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### OpenAPI

**FastAPI** 使用定義 API 的 **OpenAPI** 標準來生成一個 「schema」 與你的所有 API。

#### 「Schema」

「schema」是對某個事物的定義或描述。它並不是實作它的程式碼，而僅僅是一個抽象的描述。

#### API 「schema」

    assertThat(iia1.subArray(1, 1)).isSameInstanceAs(ImmutableDoubleArray.of());
    assertThat(iia1.subArray(0, 1).asList()).containsExactly(5.0);
    assertThat(iia3.subArray(0, 2).asList()).containsExactly(5.0, 25.0).inOrder();
    assertThat(iia3.subArray(1, 3).asList()).containsExactly(25.0, 125.0).inOrder();

    assertThrows(IndexOutOfBoundsException.class, () -> iia3.subArray(-1, 1));

  @Test
  fun characterEncoding() {
    // Browsers convert '\u0000' to '%EF%BF%BD'.
    assertThat(formEncode(0)).isEqualTo("%00")
    assertThat(formEncode(1)).isEqualTo("%01")
    assertThat(formEncode(2)).isEqualTo("%02")
    assertThat(formEncode(3)).isEqualTo("%03")
    assertThat(formEncode(4)).isEqualTo("%04")
    assertThat(formEncode(5)).isEqualTo("%05")
    assertThat(formEncode(6)).isEqualTo("%06")

    String[] empty = ObjectArrays.newArray(in, 0);
    assertThat(empty).isEmpty();
  }

  public void testNewArray_fromArray_nonempty() {
    String[] array = ObjectArrays.newArray(new String[0], 2);
    assertEquals(String[].class, array.getClass());
    assertThat(array).hasLength(2);
    assertNull(array[0]);
  }

  public void testNewArray_fromArray_ofArray() {

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## Actualización del Ejemplo

Ahora modifica el archivo `main.py` para recibir un body desde un request `PUT`.

Declara el body usando tipos estándar de Python, gracias a Pydantic.

Je ziet de automatische interactieve API documentatie (verstrekt door <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank">ReDoc</a>):

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## Voorbeeld upgrade

Pas nu het bestand `main.py` aan om de body van een `PUT` request te ontvangen.

Dankzij Pydantic kunnen we de body declareren met standaard Python types.

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## Evoluindo o Exemplo

Agora modifique o arquivo `main.py` para receber um corpo para uma requisição `PUT`.

Declare o corpo utilizando tipos padrão Python, graças ao Pydantic.

  }

  public void testWriteBytesToUndersizedArrayShortMaxLength() {
    byte[] dest = new byte[3];
    HASH_ABCD.writeBytesTo(dest, 0, 2);
    assertTrue(Arrays.equals(new byte[] {(byte) 0xaa, (byte) 0xbb, (byte) 0x00}, dest));
  }

  private static ClassSanityTester.FactoryMethodReturnValueTester sanityTester() {
    return new ClassSanityTester()

            }
            return null;
        }).when(cache).resolveSids0(any(), any(), any());

        // Resolve first two entries
        cache.resolveSids(ctx, null, arr, 0, 2);

        // Verify resolveSids0 called exactly once with the two SIDs needing resolution
        ArgumentCaptor<SID[]> captor = ArgumentCaptor.forClass(SID[].class);

        void shouldReturnZeroWhenStreamEmpty() throws IOException {
            InputStream is = new ByteArrayInputStream("Hi".getBytes());
            byte[] buffer = new byte[10];

            Transport.readn(is, buffer, 0, 2); // Read all
            int bytesRead = Transport.readn(is, buffer, 0, 5); // Try to read more
            assertEquals(0, bytesRead);
        }
    }

    @Nested
    @DisplayName("Resource management tests")