"/items/foo",
        json={
            "name": "Fooz",
            "description": "Item description",
            "price": 3,
            "tax": 10.5,
            "tags": ["tag1", "tag2"],
        },
    )
    assert response.json() == {
        "name": "Fooz",
        "description": "Item description",
        "price": 3,
        "tax": 10.5,
        "tags": ["tag1", "tag2"],
    }

    size: Annotated[int | None, Body()] = None,
):
    if item_id in items:
        item = items[item_id]
        item["name"] = name
        item["size"] = size
        return item
    else:
        item = {"name": name, "size": size}
        items[item_id] = item

from fastapi import FastAPI
from pydantic import BaseModel


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


app = FastAPI()


@app.post("/items/")
async def create_item(item: Item):
    item_dict = item.model_dump()
    if item.tax is not None:
        price_with_tax = item.price + item.tax
        item_dict.update({"price_with_tax": price_with_tax})

tasks.withType<Test>().configureEach {
    val testVersionProvider = javaLauncher.map { it.metadata.languageVersion }
    jvmArgumentProviders.add(CommandLineArgumentProvider {
        //allow ProjectBuilder to inject legacy types into the system classloader
        if (testVersionProvider.get().canCompileOrRun(9)) {
            listOf("--add-opens", "java.base/java.lang=ALL-UNNAMED")
        } else {
            emptyList()
        }
    })

      assertEquals(Protocol.HTTP_2, response.protocol());

      for (Certificate c: response.handshake().peerCertificates()) {
        X509Certificate x = (X509Certificate) c;
        System.out.println(x.getSubjectDN());
      }
    }
  }

    "user": {
        "username": "dave",
        "full_name": "Dave Grohl"
    }
}
```

/// note | Not

`item` daha öncekiyle aynı şekilde tanımlanmış olsa bile, artık body içinde `item` anahtarı altında gelmesi beklenir.

///

**FastAPI**, request'ten otomatik dönüşümü yapar; böylece `item` parametresi kendi içeriğini alır, `user` için de aynı şekilde olur.

constraints.URL.message = {item} is not a valid URL.
constraints.Required.message = {item} is required.
constraints.TypeInteger.message = {item} must be a number.
constraints.TypeLong.message = {item} must be a number.
constraints.TypeFloat.message = {item} must be a number.
constraints.TypeDouble.message = {item} must be a number.
constraints.TypeAny.message = {item} cannot be converted to {propertyType}.
constraints.UriType.message = {item} has an unrecognized URI.

constraints.URL.message = {item} is not a valid URL.
constraints.Required.message = {item} is required.
constraints.TypeInteger.message = {item} must be a number.
constraints.TypeLong.message = {item} must be a number.
constraints.TypeFloat.message = {item} must be a number.
constraints.TypeDouble.message = {item} must be a number.
constraints.TypeAny.message = {item} cannot be converted to {propertyType}.
constraints.UriType.message = {item} has an unrecognized URI.

```JSON
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,
        "tax": 3.2
    },
    "user": {
        "username": "dave",
        "full_name": "Dave Grohl"
    }
}
```

/// note | Hinweis

Beachten Sie, dass, obwohl `item` wie zuvor deklariert wurde, es nun unter einem Schlüssel `item` im Body erwartet wird.

///

Let's say you only have a single `item` body parameter from a Pydantic model `Item`.

By default, **FastAPI** will then expect its body directly.

But if you want it to expect a JSON with a key `item` and inside of it the model contents, as it does when you declare extra body parameters, you can use the special `Body` parameter `embed`:

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

as in: