But in this case, the same **FastAPI** application will handle the API and the authentication.

So, let's review it from that simplified point of view:

* The user types the `username` and `password` in the frontend, and hits `Enter`.
* The frontend (running in the user's browser) sends that `username` and `password` to a specific URL in our API (declared with `tokenUrl="token"`).

    assertThat(applicationInterceptor.level).isEqualTo(Level.NONE)
    for (level in Level.entries) {
      applicationInterceptor.setLevel(level)
      assertThat(applicationInterceptor.level).isEqualTo(level)
    }
  }

  @Test
  fun setLevelShouldReturnSameInstanceOfInterceptor() {
    for (level in Level.entries) {
      assertThat(applicationInterceptor.setLevel(level)).isSameInstanceAs(applicationInterceptor)

		bucket:         bucketName,
		recursive:      true,
		forwardTo:      "",
		minDisks:       listingQuorum,
		reportNotFound: false,
		agreed:         fn,
		partial: func(entries metaCacheEntries, _ []error) {
			entry, ok := entries.resolve(&resolver)
			if ok {
				fn(*entry)
			}
		},
		finished: nil,
	})
	return err
}

// rebalanceBucket rebalances objects under bucket in poolIdx pool

		// position if this is not correct we discard the disk
		// and move to collect others
		if distribution[i] != meta.Erasure.Index {
			inconsistent++ // keep track of inconsistent entries
			continue
		}
		shuffledDisks[meta.Erasure.Index-1] = disks[i]
		shuffledPartsMetadata[meta.Erasure.Index-1] = metaArr[i]
	}

	// Inconsistent meta info is with in the limit of

./mc ls -r --versions minio2/newbucket >/tmp/minio2.txt

out=$(diff -qpruN /tmp/minio1.txt /tmp/minio2.txt)
ret=$?
if [ $ret -ne 0 ]; then
	echo "BUG: expected no missing entries after replication resync: $out"
	exit 1
fi

   * {@code NavigableMap}. In many cases, you may wish to override {@link
   * ForwardingNavigableMap#descendingMap} to forward to this implementation or a subclass thereof.
   *
   * <p>In particular, this map iterates over entries with repeated calls to {@link
   * NavigableMap#lowerEntry}. If a more efficient means of iteration is available, you may wish to
   * override the {@code entryIterator()} method of this class.
   *
   * @since 12.0

   * {@code NavigableMap}. In many cases, you may wish to override {@link
   * ForwardingNavigableMap#descendingMap} to forward to this implementation or a subclass thereof.
   *
   * <p>In particular, this map iterates over entries with repeated calls to {@link
   * NavigableMap#lowerEntry}. If a more efficient means of iteration is available, you may wish to
   * override the {@code entryIterator()} method of this class.
   *
   * @since 12.0

        Smb2IoctlResponse resp = new Smb2IoctlResponse(config);

        int read = resp.decode(packet, 0);
        assertTrue(read >= packet.length, "Decoded length should cover entire packet");
        assertNotNull(resp.getErrorData(), "Error data should be decoded");
        assertEquals(3, resp.getErrorData().length);
        assertEquals(2, resp.getErrorContextCount());

	count, err := strconv.Atoi(params.Get(storageRESTCount))
	if err != nil {
		return grid.NewRemoteErr(err)
	}

	entries, err := s.getStorage().ListDir(ctx, origvolume, volume, dirPath, count)
	if err != nil {
		return grid.NewRemoteErr(err)
	}
	out <- &ListDirResult{Entries: entries}
	return nil
}

// DeleteFileHandler - delete a file.

Но в нашем случае одно и то же приложение **FastAPI** будет работать и с API, и с аутентификацией.

Итак, рассмотрим это с упрощенной точки зрения:

* Пользователь вводит на фронтенде `username` и `password` и нажимает `Enter`.
* Фронтенд (работающий в браузере пользователя) отправляет эти `username` и `password` на конкретный URL в нашем API (объявленный с `tokenUrl="token"`).