如果你想完全禁用 OpenAPI 模式，可以将其设置为 `openapi_url=None`，这样也会禁用使用它的文档用户界面。

## 文档 URLs { #docs-urls }

你可以配置两个文档用户界面，包括：

- **Swagger UI**：服务于 `/docs`。
    - 可以使用参数 `docs_url` 设置它的 URL。
    - 可以通过设置 `docs_url=None` 禁用它。
- **ReDoc**：服务于 `/redoc`。
    - 可以使用参数 `redoc_url` 设置它的 URL。
    - 可以通过设置 `redoc_url=None` 禁用它。

例如，设置 Swagger UI 服务于 `/documentation` 并禁用 ReDoc：

這種情況下，你可以設定 `response_model=None` 來停用回應模型的產生：

{* ../../docs_src/response_model/tutorial003_05_py310.py hl[7] *}

這會讓 FastAPI 略過回應模型的產生，如此你就能使用任何你需要的回傳型別註解，而不會影響你的 FastAPI 應用程式。🤓

## 回應模型編碼參數 { #response-model-encoding-parameters }

你的回應模型可能有預設值，例如：

{* ../../docs_src/response_model/tutorial004_py310.py hl[9,11:12] *}

* `description: Union[str, None] = None`（或在 Python 3.10 中的 `str | None = None`）預設為 `None`。

import subprocess
import time

import httpx
from playwright.sync_api import Playwright, sync_playwright


# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()

     * @return the classifier or an empty string if none, never {@code null}
     * @see ArtifactCoordinates#getClassifier()
     */
    @Nonnull
    String getClassifier();

    /**
     * Returns the file extension of the artifact.
     * The dot separator is not included in the returned string.
     *
     * @return the file extension or an empty string if none, never {@code null}

def get_authorization_scheme_param(
    authorization_header_value: str | None,
) -> tuple[str, str]:
    if not authorization_header_value:
        return "", ""
    scheme, _, param = authorization_header_value.partition(" ")

    )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "item_id": 5,
        "item": {
            "name": "Foo",
            "description": None,
            "price": 35.4,
            "tax": None,
            "tags": [],
        },
    }


def test_put_empty_body(client: TestClient):
    response = client.put(
        "/items/5",
        json={},
    )

まず、もちろん、`Path`と`Query`とリクエストボディのパラメータ宣言は自由に混ぜることができ、 **FastAPI** は何をするべきかを知っています。

また、デフォルトを`None`に設定することで、ボディパラメータをオプションとして宣言することもできます:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note | 備考

この場合、ボディから取得する`item`はオプションであることに注意してください。デフォルト値が`None`になっているためです。

///

## 複数のボディパラメータ { #multiple-body-parameters }

from fastapi import FastAPI
from fastapi.routing import APIRoute

app = FastAPI()


@app.get("/items/")
async def read_items():
    return [{"item_id": "Foo"}]


def use_route_names_as_operation_ids(app: FastAPI) -> None:
    """
    Simplify operation IDs so that generated API clients have simpler function
    names.

    Should be called only after all routes have been added.
    """
    for route in app.routes:

					{ "id": "1002", "type": "Chocolate" },
					{ "id": "1003", "type": "Blueberry" },
					{ "id": "1004", "type": "Devil's Food" }
				]
		},
	"topping":
		[
			{ "id": "5001", "type": "None" },
			{ "id": "5002", "type": "Glazed" },
			{ "id": "5005", "type": "Sugar" },
			{ "id": "5007", "type": "Powdered Sugar" },
			{ "id": "5006", "type": "Chocolate with Sprinkles" },
			{ "id": "5003", "type": "Chocolate" },

import subprocess

from playwright.sync_api import Playwright, sync_playwright


# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()
    page.goto("http://localhost:8000/docs")