API 基本上肯定要发送**响应体**，但是客户端不一定发送**请求体**。

使用 <a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> 模型声明**请求体**，能充分利用它的功能和优点。

/// info | "说明"

发送数据使用 `POST`（最常用）、`PUT`、`DELETE`、`PATCH` 等操作。

规范中没有定义使用 `GET` 发送请求体的操作，但不管怎样，FastAPI 也支持这种方式，只不过仅用于非常复杂或极端的用例。

我们不建议使用 `GET`，因此，在 Swagger UI 交互文档中不会显示有关 `GET` 的内容，而且代理协议也不一定支持 `GET`。

///

## 导入 Pydantic 的 `BaseModel`

* `CORSMiddleware` 임포트.
* 허용되는 출처(문자열 형식)의 리스트 생성.
* FastAPI 응용 프로그램에 "미들웨어(middleware)"로 추가.

백엔드에서 다음의 사항을 허용할지에 대해 설정할 수도 있습니다:

* 자격증명 (인증 헤더, 쿠키 등).
* 특정한 HTTP 메소드(`POST`, `PUT`) 또는 와일드카드 `"*"` 를 사용한 모든 HTTP 메소드.
* 특정한 HTTP 헤더 또는 와일드카드 `"*"` 를 사용한 모든 HTTP 헤더.

```Python hl_lines="2  6-11  13-19"
{!../../docs_src/cors/tutorial001.py!}
```

/// info | "Informação"

Para enviar dados, você deve usar utilizar um dos métodos: `POST` (Mais comum), `PUT`, `DELETE` ou `PATCH`.

Enviar um corpo em uma requisição `GET` não tem um comportamento definido nas especificações, porém é suportado pelo FastAPI, apenas para casos de uso bem complexos/extremos.

If it was in a type annotation we could have used the vertical bar, as:

```Python
some_variable: PlaneItem | CarItem
```

But if we put that in the assignment `response_model=PlaneItem | CarItem` we would get an error, because Python would try to perform an **invalid operation** between `PlaneItem` and `CarItem` instead of interpreting that as a type annotation.

	// uses *testing.B and the object Layer to run the benchmark.
	runPutObjectBenchmark(b, objLayer, objSize)
}

// creates Erasure/FS backend setup, obtains the object layer and runs parallel benchmark for put object.
func benchmarkPutObjectParallel(b *testing.B, instanceType string, objSize int) {
	// create a temp Erasure/FS backend.
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

Currently supported `FTP/SFTP` operations are as follows:

| ftp-client commands | supported |
|:-------------------:|:----------|
| get                 | yes       |
| put                 | yes       |
| ls                  | yes       |
| mkdir               | yes       |
| rmdir               | yes       |
| delete              | yes       |
| append              | no        |

      K key = (K) stream.readObject();
      @SuppressWarnings("unchecked") // reading data stored by writeMap
      V value = (V) stream.readObject();
      map.put(key, value);
    }
  }

  /**
   * Stores the contents of a multiset in an output stream, as part of serialization. It does not
   * support concurrent multisets whose content may change while the method is running.

            <T> T getUserData(String key) {
                getUserData()[key]
            }

            @Override
            <T> void putUserData(String key, T value) {
                getUserData().put(key, value)
            }
        }
        rule
    }

    // input nodes are sorted.
    ImmutableMap.Builder<N, GraphConnections<N, V>> nodeConnections = ImmutableMap.builder();
    for (N node : graph.nodes()) {
      nodeConnections.put(node, connectionsOf(graph, node));
    }
    return nodeConnections.buildOrThrow();
  }

  private static <N, V> GraphConnections<N, V> connectionsOf(ValueGraph<N, V> graph, N node) {

      for (int insertion = 0; insertion < totalInsertions; insertion++) {
        RandomHasherAction.pickAtRandom(random).performAction(random, sinksAndControl);
      }
      // We need to ensure that at least 4 bytes have been put into the hasher or else
      // Hasher#hash will throw an ISE.
      int intToPut = random.nextInt();
      for (Hasher hasher : sinksAndControl) {
        hasher.putInt(intToPut);
      }