* concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary,
   * non-deterministic behavior at an undetermined time in the future.
   *
   * <p>Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally
   * speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent

      }
    } else {
      checkArgument(keyEntry == ABSENT, "Key already present: %s", key);
    }

    // insertion point for new entry is after predecessor
    // note predecessor must still be a valid entry: either we deleted an entry that was *not*
    // predecessor, or we didn't delete anything

    ensureCapacity(size + 1);
    keys[size] = key;
    values[size] = value;

///

它可以：

* 在响应中返回状态码
* 在 OpenAPI 概图（及用户界面）中存档：

<img src="/img/tutorial/response-status-code/image01.png">

/// note | 注意

某些响应状态码表示响应没有响应体（参阅下一章）。

FastAPI 可以进行识别，并生成表明无响应体的 OpenAPI 文档。

///

## 关于 HTTP 状态码 { #about-http-status-codes }

/// note | 注意

如果已经了解 HTTP 状态码，请跳到下一章。

///

在 HTTP 协议中，发送 3 位数的数字状态码是响应的一部分。

这些状态码都具有便于识别的关联名称，但是重要的还是数字。

简言之：

    Client->>Client: Process Item 1
    App->>Client: Send Item 2
    App->>App: Produce Item 3
    Client->>Client: Process Item 2
    App->>Client: Send Item 3
    Client->>Client: Process Item 3
    Note over App: Keeps producing...
    Note over Client: Keeps consuming...
```

Hatta, sürekli veri gönderdiğiniz sonsuz bir akış da olabilir.

## JSON Lines { #json-lines }

    client ->> dep_req: Запрос
    Note over dep_req: Выполнить код до yield
    dep_req ->> dep_func: Передать значение
    Note over dep_func: Выполнить код до yield
    dep_func ->> operation: Выполнить функцию-обработчик пути
    operation ->> dep_func: Выход из функции-обработчика пути
    Note over dep_func: Выполнить код после yield
    Note over dep_func: ✅ Зависимость закрыта

Bir [virtual environment](../virtual-environments.md) oluşturduğunuzdan, onu etkinleştirdiğinizden ve ardından paketi kurduğunuzdan emin olun. Örneğin:

```console
$ pip install python-multipart
```

///

/// note | Not

Bu özellik FastAPI `0.113.0` sürümünden itibaren desteklenmektedir. 🤓

///

## Form'lar için Pydantic Model'leri { #pydantic-models-for-forms }

          Function<? super T, ? extends V> valueFunction) {
    return CollectCollectors.toImmutableBiMap(keyFunction, valueFunction);
  }

  /**
   * Returns the empty bimap.
   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   */
  // Casting to any type is safe because the set will never hold any elements.
  @SuppressWarnings("unchecked")
  public static <K, V> ImmutableBiMap<K, V> of() {

* 상태 코드를 OpenAPI 스키마(따라서, 사용자 인터페이스에도)에 문서화합니다:

<img src="/img/tutorial/response-status-code/image01.png">

/// note | 참고

일부 응답 코드(다음 섹션 참고)는 응답에 본문이 없다는 것을 나타냅니다.

FastAPI는 이를 알고 있으며, 응답 본문이 없다고 명시하는 OpenAPI 문서를 생성합니다.

///

## HTTP 상태 코드에 대하여 { #about-http-status-codes }

/// note | 참고

만약 HTTP 상태 코드가 무엇인지 이미 알고 있다면, 다음 섹션으로 넘어가세요.

///

HTTP에서는 응답의 일부로 3자리 숫자 상태 코드를 보냅니다.

    Client->>Client: Process Item 1
    App->>Client: Send Item 2
    App->>App: Produce Item 3
    Client->>Client: Process Item 2
    App->>Client: Send Item 3
    Client->>Client: Process Item 3
    Note over App: Keeps producing...
    Note over Client: Keeps consuming...
```

Incluso podría ser un stream infinito, donde sigues enviando datos.

## JSON Lines { #json-lines }

```Python
contents = myfile.file.read()
```

/// note | Technische Details zu `async`

Wenn Sie die `async`-Methoden verwenden, führt **FastAPI** die Datei-Methoden in einem <abbr title="Mehrere unabhängige Kindprozesse">Threadpool</abbr> aus und erwartet sie.

///

/// note | Technische Details zu Starlette