final String[] roles2 = filterQueryString == null ? new String[0] : SuggestUtil.parseQuery(filterQueryString, roleFieldName);
        return Stream.concat(Arrays.stream(roles1), Arrays.stream(roles2)).toArray(String[]::new);
    }

    /**
     * Analyze text.
     * @param analyzer Analyzer
     * @param field Field
     * @param text Text

        }).collect(Collectors.toList());
    }

    private Stream<InstallationLocation> getAvailableJavaInstallationLocationSteam() {
        return Stream.concat(
            javaInstallationRegistry.listInstallations().stream(),
            Stream.of(new InstallationLocation(Jvm.current().getJavaHome(), "Current JVM"))
        );
    }

            entity.setUpdatedBy(username);
            entity.setUpdatedTime(currentTime);
            BeanUtil.copyBeanToBean(form, entity, op -> op.exclude(
                    Stream.concat(Stream.of(Constants.COMMON_CONVERSION_RULE), Stream.of(Constants.QUERIES)).toArray(n -> new String[n])));

    checkNotNull(thisNode);

    Iterator<EndpointPair<N>> resultWithDoubleSelfLoop;
    if (orderedNodeConnections == null) {
      resultWithDoubleSelfLoop =
          Iterators.concat(
              Iterators.transform(
                  predecessors().iterator(),
                  (N predecessor) -> EndpointPair.ordered(predecessor, thisNode)),
              Iterators.transform(

        lenientFormat("min (%s) must be less than or equal to max (%s)", min, max));
  }

  /**
   * Returns the values from each provided array combined into a single array. For example, {@code
   * concat(new float[] {a, b}, new float[] {}, new float[] {c}} returns the array {@code {a, b,
   * c}}.
   *
   * @param arrays zero or more {@code float} arrays

        }

        Set<String> jdkJarHellClasses = runJdkJarHellCheck();

        if (missingClassExcludes != null) {
            long bogousExcludesCount = Stream.concat(missingClassExcludes.stream(), violationsExcludes.stream())
                .filter(each -> missingClasses.contains(each) == false)
                .filter(each -> violationsClasses.contains(each) == false)

            entity.setUpdatedBy(username);
            entity.setUpdatedTime(currentTime);
            BeanUtil.copyBeanToBean(form, entity,
                    op -> op.exclude(Stream.concat(Stream.of(Constants.COMMON_CONVERSION_RULE), Stream.of(Constants.PERMISSIONS))
                            .toArray(n -> new String[n])));
            final PermissionHelper permissionHelper = ComponentUtil.getPermissionHelper();

                            }

                            @Override
                            public Stream<Phase> allPhases() {
                                return Stream.concat(
                                        Stream.of(this), phases().stream().flatMap(Lifecycle.Phase::allPhases));
                            }

                            @Override

            .filter(each -> unreleased.contains(each) == false)
            .collect(Collectors.toList());
    }

    public List<Version> getIndexCompatible() {
        var indexCompatibles = Stream.concat(
            groupByMajor.get(currentVersion.getMajor() - 1).stream(),
            groupByMajor.get(currentVersion.getMajor()).stream()
        ).collect(Collectors.toList());

Revenons un peu en arrière et comprenons de quoi il s'agit.

Le « flux » `password` est l'une des manières (« flows ») définies dans OAuth2 pour gérer la sécurité et l'authentification.

OAuth2 a été conçu pour que le backend ou l'API puisse être indépendant du serveur qui authentifie l'utilisateur.

Mais dans ce cas, la même application **FastAPI** gérera l'API et l'authentification.

Voyons cela selon ce point de vue simplifié :