Wenn Sie eine FastAPI-Anwendung verwenden und ein Serverprogramm wie Uvicorn verwenden, kann **ein einzelner Prozess** mehrere Clients gleichzeitig bedienen.

In vielen Fällen möchten Sie jedoch mehrere Prozesse gleichzeitig ausführen.

### Mehrere Prozesse – Worker

* los datos de cliente que se envían a través de la red
* los datos enviados por tu programa para ser recibidos por el cliente a través de la red
* el contenido de un archivo en disco para ser leído por el sistema y entregado al programa

Now we create a `HeroCreate` model, this is the one that will **validate** the data from the clients.

It has the same fields as `HeroBase`, and it also has `secret_name`.

Now, when the clients **create a new hero**, they will send the `secret_name`, it will be stored in the database, but those secret names won't be returned in the API to the clients.

/// tip

		},
		Extensions: make(map[string]string),
	}, nil
}

func validateKey(c ssh.ConnMetadata, clientKey ssh.PublicKey) (err error) {
	if caPublicKey == nil {
		return errors.New("public key authority validation requested but no ca public key specified.")
	}

	cert, ok := clientKey.(*ssh.Certificate)
	if !ok {
		return errSftpPublicKeyWithoutCert
	}

///

Damit können Sie den WebSocket verbinden und dann Nachrichten senden und empfangen:

<img src="/img/tutorial/websockets/image05.png">

## Verbindungsabbrüche und mehreren Clients handhaben

Wenn eine WebSocket-Verbindung geschlossen wird, löst `await websocket.receive_text()` eine `WebSocketDisconnect`-Exception aus, die Sie dann wie in folgendem Beispiel abfangen und behandeln können.

	OpConnect Op = iota + 1

	// OpConnectResponse is a response to a connect request.
	OpConnectResponse

	// OpPing is a ping request.
	// If a mux id is specified that mux is pinged.
	// Clients send ping requests.
	OpPing

	// OpPong is a OpPing response returned by the server.
	OpPong

	// OpConnectMux will connect a new mux with optional payload.
	OpConnectMux

///

```Python hl_lines="11"
{!> ../../docs_src/query_param_models/tutorial002.py!}
```

////

Caso um cliente tente enviar alguns dados **extras** nos **parâmetros de consulta**, eles receberão um retorno de **erro**.

Por exemplo, se o cliente tentar enviar um parâmetro de consulta `tool` com o valor `plumbus`, como:

```http
https://example.com/items/?limit=10&tool=plumbus
```

  //
  // WARNING: The destructor of this class is marked as protected to disallow
  // clients from directly destroying this object since it may manage it's own
  // lifetime through ref counting. Thus this must be allocated on the heap and
  // clients MUST call Release() in order to destroy an instance of this class.
  virtual void Release() = 0;

With a FastAPI application, using a server program like the `fastapi` command that runs Uvicorn, running it once in **one process** can serve multiple clients concurrently.

But in many cases, you will want to run several worker processes at the same time.

### Multiple Processes - Workers

import org.eclipse.aether.util.graph.manager.ClassicDependencyManager;

/**
 * A utility class to assist in setting up a Maven-like repository system. Note: This component is meant to
 * assist those clients that employ the repository system outside of an IoC container, Maven plugins should instead
 * always use regular dependency injection to acquire the repository system.
 *
 * @deprecated See {@link MavenSessionBuilderSupplier}