トークンが存在するかどうかをチェックしてエラーを返す必要はありません。関数が実行された場合、そのトークンに`str`が含まれているか確認できます。

インタラクティブなドキュメントですでに試すことができます:

<img src="/img/tutorial/security/image03.png">

まだトークンの有効性を検証しているわけではありませんが、これはもう始まっています。

## まとめ

```

////

//// tab | Python 3.8+

In Versionen unter Python 3.9 importieren Sie `Annotated` von `typing_extensions`.

Es wird bereits mit FastAPI installiert sein.

```Python hl_lines="3-4"
{!> ../../docs_src/query_params_str_validations/tutorial002_an.py!}
```

////

/// info

FastAPI unterstützt (und empfiehlt die Verwendung von) `Annotated` seit Version 0.95.0.

            }
            int b;
            if ((b = in.read()) == -1) {
                return null;
            }
            sbuf[35] = (byte) b;
        }

        key.mid = Encdec.dec_uint16le(sbuf, 34) & 0xFFFF;

        /* Unless key returned is null or invalid Transport.loop() always
         * calls doRecv() after and no one else but the transport thread

    assertEquals(
        MediaType.parse("text/plain; a=1; a=2; b=3; b=4"),
        MediaType.parse("text/plain; a=1; a=2").withParameters("b", ImmutableSet.of("3", "4")));
  }

  public void testWithParametersIterable_invalidAttribute() {
    MediaType mediaType = MediaType.parse("text/plain");
    assertThrows(

        void shouldDecodeBufferWithOffset() throws SMBProtocolDecodingException {
            // Given - buffer with padding before actual data
            ByteBuffer buffer = ByteBuffer.allocate(34);
            buffer.order(ByteOrder.LITTLE_ENDIAN);
            buffer.position(10); // Add 10 bytes of padding
            buffer.putLong(2048L);
            buffer.putLong(1024L);
            buffer.putInt(4);

				},
				{
					Object:   objectNames[4],
					UploadID: uploadIDs[8],
				},
				{
					Object:   objectNames[5],
					UploadID: uploadIDs[9],
				},
			},
		},
		// listMultipartResults - 34.
		// checking listing with `KeyMarker` set.
		{
			MaxUploads:  10,
			IsTruncated: false,
			KeyMarker:   objectNames[3],
			Uploads: []MultipartInfo{
				{
					Object:   objectNames[4],

```

////

//// tab | Python 3.8+

En versiones de Python por debajo de 3.9 importas `Annotated` desde `typing_extensions`.

Ya estará instalado con FastAPI.

```Python hl_lines="3-4"
{!> ../../docs_src/query_params_str_validations/tutorial002_an.py!}
```

////

/// info | Información

FastAPI añadió soporte para `Annotated` (y empezó a recomendarlo) en la versión 0.95.0.

  }

  public void testSetConcurrencyLevel() {
    // round up to the nearest power of two

    checkConcurrencyLevel(1, 1);
    checkConcurrencyLevel(2, 2);
    checkConcurrencyLevel(3, 4);
    checkConcurrencyLevel(4, 4);
    checkConcurrencyLevel(5, 8);
    checkConcurrencyLevel(6, 8);
    checkConcurrencyLevel(7, 8);
    checkConcurrencyLevel(8, 8);
  }

  }

  public void testSetConcurrencyLevel() {
    // round up to the nearest power of two

    checkConcurrencyLevel(1, 1);
    checkConcurrencyLevel(2, 2);
    checkConcurrencyLevel(3, 4);
    checkConcurrencyLevel(4, 4);
    checkConcurrencyLevel(5, 8);
    checkConcurrencyLevel(6, 8);
    checkConcurrencyLevel(7, 8);
    checkConcurrencyLevel(8, 8);
  }

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