上面的例子展示了需要的所有部分，但还不够实用，因为你本可以只是直接返回 `item`，而 **FastAPI** 默认帮你把这个 `item` 放到 `JSONResponse` 中，又默认将其转换成了 `dict` 等等。

现在，让我们看看你如何才能返回一个自定义的响应。

假设你想要返回一个 [XML](https://en.wikipedia.org/wiki/XML) 响应。

你可以把你的 XML 内容放到一个字符串中，放到一个 `Response` 中，然后返回：

{* ../../docs_src/response_directly/tutorial002_py310.py hl[1,18] *}

## 响应模型如何工作 { #how-a-response-model-works }

/**
 * A mutable class-to-instance map backed by an arbitrary user-provided map. See also {@link
 * ImmutableClassToInstanceMap}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#classtoinstancemap">{@code
 * ClassToInstanceMap}</a>.
 *
 * @author Kevin Bourrillion
 * @since 2.0
 */
@J2ktIncompatible
@GwtIncompatible

 * position in the order of the values). Undefined behavior and bugs will result.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#multimap">{@code Multimap}</a>.
 *
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
public interface SortedSetMultimap<K extends @Nullable Object, V extends @Nullable Object>

설명은 보통 길어지고 여러 줄에 걸쳐있기 때문에, *경로 처리* 설명을 함수 <dfn title="문서화에 사용되는 함수 내부 첫 표현식의 여러 줄 문자열(어떤 변수에도 할당되지 않음)">독스트링</dfn>에 선언할 수 있으며, **FastAPI**는 그곳에서 이를 읽습니다.

독스트링에는 [Markdown](https://en.wikipedia.org/wiki/Markdown)을 작성할 수 있으며, (독스트링의 들여쓰기를 고려하여) 올바르게 해석되고 표시됩니다.

{* ../../docs_src/path_operation_configuration/tutorial004_py310.py hl[17:25] *}

이는 대화형 문서에서 사용됩니다:

## 回傳自訂 `Response` { #returning-a-custom-response }

上面的範例展示了所需的各個部分，但目前還不太實用，因為你其實可以直接回傳 `item`，**FastAPI** 就會幫你把它放進 `JSONResponse`，轉成 `dict` 等，這些都是預設行為。

現在來看看如何用它來回傳自訂回應。

假設你想要回傳一個 [XML](https://en.wikipedia.org/wiki/XML) 回應。

你可以把 XML 內容放進一個字串，把它放進 `Response`，然後回傳它：

{* ../../docs_src/response_directly/tutorial002_py310.py hl[1,18] *}

## 回應模型如何運作 { #how-a-response-model-works }

 * null-hostile method like {@link ImmutableTable#copyOf}. For alternatives, please see <a
 * href="https://github.com/google/guava/wiki/NewCollectionTypesExplained#table">the wiki</a>.
 *
 * <p>The allowed row and column keys must be supplied when the table is created. The table always
 * contains a mapping for every row key / column pair. The value corresponding to a given row and

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## Scope

 * position in the order of the values). Undefined behavior and bugs will result.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#multimap">{@code Multimap}</a>.
 *
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible
public interface SortedSetMultimap<K extends @Nullable Object, V extends @Nullable Object>

 * An {@code EnumBiMap} and its inverse are both serializable.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#bimap">{@code BiMap}</a>.
 *
 * @author Mike Bostock
 * @since 2.0
 */
@GwtCompatible
@J2ktIncompatible

 * An {@code EnumBiMap} and its inverse are both serializable.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#bimap">{@code BiMap}</a>.
 *
 * @author Mike Bostock
 * @since 2.0
 */
@GwtCompatible
@J2ktIncompatible