assertEquals("adaptive", config.getLoadBalancingStrategy(), "Default strategy should be adaptive");
        assertEquals(10, config.getChannelHealthCheckInterval(), "Default health check interval should be 10");
    }

    @Test
    void testMultiChannelEnabledProperty() throws CIFSException {
        Properties props = new Properties();

{* ../../docs_src/path_operation_configuration/tutorial005_py310.py hl[18] *}

/// info | 정보

`response_description`은 구체적으로 응답을 지칭하며, `description`은 일반적인 *경로 처리*를 지칭합니다.

///

/// check | 확인

OpenAPI는 각 *경로 처리*가 응답에 관한 설명을 요구할 것을 명시합니다.

따라서, 응답에 관한 설명을 제공하지 않으면, **FastAPI**가 "Successful response" 중 하나를 자동으로 생성합니다.

///

<img src="/img/tutorial/path-operation-configuration/image03.png">

* `limit=10`：因為那是預設值

## 選用參數 { #optional-parameters }

同樣地，你可以將預設值設為 `None` 來宣告選用的查詢參數：

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

在這種情況下，函式參數 `q` 為選用，且預設為 `None`。

/// check | 注意

另外請注意，FastAPI 能辨識出路徑參數 `item_id` 是路徑參數，而 `q` 不是，因此 `q` 會被當作查詢參數。

///

## 查詢參數型別轉換 { #query-parameter-type-conversion }

你也可以宣告 `bool` 型別，值會被自動轉換：

        # shellcheck disable=SC2039,SC3045
        MAX_FD=$( ulimit -H -n ) ||
            warn "Could not query maximum file descriptor limit"
    esac
    case $MAX_FD in  #(
      '' | soft) :;; #(
      *)
        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045

            for (int i = 0; i < KerberosConstants.CHECKSUM_SIZE; i++) {
                if (plainDataChecksum[i] != data[i]) {
                    throw new GeneralSecurityException("Checksum failed while decrypting.");
                }
            }
        }

        int decryptLength = plainData.length - KerberosConstants.CONFOUNDER_SIZE;
        decrypt = new byte[decryptLength];

  }

  @Override
  public Set<E> edgesConnecting(N nodeU, N nodeV) {
    NetworkConnections<N, E> connectionsU = checkedConnections(nodeU);
    if (!allowsSelfLoops && nodeU == nodeV) { // just an optimization, only check reference equality
      return ImmutableSet.of();
    }
    checkArgument(containsNode(nodeV), NODE_NOT_IN_GRAPH, nodeV);
    return nodePairInvalidatableSet(connectionsU.edgesConnecting(nodeV), nodeU, nodeV);
  }

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

Dans ce cas, le paramètre de fonction `q` sera optionnel et vaudra `None` par défaut.

/// check | Vérifications

Notez également que **FastAPI** est suffisamment intelligent pour remarquer que le paramètre de chemin `item_id` est un paramètre de chemin et que `q` ne l'est pas, c'est donc un paramètre de requête.

///

Quando você tentar abrir a URL pela primeira vez (ou clicar no botão "Executar" na documentação) o navegador vai pedir pelo seu usuário e senha:

<img src="/img/tutorial/security/image12.png">

## Verifique o usuário { #check-the-username }

Aqui está um exemplo mais completo.

Utilize uma dependência para verificar se o usuário e a senha estão corretos.

func stripStandardPorts(apiEndpoints []string, host string) (newAPIEndpoints []string) {
	if len(apiEndpoints) == 1 {
		return apiEndpoints
	}
	newAPIEndpoints = make([]string, len(apiEndpoints))
	// Check all API endpoints for standard ports and strip them.
	for i, apiEndpoint := range apiEndpoints {
		_, err := xnet.ParseHTTPURL(apiEndpoint)
		if err != nil {
			continue
		}
		u, err := url.Parse(apiEndpoint)

	// https://github.com/golang/go/issues/29246
	// if tlsConfig != nil {
	// 	trhttp2, _ := http2.ConfigureTransports(tr)
	// 	if trhttp2 != nil {
	// 		// ReadIdleTimeout is the timeout after which a health check using ping
	// 		// frame will be carried out if no frame is received on the
	// 		// connection. 5 minutes is sufficient time for any idle connection.
	// 		trhttp2.ReadIdleTimeout = 5 * time.Minute