# Without aliases


@app.post("/required-list-str", operation_id="required_list_str")
async def read_required_list_str(p: Annotated[list[str], Body(embed=True)]):
    return {"p": p}


class BodyModelRequiredListStr(BaseModel):
    p: list[str]


@app.post("/model-required-list-str", operation_id="model_required_list_str")

# =====================================================================================
# Without aliases


@app.post("/optional-str", operation_id="optional_str")
async def read_optional_str(p: Annotated[str | None, Body(embed=True)] = None):
    return {"p": p}


class BodyModelOptionalStr(BaseModel):
    p: str | None = None


@app.post("/model-optional-str", operation_id="model_optional_str")

```Python
item: Item = Body(embed=True)
```

як у прикладі:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}


У цьому випадку **FastAPI** очікуватиме тіло такого вигляду:

```JSON hl_lines="2"
{
    "item": {

```Python
item: Item = Body(embed=True)
```

como em:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}

Neste caso o **FastAPI** esperará um corpo como:

```JSON hl_lines="2"
{
    "item": {

```Python
item: Item = Body(embed=True)
```

como en:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}

En este caso, **FastAPI** esperará un cuerpo como:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",

`Body` 也具有與 `Query`、`Path` 以及之後你會看到的其他工具相同的額外驗證與中繼資料參數。

///

## 嵌入單一 Body 參數 { #embed-a-single-body-parameter }

假設你只有一個來自 Pydantic 模型 `Item` 的單一 `item` Body 參數。

預設情況下，**FastAPI** 會直接期望該模型的內容作為請求主體。

但如果你想讓它像宣告多個 Body 參數時那樣，期望一個帶有 `item` 鍵、其內含模型內容的 JSON，你可以使用 `Body` 的特殊參數 `embed`：

```Python
item: Item = Body(embed=True)
```

如下：

```Python
item: Item = Body(embed=True)
```

yani şöyle:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}


Bu durumda **FastAPI** şu şekilde bir body bekler:

```JSON hl_lines="2"
{

class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item = Body(embed=True)):
    results = {"item_id": item_id, "item": item}

class Item(BaseModel):
    name: str
    description: str | None = None
    size: float


app = FastAPI()


@app.post("/items/")
async def create_item(item: Annotated[Item, Body(embed=True)]) -> Item:

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