* thrown by {@linkplain MoreExecutors#directExecutor direct execution}) will be caught and
   * logged.
   *
   * <p>Note: If your listener is lightweight -- and will not cause stack overflow by completing
   * more futures or adding more {@code directExecutor()} listeners inline -- consider {@link

   * which does not have an equivalent).
   */
  public ThreadFactoryBuilder() {}

  /**
   * Sets the naming format to use when naming threads ({@link Thread#setName}) which are created
   * with this ThreadFactory.
   *
   * <p><b>Java 21+ users:</b> use {@link Thread.Builder#name(String, long)} instead. Note that

   * reached, the proxy will attempt to abort the call to the target, and will throw an {@link
   * UncheckedTimeoutException} to the caller.
   *
   * <p>It is important to note that the primary purpose of the proxy object is to return control to
   * the caller when the timeout elapses; aborting the target method call is of secondary concern.

同时还传入一个作用域 `list`，此处仅包含一个作用域：`items`（也可以包含更多）。

依赖函数 `get_current_active_user` 也可以声明子依赖，不仅可以用 `Depends`，也可以用 `Security`。它声明了自己的子依赖函数（`get_current_user`），并添加了更多的作用域需求。

在这个例子里，它需要作用域 `me`（也可以需要多个作用域）。

/// note | 注意

不必在不同位置添加不同的作用域。

这里这样做，是为了演示 **FastAPI** 如何处理在不同层级声明的作用域。

///

{* ../../docs_src/security/tutorial005_an_py310.py hl[5,141,172] *}

/// info | 技术细节

app.add_middleware(UnicornMiddleware, some_config="rainbow")
```

`app.add_middleware()` 將中介軟體類別作為第一個引數，並接收要傳遞給該中介軟體的其他引數。

## 內建中介軟體 { #integrated-middlewares }

**FastAPI** 內建數個常見用途的中介軟體，以下將示範如何使用。

/// note | 技術細節

在接下來的範例中，你也可以使用 `from starlette.middleware.something import SomethingMiddleware`。

**FastAPI** 在 `fastapi.middleware` 中提供了一些中介軟體，純粹是為了方便你這位開發者。但大多數可用的中介軟體直接來自 Starlette。

///

 * to ensure thread isolation of bindings.</p>
 *
 * <p>Note on class-level isolation: Compiled Script classes are cached and reused.
 * Class-level state (static fields, metaclass mutations) persists across evaluations
 * of the same script. In Fess, scripts are short expressions configured by
 * administrators (e.g., "data1 &gt; 10", "10 * boost1 + boost2") and do not use
 * static state, so this is acceptable.</p>
 *

   * escaped.
   */
  private final boolean[] safeOctets;

  /**
   * Constructs a percent escaper with the specified safe characters and optional handling of the
   * space character.
   *
   * <p>Not that it is allowed, but not necessarily desirable to specify {@code %} as a safe
   * character. This has the effect of creating an escaper which has no well-defined inverse but it
   * can be useful when escaping additional characters.
   *

         * with everything else. If the below clause evaluates true
         * the andx command will not be written and therefore the
         * response will not read a batched command and therefore
         * the 'received' member of the response object will not
         * be set to true indicating the send and sendTransaction
         * methods that the next part should be sent. This is a

## 分步概括 { #recap-step-by-step }

### 步骤 1：导入 `FastAPI` { #step-1-import-fastapi }

{* ../../docs_src/first_steps/tutorial001_py310.py hl[1] *}

`FastAPI` 是一个为你的 API 提供了所有功能的 Python 类。

/// note | 技术细节

`FastAPI` 是直接从 `Starlette` 继承的类。

你可以通过 `FastAPI` 使用所有的 [Starlette](https://www.starlette.dev/) 的功能。

///

### 步骤 2：创建一个 `FastAPI`「实例」 { #step-2-create-a-fastapi-instance }

import org.apache.maven.model.validation.DefaultModelValidator;
import org.apache.maven.model.validation.ModelValidator;

/**
 * A factory to create model builder instances when no dependency injection is available. Note: This class is
 * only meant as a utility for developers that want to employ the model builder outside of the Maven build system, Maven