* provider value using the supplied combiner function.
     *
     * <p>
     * The resulting provider will be live, so that each time it is queried, it queries both this and the supplied provider
     * and applies the combiner to the results. Whenever any of the providers has no value, the new provider
     * will also have no value and the combiner will not be called.
     * </p>
     *
     * <p>

     * provider value using the supplied combiner function.
     *
     * <p>
     * The resulting provider will be live, so that each time it is queried, it queries both supplied providers
     * and applies the combiner to the results. Whenever any of the providers has no value, the new provider
     * will also have no value and the combiner will not be called.
     * </p>
     *
     * <p>

     */
    ExecutionTimeValue<? extends T> calculateExecutionTimeValue();

    @Override
    default <U, R> Provider<R> zip(Provider<U> right, BiFunction<? super T, ? super U, ? extends R> combiner) {
        return new BiProvider<>(null, this, right, combiner);
    }

    /**
     * Returns a provider that attaches the side effect to the values it produces.
     * <p>

import java.util.Deque;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Predicate;
import java.util.stream.Stream;

import static org.gradle.internal.Combiners.nonCombining;

public class WatchableHierarchies {
    private static final Logger LOGGER = LoggerFactory.getLogger(WatchableHierarchies.class);

La documentation sera donc mise à jour automatiquement pour autoriser plusieurs valeurs :

<img src="/img/tutorial/query-params-str-validations/image02.png">

### Combiner liste de paramètres et valeurs par défaut

Et l'on peut aussi définir une liste de valeurs par défaut si aucune n'est fournie :

```Python hl_lines="9"
{!../../../docs_src/query_params_str_validations/tutorial012.py!}

!!! check "A inspiré **FastAPI** à"
Être un micro-framework. Il est donc facile de combiner les outils et les pièces nécessaires.

Proposer un système de routage simple et facile à utiliser.

### <a href="https://requests.readthedocs.io" class="external-link" target="_blank">Requests</a>