new ValidateNegotiateInfoRequest(DEFAULT_CAPABILITIES, defaultClientGuid, DEFAULT_SECURITY_MODE, singleDialect);

        // Expected size: 24 (fixed) + 2 * 1
        assertEquals(26, request.size());
    }

    @Test
    @DisplayName("Test size calculation with empty dialects array")
    void testSizeWithEmptyDialects() {
        int[] emptyDialects = new int[0];

        bufferIndex += 4;

        // Write comment offset
        SMBUtil.writeInt4(26, buffer, bufferIndex);
        bufferIndex += 4;

        // Write comment
        byte[] commentBytes = comment.getBytes(StandardCharsets.US_ASCII);
        System.arraycopy(commentBytes, 0, buffer, 26, commentBytes.length);
        buffer[26 + commentBytes.length] = 0;

        response.readDataWireFormat(buffer, 0, buffer.length);

It will be generated only once, and then the same cached schema will be used for the next requests.

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[13:14,25:26] *}

### Override the method { #override-the-method }

Now you can replace the `.openapi()` method with your new function.

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[29] *}

    assertThat(url.encodedQuery).isEqualTo("a%2B%3D%26%20b=c%2B%3D%26%20d")
  }

  @Test
  fun composeQueryWithEncodedComponents() {
    val base = parse("http://host/")
    val url =
      base
        .newBuilder()
        .addEncodedQueryParameter("a+=& b", "c+=& d")
        .build()
    assertThat(url.toString()).isEqualTo("http://host/?a+%3D%26%20b=c+%3D%26%20d")

      if (alphaIndex < 26 && alphaIndex == getAlphaIndex(c2)) {
        continue;
      }
      return false;
    }
    return true;
  }

  /**
   * Returns the non-negative index value of the alpha character {@code c}, regardless of case. Ie,
   * 'a'/'A' returns 0 and 'z'/'Z' returns 25. Non-alpha characters return a value of 26 or greater.
   */

 */
object Punycode {
  val PREFIX_STRING = "xn--"
  val PREFIX = PREFIX_STRING.encodeUtf8()

  private const val BASE = 36
  private const val TMIN = 1
  private const val TMAX = 26
  private const val SKEW = 38
  private const val DAMP = 700
  private const val INITIAL_BIAS = 72
  private const val INITIAL_N = 0x80

  /**

And then **FastAPI** will call that override instead of the original dependency.

{* ../../docs_src/dependency_testing/tutorial001_an_py310.py hl[26:27,30] *}

/// tip

You can set a dependency override for a dependency used anywhere in your **FastAPI** application.

你可以把 `.openapi_schema` 屬性當作「快取」來儲存已產生的結構。

這樣使用者每次開啟 API 文件時，應用就不必重複產生結構。

結構只會產生一次，之後的請求都會使用相同的快取結果。

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[13:14,25:26] *}

### 覆寫方法 { #override-the-method }

現在你可以用新的函式取代 `.openapi()` 方法。

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[29] *}

### 檢查看看 { #check-it }

            if (i % 100 < 50) {
                data[i] = (byte) 'A';
            } else if (i % 100 < 75) {
                data[i] = (byte) 'B';
            } else {
                data[i] = (byte) (i % 26 + 'a');
            }
        }

        return data;
    }

## 라우터에서의 커스텀 `APIRoute` 클래스 { #custom-apiroute-class-in-a-router }

`APIRouter`의 `route_class` 파라미터를 설정할 수도 있습니다:

{* ../../docs_src/custom_request_and_route/tutorial003_py310.py hl[26] *}

이 예시에서는 `router` 아래의 *경로 처리*들이 커스텀 `TimedRoute` 클래스를 사용하며, 응답을 생성하는 데 걸린 시간을 담은 추가 `X-Response-Time` 헤더가 응답에 포함됩니다: