*       uppercase, hexadecimal representation of the byte value.
 * </ul>
 *
 * <p>For performance reasons the only currently supported character encoding of this class is
 * UTF-8.
 *
 * <p><b>Note:</b> This escaper produces <a
 * href="https://url.spec.whatwg.org/#percent-encode">uppercase</a> hexadecimal sequences.
 *
 * @author David Beaumont
 * @since 15.0
 */
@GwtCompatible

        }

        /*
         * if there is an andx and it itself is an andx then just recur by
         * calling this method for it. otherwise just read it's parameter words
         * and bytes as usual. Note how we can't just call andx.readWireFormat
         * because there's no header.
         */

        if (errorCode != 0 || andxCommand == (byte) 0xFF) {
            andxCommand = (byte) 0xFF;

<div class="termy">

```console
$ uvicorn main:app --host 0.0.0.0 --port 80

<span style="color: green;">INFO</span>:     Uvicorn running on http://0.0.0.0:80 (Press CTRL+C to quit)
```

</div>

/// note

指令 `uvicorn main:app` 指的是：

* `main`：檔案 `main.py`（Python「模組」）。
* `app`：在 `main.py` 中以 `app = FastAPI()` 建立的物件。

等同於：

```Python
from main import app
```

///

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

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

## 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 }

                }
            } catch (Exception e) {
                log.debug("Error releasing tree connection during emergency cleanup", e);
            }

            // Note: resourceLoc is final, cannot be set to null
            // Clear other mutable references would go here

        } catch (Exception e) {
            log.error("Failed to perform emergency tree handle cleanup", e);

   *
   * {@snippet :
   *    a     b
   *   / \   / \
   *  /   \ /   \
   * c     d     e
   *        \   /
   *         \ /
   *          f
   * }
   *
   * <p><b>Note on binary trees</b>
   *
   * <p>This method can be used to traverse over a binary tree. Given methods {@code
   * leftChild(node)} and {@code rightChild(node)}, this method can be called as
   *
   * {@snippet :

 * equals}, {@code hashCode} and {@code compareTo} because instances are expected to be mutated, and
 * so are not useful as collection keys.
 *
 * <p>jsr166e note: This class is targeted to be placed in java.util.concurrent.atomic.
 *
 * @since 1.8
 * @author Doug Lea
 */
final class LongAdder extends Striped64 implements Serializable, LongAddable {

/**
 * Implementation of FarmHash Fingerprint64, an open-source fingerprinting algorithm for strings.
 *
 * <p>Its speed is comparable to CityHash64, and its quality of hashing is at least as good.
 *
 * <p>Note to maintainers: This implementation relies on signed arithmetic being bit-wise equivalent
 * to unsigned arithmetic in all cases except:
 *
 * <ul>
 *   <li>comparisons (signed values can be negative)