Vous pouvez déclarer des « paramètres » ou « variables » de chemin avec la même syntaxe utilisée par les chaînes de format Python :

{* ../../docs_src/path_params/tutorial001_py310.py hl[6:7] *}

La valeur du paramètre de chemin `item_id` sera transmise à votre fonction dans l'argument `item_id`.

Donc, si vous exécutez cet exemple et allez sur [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo), vous verrez comme réponse :

```JSON
{"item_id":"foo"}

 * This exception wraps Lucene's ParseException to provide consistent error handling
 * within the Fess search framework.
 *
 */
public class QueryParseException extends FessSystemException {

    /** Serial version UID for serialization compatibility */
    private static final long serialVersionUID = 1L;

    /**
     * Constructs a new QueryParseException with the specified ParseException as the cause.
     *

 * query is malformed, contains invalid syntax, or violates query constraints.
 */
public class InvalidQueryException extends FessSystemException {

    /** Serial version UID for serialization */
    private static final long serialVersionUID = 1L;

    /** Message code for localized error messages */
    private final transient VaMessenger<FessMessages> messageCode;

    /**

* Si le paramètre est aussi déclaré dans le **chemin**, il sera utilisé comme paramètre de chemin.
* Si le paramètre est d'un **type singulier** (comme `int`, `float`, `str`, `bool`, etc.), il sera interprété comme un paramètre de **requête**.
* Si le paramètre est déclaré comme ayant pour type un **modèle Pydantic**, il sera interprété comme faisant partie du **corps** de la requête.

/// note | Remarque

 * such as configuration errors, initialization failures, or critical runtime issues.
 */
public class FessSystemException extends RuntimeException {

    /** Serial version UID for serialization compatibility */
    private static final long serialVersionUID = 1L;

    /**
     * Constructs a new FessSystemException with the specified detail message and cause.
     *

import org.jspecify.annotations.Nullable;

/**
 * Implementation of {@link ImmutableSet} with exactly one element.
 *
 * @author Kevin Bourrillion
 * @author Nick Kralevich
 */
@GwtCompatible
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
final class SingletonImmutableSet<E> extends ImmutableSet<E> {
  // We deliberately avoid caching the asList and hashCode here, to ensure that with

/**
 * An {@link ImmutableAsList} implementation specialized for when the delegate collection is already
 * backed by an {@code ImmutableList} or array.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@SuppressWarnings("serial") // uses writeReplace, not default serialization
class RegularImmutableAsList<E> extends ImmutableAsList<E> {
  private final ImmutableCollection<E> delegate;
  private final ImmutableList<? extends E> delegateList;

 * This exception is typically used for issues during dictionary file
 * reading, writing, parsing, or other dictionary-related operations.
 */
public class DictionaryException extends FessSystemException {

    /** Serial version UID for serialization. */
    private static final long serialVersionUID = 1L;

    /**
     * Creates a new DictionaryException with the specified message and cause.
     *

import org.jspecify.annotations.Nullable;

/**
 * Implementation of {@link ImmutableMultiset} with zero or more elements.
 *
 * @author Jared Levy
 * @author Louis Wasserman
 */
@GwtCompatible
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
final class RegularImmutableMultiset<E> extends ImmutableMultiset<E> {
  static final RegularImmutableMultiset<Object> EMPTY =

import java.util.Comparator;
import org.jspecify.annotations.Nullable;

/**
 * An immutable sorted multiset with one or more distinct elements.
 *
 * @author Louis Wasserman
 */
@SuppressWarnings("serial") // uses writeReplace, not default serialization
@GwtIncompatible
final class RegularImmutableSortedMultiset<E> extends ImmutableSortedMultiset<E> {
  private static final long[] zeroCumulativeCounts = {0};