# CORS (Cross-Origin Resource Sharing) { #cors-cross-origin-resource-sharing }

<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS" class="external-link" target="_blank">CORS or "Cross-Origin Resource Sharing"</a> refers to the situations when a frontend running in a browser has JavaScript code that communicates with a backend, and the backend is in a different "origin" than the frontend.

## Origin { #origin }

ECL0094=IllegalArgumentException occurred when value({7}) of class {5}[{6}] is set to {2}[{3}] field({4}) of class({0})[{1}]. Target class is ({8})[{9}].
ECL0097=Value({1}) of property({0}) can not be converted. because {2}.
ECL0098=Exception occurred when value({7}) of class{5}[{6}] is set to {2}[{3}] property({4}) of class({0})[{1}]. Target class is ({8})[{9}].
ECL0099=Field({1}) of class({0}) is not a static field.

By default, **FastAPI** would automatically convert that return value to JSON using the `jsonable_encoder` explained in [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

Then, behind the scenes, it would put that JSON-compatible data (e.g. a `dict`) inside of a `JSONResponse` that would be used to send the response to the client.

Aber in realen Fällen würden Sie bei der Implementierung von Sicherheit mehr Vorteile durch die Verwendung der integrierten [Sicherheits-Werkzeuge (siehe nächstes Kapitel)](../security/index.md){.internal-link target=_blank} erzielen.

///

## Abhängigkeitsfehler und -Rückgabewerte

Sie können dieselben Abhängigkeits-*Funktionen* verwenden, die Sie normalerweise verwenden.

### Abhängigkeitsanforderungen

     */
    public CommandChain() {
        // Default constructor
    }

    /**
     * Checks if the given username is a target user for command execution.
     * @param username The username to check.
     * @return True if the user is a target user, false otherwise.
     */
    protected boolean isTargetUser(final String username) {
        if (targetUsers == null) {
            return true;

        Type2Message type2 = new Type2Message(createMockContext(), flags, challenge, "TARGET");

        // Create target information with timestamp for NTLMv2
        List<AvPair> pairs = new LinkedList<>();
        pairs.add(new AvTargetName("TARGET"));
        pairs.add(new AvTimestamp(System.currentTimeMillis()));
        pairs.add(new AvFlags(0));

	return "Destination bucket does not exist: " + e.Bucket
}

// BucketRemoteTargetNotFound remote target does not exist.
type BucketRemoteTargetNotFound GenericError

func (e BucketRemoteTargetNotFound) Error() string {
	return "Remote target not found: " + e.Bucket
}

// RemoteTargetConnectionErr remote target connection failure.
type RemoteTargetConnectionErr struct {
	Err       error
	Bucket    string

///

`status_code` 🔢 📨 🔢 ⏮️ 🇺🇸🔍 👔 📟.

/// info

`status_code` 💪 👐 📨 `IntEnum`, ✅ 🐍 <a href="https://docs.python.org/3/library/http.html#http.HTTPStatus" class="external-link" target="_blank">`http.HTTPStatus`</a>.

///

⚫️ 🔜:

* 📨 👈 👔 📟 📨.
* 📄 ⚫️ ✅ 🗄 🔗 ( &amp; , 👩‍💻 🔢):

<img src="/img/tutorial/response-status-code/image01.png">

/// note

Par défaut, **FastAPI** convertirait automatiquement cette valeur de retour en JSON en utilisant le `jsonable_encoder` expliqué dans [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

Ensuite, en arrière-plan, il mettra ces données JSON-compatible (par exemple un `dict`) à l'intérieur d'un `JSONResponse` qui sera utilisé pour envoyer la réponse au client.

   * up, any time callers spend waiting for a thread may count toward their time limit, and in this
   * case the call may even time out before the target method is ever invoked.
   *
   * @param executor the ExecutorService that will execute the method calls on the target objects;
   *     for example, a {@link Executors#newCachedThreadPool()}.
   * @since 22.0
   */
  public static SimpleTimeLimiter create(ExecutorService executor) {