You probably read before that you can set a default [Response Status Code](../tutorial/response-status-code.md){.internal-link target=_blank}.

But in some cases you need to return a different status code than the default.

## Use case { #use-case }

For example, imagine that you want to return an HTTP status code of "OK" `200` by default.

		scratch:   &scratch{data: make([]byte, 1024)},
		metaCh:    make(chan *MetaValue, 128),
	}
	if emitDepth < 0 {
		d.emitDepth = 0
		d.emitRecursive = true
	}
	return d
}

// ObjectAsKVS - by default JSON returns map[string]interface{} this
// is usually fine in most cases, but when you need to preserve the
// input order its not a right data structure. To preserve input
// order please use this option.

</html>
"""


@app.get("/")
async def get():
    return HTMLResponse(html)


async def get_cookie_or_token(
    websocket: WebSocket,
    session: Union[str, None] = Cookie(default=None),
    token: Union[str, None] = Query(default=None),
):
    if session is None and token is None:
        raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION)
    return session or token

Entonces:

```Python
q: str | None = Query(default=None)
```

...hace que el parámetro sea opcional, con un valor por defecto de `None`, lo mismo que:


```Python

 * executor service as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
 * default} methods. Instead, it inherits their default implementations. When those implementations
 * invoke methods, they invoke methods on the {@code ForwardingListeningExecutorService}.
 *
 * @author Isaac Shum

import org.apache.maven.api.services.LifecycleRegistry;
import org.apache.maven.api.services.PackagingRegistry;
import org.apache.maven.impl.model.DefaultLifecycleBindingsInjector;

import static org.apache.maven.api.Lifecycle.DEFAULT;

@Singleton
@Named
@Priority(5)
@Deprecated
public class EmptyLifecycleBindingsInjector extends DefaultLifecycleBindingsInjector {

    private static LifecycleRegistry lifecycleRegistry;

import org.apache.maven.api.services.LifecycleRegistry;
import org.apache.maven.api.services.PackagingRegistry;
import org.apache.maven.impl.model.DefaultLifecycleBindingsInjector;

import static org.apache.maven.api.Lifecycle.DEFAULT;

@Singleton
@Named
@Priority(5)
public class EmptyLifecycleBindingsInjector extends DefaultLifecycleBindingsInjector {

    private static LifecycleRegistry lifecycleRegistry;

    }

    /**
     * Attempts to load the named implementation, uses default implementation if no name is given.
     *
     * @param name The optional implementation name
     * @param defaultClazz The default implementation type
     * @return Custom implementation type if one was given; otherwise default implementation type
     */

   |
   | Default: ${user.home}/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->

  <!-- interactiveMode
   | This will determine whether maven prompts you when it needs input. If set to false,
   | maven will use a sensible default value, perhaps based on some other setting, for
   | the parameter in question.
   |
   | Default: true
  <interactiveMode>true</interactiveMode>

        def query_example(
            data: Union[str, None] = Query(
                default=None,
                example="query1",
            ),
        ):
            return data

    @app.get("/query_examples/")
    def query_examples(
        data: Union[str, None] = Query(
            default=None,
            examples=["query1", "query2"],
        ),
    ):
        return data