注意現在我們不再建立預設實例 `settings = Settings()`。

### 主應用程式檔案 { #the-main-app-file }

現在我們建立一個相依，回傳新的 `config.Settings()`。

{* ../../docs_src/settings/app02_an_py310/main.py hl[6,12:13] *}

/// tip

我們稍後會討論 `@lru_cache`。

現在你可以先把 `get_settings()` 視為一般函式。

///

接著我們可以在*路徑操作函式 (path operation function)* 中將它宣告為相依，並在需要的地方使用它。

{* ../../docs_src/settings/app02_an_py310/main.py hl[17,19:21] *}

你希望前端能用使用者名稱與密碼向後端進行身分驗證。

我們可以用 OAuth2 搭配 FastAPI 來實作。

但不必通讀整份冗長規格只為了找出你需要的幾個重點。

就用 FastAPI 提供的工具處理安全性。

## 看起來如何 { #how-it-looks }

先直接跑範例看效果，再回頭理解其原理。

## 建立 `main.py` { #create-main-py }

將範例複製到檔案 `main.py`：

{* ../../docs_src/security/tutorial001_an_py310.py *}

## 執行 { #run-it }

/// info

我们可以用 **OAuth2** 在 **FastAPI** 中实现它。

但为了节省你的时间，不必为获取少量信息而通读冗长的规范。

我们直接使用 **FastAPI** 提供的安全工具。

## 效果预览 { #how-it-looks }

先直接运行代码看看效果，之后再回过头理解其背后的原理。

## 创建 `main.py` { #create-main-py }

把下面的示例代码复制到 `main.py`：

{* ../../docs_src/security/tutorial001_an_py310.py *}

## 运行 { #run-it }

/// info | 信息

PROJECT_ROOT="${SCRIPT_DIR}"
while [[ ! -f "${PROJECT_ROOT}/pom.xml" ]] && [[ "${PROJECT_ROOT}" != "/" ]]; do
    PROJECT_ROOT="$(dirname "${PROJECT_ROOT}")"
done
GENERATE_THUMBNAIL="${PROJECT_ROOT}/src/main/assemblies/files/generate-thumbnail"
TEST_DIR="${SCRIPT_DIR}"
OUTPUT_DIR="/tmp/thumbnail_test_$$"

# Color codes for output
RED='\033[0;31m'
GREEN='\033[0;32m'
NC='\033[0m' # No Color

# Test counters

	  {
	    return new java.net.PasswordAuthentication( System.getenv( "MVNW_USERNAME" ), System.getenv( "MVNW_PASSWORD" ).toCharArray() );
	  }
	  public static void main( String[] args ) throws Exception
	  {
	    setDefault( new Downloader() );
	    java.nio.file.Files.copy( java.net.URI.create( args[0] ).toURL().openStream(), java.nio.file.Paths.get( args[1] ).toAbsolutePath().normalize() );

///

## Sub Applications { #sub-applications }

			return stmt, err
		}
	}

	// Validate table name
	err = validateTableName(selectAST.From)
	if err != nil {
		return stmt, err
	}

	// Analyze main select expression
	stmt.selectQProp = selectAST.Expression.analyze(&selectAST)
	err = stmt.selectQProp.err
	if err != nil {
		err = errQueryAnalysisFailure(err)
	}

	// Set table alias

[ # "10.0.0.0/8", # "192.168.0.0/24" # ] # ## Additional Annotations for the Kubernetes Job makePolicyJob makePolicyJob: securityContext: enabled: false runAsUser: 1000 runAsGroup: 1000 resources: requests: memory: 128Mi # Command to run after the main command on exit exitCommand: "" ## List of users to be created after minio install ## users: ## Username, password and policy to be assigned to the user ## Default policies are [readonly|readwrite|writeonly|consoleAdmin|diagnostics] ## Add new policies...

[ # "10.0.0.0/8", # "192.168.0.0/24" # ] # ## Additional Annotations for the Kubernetes Job makePolicyJob makePolicyJob: securityContext: enabled: false runAsUser: 1000 runAsGroup: 1000 resources: requests: memory: 128Mi # Command to run after the main command on exit exitCommand: "" ## List of users to be created after minio install ## users: ## Username, password and policy to be assigned to the user ## Default policies are [readonly|readwrite|writeonly|consoleAdmin|diagnostics] ## Add new policies...

"10.0.0.0/8", # "192.168.0.0/24" # ] # ## Additional Annotations for the Kubernetes Job makePolicyJob makePolicyJob: securityContext: enabled: false runAsUser: 1000 runAsGroup: 1000 fsGroup: 1000 resources: requests: memory: 128Mi # Command to run after the main command on exit exitCommand: "" ## List of users to be created after minio install ## users: ## Username, password and policy to be assigned to the user ## Default policies are [readonly|readwrite|writeonly|consoleAdmin|diagnostics] ## Add new policies...