## Handlers & Routes

Handlers have a predefined Handler ID. 
In addition, there can be several *static* subroutes used to differentiate between different handlers of the same ID.
A subroute on a client must match a subroute on the server. So routes cannot be used for dynamic routing, unlike HTTP.

!!! note "Hinweis"
    Es ist üblich, dass jeder Authentifizierungsanbieter seine Flows anders benennt, um sie zu einem Teil seiner Marke zu machen.

    Aber am Ende implementieren sie denselben OAuth2-Standard.

**FastAPI** enthält Werkzeuge für alle diese OAuth2-Authentifizierungs-Flows in `fastapi.security.oauth2`.

Harshavardhana <******@****.***> 1714525796 -0700

Anis Eleuch <******@****.***> 1712232280 +0100

## Override the default exception handlers

**FastAPI** has some default exception handlers.

These handlers are in charge of returning the default JSON responses when you `raise` an `HTTPException` and when the request has invalid data.

You can override these exception handlers with your own.

### Override request validation exceptions

	if err != nil {
		return "", "", err
	}
	return handlers.InferPodInfoFromTypedResource(name, i.NamespaceOrDefault(namespace), MakeKubeFactory(client))
}

func (i *instance) InferPodsFromTypedResource(name, namespace string) ([]string, string, error) {
	client, err := i.CLIClient()
	if err != nil {
		return nil, "", err
	}

	}
	if h.Subroute == "" {
		if m.handlers.hasAny(id) && !id.isTestHandler() {
			return ErrHandlerAlreadyExists
		}
		m.handlers.streams[id] = &h
		return nil
	}
	subID := makeSubHandlerID(id, h.Subroute)
	if m.handlers.hasSubhandler(subID) && !id.isTestHandler() {
		return ErrHandlerAlreadyExists
	}
	m.handlers.subStreams[subID] = &h

}

type CniPluginServer struct {
	cniListenServer       *http.Server
	cniListenServerCancel context.CancelFunc
	handlers              K8sHandlers
	dataplane             MeshDataplane

	sockAddress string
	ctx         context.Context
}

func startCniPluginServer(ctx context.Context, pluginSocket string,
	handlers K8sHandlers,
	dataplane MeshDataplane,
) *CniPluginServer {
	ctx, cancel := context.WithCancel(ctx)

Aditya Manthramurthy <******@****.***> 1693857457 -0700

		ctx,
		pod,
		util.GetPodIPsIfPresent(pod),
		"",
	).Return(nil)

	server := &meshDataplane{
		kubeClient: client.Kube(),
		netServer:  fs,
	}

	handlers := setupHandlers(ctx, client, server, "istio-system")
	client.RunAndWait(ctx.Done())
	go handlers.Start()

	// label the namespace
	labelsPatch := []byte(fmt.Sprintf(`{"metadata":{"labels":{"%s":"%s"}}}`,
		constants.DataplaneModeLabel, constants.DataplaneModeAmbient))