and parser.
 * New: Protocol selection in MockWebServer.