Para entender mais sobre isso, veja a seção [Comparações](https://fastapi.tiangolo.com/pt/benchmarks/).

## Dependências { #dependencies }

O FastAPI depende do Pydantic e do Starlette.

### Dependências `standard` { #standard-dependencies }

Quando você instala o FastAPI com `pip install "fastapi[standard]"`, ele vem com o grupo `standard` de dependências opcionais:

Utilizado pelo Pydantic:

        if (dependencies == null) {
            throw new GradleException("No dependencies variable defined.");
        }

        if (dependencies.isEmpty()) {
            if (licensesDir.exists()) {
                throw new GradleException("Licenses dir " + licensesDir + " exists, but there are no dependencies");
            }
            return; // no dependencies to check

* 它們都會包含預先定義的 `responses`。
* 這些路徑操作都會在執行前評估 / 執行其 `dependencies` 清單。
    * 如果你也在特定的路徑操作中宣告了相依性，這些相依性也會被執行。
    * Router 的相依性會先執行，然後是[裝飾器中的 `dependencies`](dependencies/dependencies-in-path-operation-decorators.md)，最後是一般參數相依性。
    * 你也可以加入帶有 `scopes` 的 [`Security` 相依性](../advanced/security/oauth2-scopes.md)。

/// tip | 提示

在 `APIRouter` 中設定 `dependencies`，例如可以用來對一整組路徑操作要求驗證。即使沒有在每個路徑操作個別加入相依性也沒關係。

///

                }
            }
        }

        dependencies {
            if (!stage.runsIndependent && prevStage != null) {
                dependOnPreviousStageTrigger(model, prevStage, os)
            }

            snapshotDependencies(dependencies)
        }
    })

fun Dependencies.dependOnPreviousStageTrigger(
    model: CIBuildModel,
    prevStage: Stage,

Тож помістимо їх у власний модуль `dependencies` (`app/dependencies.py`).

Тепер використаємо просту залежність для читання користувацького заголовка `X-Token`:

{* ../../docs_src/bigger_applications/app_an_py310/dependencies.py hl[3,6:8] title["app/dependencies.py"] *}

/// tip | Порада

Ми використовуємо вигаданий заголовок, щоб спростити приклад.

         */
        List<Dependency> dependencies = model.getDependencies();
        Map<String, Dependency> normalized = new LinkedHashMap<>(dependencies.size() * 2);

        for (Dependency dependency : dependencies) {
            normalized.put(dependency.getManagementKey(), dependency);
        }

        if (dependencies.size() != normalized.size()) {

        if (dependencyManagement != null) {
            Element dependencies = dependencyManagement.child(DEPENDENCIES).orElse(null);
            if (dependencies != null) {
                hasChanges |=
                        removeManagedDependenciesFromSection(context, dependencies, allGAVs, DEPENDENCY_MANAGEMENT);
            }
        }

        // Check profiles for dependencyManagement

        assertViolations(result, 0, 2, 0);

        assertContains(
                result.getErrors().get(0), "'dependencies.dependency.version' for test:b:jar must be a valid version");
        assertContains(
                result.getErrors().get(1),
                "'dependencies.dependency.version' for test:c:jar must not contain any of these characters");
    }

    @Test

  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.squareup.okhttp3</groupId>
        <artifactId>okhttp-bom</artifactId>
        <version>[5.2.0-SNAPSHOT,6.0.0-SNAPSHOT)</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>

  </scm>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>maven-test</groupId>
        <artifactId>t05-b</artifactId>
        <version>1.0</version>
      </dependency>
      <dependency>
        <groupId>maven-test</groupId>
        <artifactId>t05-d</artifactId>
        <version>1.0</version>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>