En fait, FastAPI utilise ces deux décorateurs en interne.

///

## Créer une dépendance de base de données avec `yield` { #a-database-dependency-with-yield }

Par exemple, vous pouvez l'utiliser pour créer une session de base de données et la fermer après la fin.

Seul le code précédant et incluant l'instruction `yield` est exécuté avant la création de la réponse :

{* ../../docs_src/dependencies/tutorial007_py310.py hl[2:4] *}

{"index":{"_index":"fess_config.scheduled_job","_id":"suggest_indexer"}}
{"name":"Suggest Indexer","target":"all","cronExpression":"0 12 * * *","scriptType":"groovy","scriptData":"return container.getComponent(\"suggestJob\").logLevel(\"info\").sessionId(\"SUGGEST\").execute(executor);","jobLogging":true,"crawler":false,"available":true,"sortOrder":2,"createdBy":"system","createdTime":0,"updatedBy":"system","updatedTime":0}

   -----------------------------------------------------------------------------------------------
   
   **1. Installing **TensorFlow-GPU** (TF) prebuilt binaries**
   
   
   Make sure you are using compatible TF and CUDA versions.
   Please refer following TF version and CUDA version compatibility table.
   
   | TF  | CUDA |
   
   | :-------------: | :-------------: |
   
   | 2.5.0  | 11.2 |
   
   | 2.4.0  | 11.0 |
   

In fact, FastAPI uses those two decorators internally.

///

## A database dependency with `yield` { #a-database-dependency-with-yield }

For example, you could use this to create a database session and close it after finishing.

Only the code prior to and including the `yield` statement is executed before creating a response:

{* ../../docs_src/dependencies/tutorial007_py310.py hl[2:4] *}

        this.b = b;
        this.off = off;
        this.dataLength = len;
        this.digest = null; /*
                             * otherwise recycled commands
                             * like writeandx will choke if session
                             * closes in between
                             */
    }

    /**
     * Sets the write mode flags for this request.
     *
     * @param writeMode

</div>

It will detect the files and tests automatically, execute them, and report the results back to you.

Run the tests with:

<div class="termy">

```console
$ pytest

================ test session starts ================
platform linux -- Python 3.6.9, pytest-5.3.5, py-1.8.1, pluggy-0.13.1
rootdir: /home/user/code/superawesome-cli/app
plugins: forked-1.1.3, xdist-1.31.0, cov-2.8.1
collected 6 items

---> 100%

</AssumeRoleWithCertificateResponse>
```

## Authentication Flow

A client can request temp. S3 credentials via the STS API. It can authenticate via a client certificate and obtain a access/secret key pair as well as a session token. These credentials are associated to an S3 policy at the MinIO server.

アプリケーションで *path operation* を宣言すると、**FastAPI** はOpenAPIスキーマに含めるために、その *path operation* に関連するメタデータを自動的に生成します。

/// note | 技術詳細

OpenAPI仕様では [Operation Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#operation-object) と呼ばれています。

///

これには *path operation* に関するすべての情報が含まれ、自動ドキュメントを生成するために使われます。

`tags`、`parameters`、`requestBody`、`responses` などが含まれます。

        if (cliRequest.getRootDirectory() != null) {
            props = new Properties();
            props.putAll(cliRequest.getUserProperties());
            props.put("session.rootDirectory", cliRequest.getRootDirectory().toString());
        }
        settingsRequest.setUserProperties(props);

        if (request.getEventSpyDispatcher() != null) {

```console
$ pip install pytest

---> 100%
```

</div>

它會自動偵測檔案與測試、執行它們，並把結果回報給你。

用以下指令執行測試：

<div class="termy">

```console
$ pytest

================ test session starts ================
platform linux -- Python 3.6.9, pytest-5.3.5, py-1.8.1, pluggy-0.13.1
rootdir: /home/user/code/superawesome-cli/app
plugins: forked-1.1.3, xdist-1.31.0, cov-2.8.1
collected 6 items

---> 100%