在这两种情况下，与您之前的框架相比，**FastAPI** 可能[仍然很快](index.md#_11){.internal-link target=_blank}。

### 依赖

这同样适用于[依赖](tutorial/dependencies/index.md){.internal-link target=_blank}。如果一个依赖是标准的 `def` 函数而不是 `async def`，它将被运行在外部线程池中。

### 子依赖

你可以拥有多个相互依赖的依赖以及[子依赖](tutorial/dependencies/sub-dependencies.md){.internal-link target=_blank} （作为函数的参数），它们中的一些可能是通过 `async def` 声明，也可能是通过 `def` 声明。它们仍然可以正常工作，这些通过 `def` 声明的函数将会在外部线程中调用（来自线程池），而不是"被等待"。

                modelRequest.setTwoPhaseBuilding(false);
                // This merge is on purpose because otherwise user properties would override model
                // properties in dependencies the user does not know. See MNG-7563 for details.
                modelRequest.setSystemProperties(
                        toProperties(session.getUserProperties(), session.getSystemProperties()));

    public static final String MAVEN_REPO_LOCAL_RECORD_REVERSE_TREE = "maven.repo.local.recordReverseTree";

    /**
     * User property for selecting dependency manager behaviour regarding transitive dependencies and dependency
     * management entries in their POMs. Maven 3 targeted full backward compatibility with Maven2, hence it ignored

The benefit of raising an exception over `return`ing a value will be more evident in the section about Dependencies and Security.

In this example, when the client requests an item by an ID that doesn't exist, raise an exception with a status code of `404`:

```Python hl_lines="11"
{!../../docs_src/handling_errors/tutorial001.py!}

    - [Node binaries](#node-binaries)
  - [Changelog since v1.16.14](#changelog-since-v11614)
  - [Changes by Kind](#changes-by-kind)
    - [Bug or Regression](#bug-or-regression)
  - [Dependencies](#dependencies)
    - [Added](#added)
    - [Changed](#changed)
    - [Removed](#removed)
- [v1.16.14](#v11614)
  - [Downloads for v1.16.14](#downloads-for-v11614)
    - [Source Code](#source-code-1)

                    .longOpt("ignore-transitive-repositories")
                    .desc("If set, Maven will ignore remote repositories introduced by transitive dependencies.")
                    .build());
        }
    }

    val tomlj = "org.tomlj:tomlj"
    val trove4j = "org.jetbrains.intellij.deps:trove4j"
    val xbeanReflect = "org.apache.xbean:xbean-reflect"
    val xmlApis = "xml-apis:xml-apis"

    // Compile only dependencies (dynamically downloaded if needed)
    val maven3Compat = "org.apache.maven:maven-compat"
    val maven3PluginApi = "org.apache.maven:maven-plugin-api"
    val zinc = "org.scala-sbt:zinc_2.13"

    }

    fun asName(): String =
        "${testType.name.toCapitalized()} ${testJvmVersion.name.toCapitalized()} ${vendor.displayName} ${os.asName()} ${arch.asName()}${if (withoutDependencies) " without dependencies" else ""}"
}

enum class TestType(val unitTests: Boolean = true, val functionalTests: Boolean = true, val crossVersionTests: Boolean = false, val timeout: Int = 180, val maxParallelForks: Int = 4) {

        options.addOption(Option.builder(IGNORE_TRANSITIVE_REPOSITORIES)
                .longOpt("ignore-transitive-repositories")
                .desc("If set, Maven will ignore remote repositories introduced by transitive dependencies.")
                .build());

        // Parameters handled by script
        options.addOption(Option.builder()
                .longOpt(DEBUG)

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="4 7  13-15  29-31  79-87"
{!> ../../docs_src/security/tutorial004.py!}
```

////

## Update the dependencies

Update `get_current_user` to receive the same token as before, but this time, using JWT tokens.

Decode the received token, verify it, and return the current user.