And you can also declare body parameters as optional, by setting the default to `None`:

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

/// note

Notice that, in this case, the `item` that would be taken from the body is optional. As it has a `None` default value.

///

## Multiple body parameters { #multiple-body-parameters }

        env:
          TOKEN: ${{ secrets.FASTAPI_MKDOCS_MATERIAL_INSIDERS }}
      - name: Verify Docs
        run: python ./scripts/docs.py verify-docs
      - name: Export Language Codes
        id: show-langs
        run: |
          echo "langs=$(python ./scripts/docs.py langs-json)" >> $GITHUB_OUTPUT

  build-docs:
    needs:
      - changes
      - langs
    if: ${{ needs.changes.outputs.docs == 'true' }}

{* ../../docs_src/path_params_numeric_validations/tutorial001_py310.py hl[1] *}

## Declare metadados

Você pode declarar todos os parâmetros da mesma maneira que na `Query`.

Por exemplo para declarar um valor de metadado `title` para o parâmetro de rota `item_id` você pode digitar:

{* ../../docs_src/path_params_numeric_validations/tutorial001_py310.py hl[8] *}

/// note | Nota

💭 🌐 👈 **"4️⃣0️⃣4️⃣ 🚫 🔎"** ❌ (& 🤣) ❓

## ⚙️ `HTTPException`

📨 🇺🇸🔍 📨 ⏮️ ❌ 👩‍💻 👆 ⚙️ `HTTPException`.

### 🗄 `HTTPException`

{* ../../docs_src/handling_errors/tutorial001.py hl[1] *}

### 🤚 `HTTPException` 👆 📟

`HTTPException` 😐 🐍 ⚠ ⏮️ 🌖 📊 🔗 🔗.

↩️ ⚫️ 🐍 ⚠, 👆 🚫 `return` ⚫️, 👆 `raise` ⚫️.

## Використання `HTTPException`

Щоб повернути HTTP-відповіді з помилками клієнту, використовуйте `HTTPException`.

### Імпорт `HTTPException`

{* ../../docs_src/handling_errors/tutorial001.py hl[1] *}

### Використання `HTTPException` у коді

`HTTPException` — це звичайна помилка Python із додатковими даними, які стосуються API.

{* ../../docs_src/dependencies/tutorial007.py hl[2:4] *}

The yielded value is what is injected into *path operations* and other dependencies:

{* ../../docs_src/dependencies/tutorial007.py hl[4] *}

The code following the `yield` statement is executed after creating the response but before sending it:

{* ../../docs_src/dependencies/tutorial007.py hl[5:6] *}

/// tip

You can use `async` or regular functions.

🛠️ 👈 🌐 📨 📨 🔜 👯‍♂️ `https` ⚖️ `wss`.

🙆 📨 📨 `http` ⚖️ `ws` 🔜 ❎ 🔐 ⚖ ↩️.

{* ../../docs_src/advanced_middleware/tutorial001.py hl[2,6] *}

## `TrustedHostMiddleware`

🛠️ 👈 🌐 📨 📨 ✔️ ☑ ⚒ `Host` 🎚, ✔ 💂‍♂ 🛡 🇺🇸🔍 🦠 🎚 👊.

{* ../../docs_src/advanced_middleware/tutorial002.py hl[2,6:8] *}

📄 ❌ 🐕‍🦺:

{* ../../docs_src/path_operation_advanced_configuration/tutorial001.py hl[6] *}

### *path operation関数* の名前をoperationIdとして使用する

APIの関数名を `operationId` として利用したい場合、すべてのAPIの関数をイテレーションし、各 *path operation* の `operationId` を `APIRoute.name` で上書きすれば可能です。

そうする場合は、すべての *path operation* を追加した後に行う必要があります。

{* ../../docs_src/path_operation_advanced_configuration/tutorial002.py hl[2,12:21,24] *}

/// tip | 豆知識

You can set them as follows:

{* ../../docs_src/metadata/tutorial001.py hl[3:16, 19:32] *}

/// tip

You can write Markdown in the `description` field and it will be rendered in the output.

///

With this configuration, the automatic API docs would look like:

<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>
<font color="#3465A4">INFO    </font> Resolved absolute path <font color="#75507B">/home/user/code/awesomeapp/</font><font color="#AD7FA8">main.py</font>
<font color="#3465A4">INFO    </font> Searching for package file structure from directories with <font color="#3465A4">__init__.py</font> files