// according to the AWS S3 signature V4 spec.
func compareSignatureV4(sig1, sig2 string) bool {
	// The CTC using []byte(str) works because the hex encoding
	// is unique for a sequence of bytes. See also compareSignatureV2.
	return subtle.ConstantTimeCompare([]byte(sig1), []byte(sig2)) == 1
}

// doesPolicySignatureMatch - Verify query headers with post policy

The important thing to keep in mind is that the `sub` key should have a unique identifier across the entire application, and it should be a string.

## Check it { #check-it }

Run the server and go to the docs: [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs).

Vous pouvez facilement faire l'expérience en local avec un préfixe de chemin supprimé en utilisant [Traefik](https://docs.traefik.io/).

[Téléchargez Traefik](https://github.com/containous/traefik/releases) ; c'est un binaire unique, vous pouvez extraire le fichier compressé et l'exécuter directement depuis le terminal.

Créez ensuite un fichier `traefik.toml` avec :

```TOML hl_lines="3"
[entryPoints]
  [entryPoints.http]

この場合でも各 operation ID が**一意**であることは別の方法で保証する必要があります。

例えば、各 *path operation* にタグを付け、**タグ**と *path operation* の**名前**（関数名）から operation ID を生成できます。

### 一意 ID 生成関数のカスタマイズ { #custom-generate-unique-id-function }

FastAPI は各 *path operation* に**一意 ID**を用いており、これは **operation ID** のほか、必要に応じてリクエストやレスポンスのカスタムモデル名にも使われます。

この関数はカスタマイズ可能です。`APIRoute` を受け取り、文字列を返します。

	// Total object size.
	Size int64

	// Actual size is the real size of the object uploaded by client.
	ActualSize *int64

	// IsDir indicates if the object is prefix.
	IsDir bool

	// Hex encoded unique entity tag of the object.
	ETag string

	// Version ID of this object.
	VersionID string

	// IsLatest indicates if this is the latest current version
	// latest can be true for delete marker or a version.

credentials [here](https://github.com/minio/minio/blob/master/docs/kms/IAM.md).

> NOTE: if *path_prefix* is set then MinIO will not federate your buckets, namespaced IAM assets are assumed as isolated tenants, only buckets are considered globally unique but performing a lookup with a *bucket* which belongs to a different tenant will fail unlike federated setups where MinIO would port-forward and route the request to relevant cluster accordingly. This is a special feature, federated deployments should...

///

### Étape 5 : retourner le contenu { #step-5-return-the-content }

{* ../../docs_src/first_steps/tutorial001_py310.py hl[8] *}

Vous pouvez retourner un `dict`, une `list`, des valeurs uniques comme `str`, `int`, etc.

Vous pouvez également retourner des modèles Pydantic (vous en verrez plus à ce sujet plus tard).

            int threadCount = 20;
            ExecutorService executor = Executors.newFixedThreadPool(threadCount);
            CountDownLatch latch = new CountDownLatch(threadCount);

            // Each thread uses unique data to sign
            byte[][] results = new byte[threadCount][128];

            for (int t = 0; t < threadCount; t++) {
                final int threadId = t;
                executor.submit(() -> {

        }

        refresh();
    }

    /**
     * Generates a unique ID for a document based on session ID and URL.
     * Uses hashing for long IDs to ensure they fit within OpenSearch limits.
     *
     * @param sessionId The session ID.
     * @param url The URL.
     * @return The generated unique ID.
     */
    private String getId(final String sessionId, final String url) {

     */
    JavaPathType(JavaFileManager.Location location, String option) {
        this.location = location;
        this.option = option;
    }

    /**
     * Returns the unique name of this path type.
     *
     * @return the programmatic name of this enumeration value
     */
    @Override
    public String id() {
        return name();
    }

    /**