* Returns a Writer that sends all output to the given {@link Appendable} target. Closing the
   * writer will close the target if it is {@link Closeable}, and flushing the writer will flush the
   * target if it is {@link java.io.Flushable}.
   *
   * @param target the object to which output will be sent
   * @return a new Writer object, unless target is a Writer, in which case the target is returned
   */

* 업로드 된 파일의 메타데이터를 얻을 수 있습니다.
* <a href="https://docs.python.org/3/glossary.html#term-file-like-object" class="external-link" target="_blank">file-like</a>  `async` 인터페이스를 갖고 있습니다.
* file-like object를 필요로하는 다른 라이브러리에 직접적으로 전달할 수 있는 파이썬 <a href="https://docs.python.org/3/library/tempfile.html#tempfile.SpooledTemporaryFile" class="external-link" target="_blank">`SpooledTemporaryFile`</a> 객체를 반환합니다.

### `UploadFile`

`UploadFile` 은 다음과 같은 어트리뷰트가 있습니다:

/// info | Інформація
`status_code` також може отримувати значення з `IntEnum`, наприклад, з Python <a href="https://docs.python.org/3/library/http.html#http.HTTPStatus" class="external-link" target="_blank">`http.HTTPStatus`</a>.

///

Він буде:

* Повертати вказаний код статусу у відповіді.
* Документувати його як такий у схемі OpenAPI (і, таким чином, в інтерфейсі користувача):

> 这个项目有怎样的历史？好像它只用了几周就从默默无闻变得众所周知……

在此，我们简单回顾一下 **FastAPI** 的历史。

## 备选方案

有那么几年，我曾领导数个开发团队为诸多复杂需求创建各种 API，这些需求包括机器学习、分布系统、异步任务、NoSQL 数据库等领域。

作为工作的一部分，我需要调研很多备选方案、还要测试并且使用这些备选方案。

**FastAPI** 其实只是延续了这些前辈的历史。

正如[备选方案](alternatives.md){.internal-link target=_blank}一章所述：

<blockquote markdown="1">

            false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnTarget = cci("target", "target", null, null, String.class, "target", null, false, false, false,
            "keyword", 0, 0, null, null, false, null, null, null, null, null, false);

    public ColumnInfo columnEndTime() {
        return _columnEndTime;
    }

## 本地测试 Traefik

您可以轻易地在本地使用 <a href="https://docs.traefik.io/" class="external-link" target="_blank">Traefik</a> 运行移除路径前缀的试验。

<a href="https://github.com/containous/traefik/releases" class="external-link" target="_blank">下载 Traefik</a>，这是一个二进制文件，需要解压文件，并在 Terminal 中直接运行。

然后创建包含如下内容的 `traefik.toml` 文件：

```TOML hl_lines="3"
[entryPoints]
  [entryPoints.http]

* <a href="https://docs.python.org/3/library/contextlib.html#contextlib.contextmanager" class="external-link" target="_blank">`@contextlib.contextmanager`</a> или
* <a href="https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager" class="external-link" target="_blank">`@contextlib.asynccontextmanager`</a>

будет корректной для использования в качестве зависимости **FastAPI**.

    } else {
      renameFaults.remove(file)
    }
  }

  @Throws(IOException::class)
  override fun atomicMove(
    source: Path,
    target: Path,
  ) {
    if (renameFaults.contains(source) || renameFaults.contains(target)) throw IOException("boom!")
    super.atomicMove(source, target)
  }

  @Throws(IOException::class)
  override fun delete(
    path: Path,
    mustExist: Boolean,
  ) {

ECL0094=IllegalArgumentException occurred when value({7}) of class {5}[{6}] is set to {2}[{3}] field({4}) of class({0})[{1}]. Target class is ({8})[{9}].
ECL0097=Value({1}) of property({0}) can not be converted. because {2}.
ECL0098=Exception occurred when value({7}) of class{5}[{6}] is set to {2}[{3}] property({4}) of class({0})[{1}]. Target class is ({8})[{9}].
ECL0099=Field({1}) of class({0}) is not a static field.

By default, **FastAPI** would automatically convert that return value to JSON using the `jsonable_encoder` explained in [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

Then, behind the scenes, it would put that JSON-compatible data (e.g. a `dict`) inside of a `JSONResponse` that would be used to send the response to the client.