RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt

# (1)!
COPY ./main.py /code/

# (2)!
CMD ["fastapi", "run", "main.py", "--port", "80"]
```

1. Copy the `main.py` file to the `/code` directory directly (without any `./app` directory).

2. Use `fastapi run` to serve your application in the single file `main.py`.

## 允許沒有 Content-Type 的請求 { #allowing-requests-without-content-type }

若你需要支援未送出 `Content-Type` 標頭的客戶端，可以將 `strict_content_type=False` 以停用嚴格檢查：

{* ../../docs_src/strict_content_type/tutorial001_py310.py hl[4] *}

啟用此設定後，缺少 `Content-Type` 標頭的請求會將其主體解析為 JSON，這與舊版 FastAPI 的行為相同。

/// info | 資訊

此行為與設定新增於 FastAPI 0.132.0。

#
# This file is autogenerated by pip-compile with Python 3.14
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.3.0 \
    --hash=sha256:9824a48b654a306168f63e0d97714665f8490b8d89ec7bf2efc24bf67cf579b3 \
    --hash=sha256:d96fda5c884f1b22178852f30ffa85766d50b99e00775ea626c23304f582fc4f
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

#
# This file is autogenerated by pip-compile with Python 3.11
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.2.2 \
    --hash=sha256:bf25b2c2eed013ca456918c453d687eab4e8309fba81ee2f4c1a6aa2494175eb \
    --hash=sha256:e5797bc6abe45f64fd95dc06394ca3f2bedf3b5d895e9da691c9ee3397d70092
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

你也可以指定你的後端是否允許：

* 憑證（credentials，例如 Authorization 標頭、Cookie 等）。
* 特定的 HTTP 方法（如 `POST`、`PUT`），或使用萬用字元 `"*"` 表示全部。
* 特定的 HTTP 標頭，或使用萬用字元 `"*"` 表示全部。

{* ../../docs_src/cors/tutorial001_py310.py hl[2,6:11,13:19] *}

`CORSMiddleware` 的實作在預設參數上相當嚴格，因此你需要明確啟用特定的來源、方法或標頭，瀏覽器才會允許在跨網域情境中使用它們。

支援以下參數：

* `allow_origins` - 允許進行跨來源請求的來源清單。例如 `['https://example.org', 'https://www.example.org']`。你可以使用 `['*']` 來允許任何來源。

```console
$ <font color="#4E9A06">fastapi</font> run --workers 4 <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories with
             <font color="#3465A4">__init__.py</font> files

```console
$ <font color="#4E9A06">fastapi</font> run --workers 4 <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories with
             <font color="#3465A4">__init__.py</font> files

</div>

### Docs Structure

The documentation uses [MkDocs](https://www.mkdocs.org/).

And there are extra tools/scripts in place to handle translations in `./scripts/docs.py`.

/// tip

You don't need to see the code in `./scripts/docs.py`, you just use it in the command line.

///

All the documentation is in Markdown format in the directory `./docs/en/`.

Many of the tutorials have blocks of code.

#
# This file is autogenerated by pip-compile with Python 3.10
# by the following command:
#
#    bazel run //ci/official/requirements_updater:requirements.update
#
absl-py==2.2.2 \
    --hash=sha256:bf25b2c2eed013ca456918c453d687eab4e8309fba81ee2f4c1a6aa2494175eb \
    --hash=sha256:e5797bc6abe45f64fd95dc06394ca3f2bedf3b5d895e9da691c9ee3397d70092
    # via
    #   keras-nightly
    #   tb-nightly
astor==0.7.1 \

```console
$ <font color="#4E9A06">fastapi</font> run --workers 4 <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories with
             <font color="#3465A4">__init__.py</font> files