```

::: fastapi.Depends

## `Security()`

For many scenarios, you can handle security (authorization, authentication, etc.) with dependencies, using `Depends()`.

But when you want to also declare OAuth2 scopes, you can use `Security()` instead of `Depends()`.

You can import `Security()` directly from `fastapi`:

```python
from fastapi import Security
```

## Dependencies errors and return values

You can use the same dependency *functions* you use normally.

### Dependency requirements

They can declare request requirements (like headers) or other sub-dependencies:

=== "Python 3.9+"

    ```Python hl_lines="8  13"
    {!> ../../../docs_src/dependencies/tutorial006_an_py39.py!}
    ```

=== "Python 3.8+"

# Security Tools

When you need to declare dependencies with OAuth2 scopes you use `Security()`.

But you still need to define what is the dependable, the callable that you pass as a parameter to `Depends()` or `Security()`.

There are multiple tools that you can use to create those dependables, and they get integrated into OpenAPI so they are shown in the automatic docs UI, they can be used by automatically generated clients and SDKs, etc.

# WebSockets

When defining WebSockets, you normally declare a parameter of type `WebSocket` and with it you can read data from the client and send data to it.

It is provided directly by Starlette, but you can import it from `fastapi`:

```python
from fastapi import WebSocket
```

!!! tip

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## Declare como um parâmetro

Para adicionar o corpo na *função de operação de rota*, declare-o da mesma maneira que você declarou parâmetros de rota e consulta:

```Python hl_lines="18"
{!../../../docs_src/body/tutorial001.py!}
```

...E declare o tipo como o modelo que você criou, `Item`.

## Resultados

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.internal;

/**
 * Equivalent to {@code Transformer}, but does not declare nullability due to Java 6 restrictions.
 *
 * <p>A {@code Transformer} transforms objects of type.</p>
 *
 * <p>Implementations are free to return new objects or mutate the incoming value.</p>
 *

public abstract class KotlinForwardDeclarationProviderFactory : KotlinOptionalPlatformComponent {
    /**
     * Create a Kotlin/Native declaration provider for [ktModule].
     *
     * Generally, only Kotlin/Native KLIB libraries can declare forward declarations.
     * For other types of [KtModule]s the provider normally shouldn't be created.
     *
     * @return a declaration provider for [ktModule] or `null` if the module cannot contain forward declarations

These functions can be declared with `async def` or normal `def`.

### `startup` event

To add a function that should be run before the application starts, declare it with the event `"startup"`:

```Python hl_lines="8"
{!../../../docs_src/events/tutorial001.py!}
```

        );
    }

    private String missingScopeMessage(Class<?> serviceType) {
        return String.format(
            "The service '%s' is registered in the '%s' scope but does not declare it. " +
                "Add the '@ServiceScope()' annotation on '%s' with the '%s' scope.",
            serviceType.getName(), scope.getSimpleName(), serviceType.getSimpleName(), scope.getSimpleName()
        );
    }

	// across UPDATE/PATCH requests.
	CRDValidationRatcheting featuregate.Feature = "CRDValidationRatcheting"

	// owner: @jpbetz
	// alpha: v1.30
	//
	// CustomResourceDefinitions may include SelectableFields to declare which fields
	// may be used as field selectors.
	CustomResourceFieldSelectors featuregate.Feature = "CustomResourceFieldSelectors"
)

func init() {