También podrías usar `from starlette.websockets import WebSocket`.

**FastAPI** proporciona el mismo `WebSocket` directamente solo como una conveniencia para ti, el desarrollador. Pero viene directamente de Starlette.

///

## Esperar mensajes y enviar mensajes { #await-for-messages-and-send-messages }

En tu ruta de WebSocket puedes `await` para recibir mensajes y enviar mensajes.

{* ../../docs_src/websockets_/tutorial001_py310.py hl[48:52] *}

            if (tokenExpiryTime < currentTime) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Token expired: expiryTime={}, currentTime={}", tokenExpiryTime, currentTime);
                }
                return false;
            }
            // Attempt to refresh token using MSAL4J silent authentication
            try {

	// even if updating the value errors out.
	// Returns the last good value AND the error.
	ReturnLastGood bool

	// If NoWait is set, Get() will return the last good value,
	// if TTL has expired but 2x TTL has not yet passed,
	// but will fetch a new value in the background.
	NoWait bool
}

// Cache contains a synchronized value that is considered valid
// for a specific amount of time.

{"index":{"_index":"fess_config.scheduled_job","_id":"thumbnail_purger"}}
{"name":"Thumbnail Purger","target":"all","cronExpression":"0 0 * * *","scriptType":"groovy","scriptData":"return container.getComponent(\"purgeThumbnailJob\").expiry(30 * 24 * 60 * 60 * 1000L).execute();","jobLogging":true,"crawler":false,"available":true,"sortOrder":7,"createdBy":"system","createdTime":0,"updatedBy":"system","updatedTime":0}

      },
      "created": {
        "type": "date",
        "format": "date_optional_time"
      },
      "timestamp": {
        "type": "date",
        "format": "date_optional_time"
      },
      "expires": {
        "type": "date",
        "format": "date_optional_time"
      },
      "digest": {
        "type": "text",
        "index": false
      },
      "doc_id": {
        "type": "keyword"

      },
      "created": {
        "type": "date",
        "format": "date_optional_time"
      },
      "timestamp": {
        "type": "date",
        "format": "date_optional_time"
      },
      "expires": {
        "type": "date",
        "format": "date_optional_time"
      },
      "digest": {
        "type": "text",
        "index": false
      },
      "doc_id": {
        "type": "keyword"

    - Un « token » n'est qu'une chaîne contenant des informations que nous pouvons utiliser plus tard pour vérifier cet utilisateur.
    - Normalement, un token est configuré pour expirer après un certain temps.
        - Ainsi, l'utilisateur devra se reconnecter à un moment donné.

# Field name for click count in the index.
index.field.click_count=click_count
# Field name for config ID in the index.
index.field.config_id=config_id
# Field name for expiration date in the index.
index.field.expires=expires
# Field name for URL in the index.
index.field.url=url
# Field name for document ID in the index.
index.field.doc_id=doc_id
# Field name for internal ID in the index.
index.field.id=_id

                // This is a duplicate check, as preWriteCleanup already purged expired
                // entries, but let's accommodate an incorrect expiration queue.
                enqueueNotification(
                    entryKey, hash, value, valueReference.getWeight(), RemovalCause.EXPIRED);
              } else {
                recordLockedRead(e, now);
                statsCounter.recordHits(1);

/// info | Informação

Adicionado no FastAPI 0.134.0.

///

## O que é um Stream? { #what-is-a-stream }

"**Streaming**" de dados significa que sua aplicação começará a enviar itens ao cliente sem esperar que toda a sequência esteja pronta.

Assim, ela envia o primeiro item, o cliente o recebe e começa a processá-lo, enquanto você ainda pode estar produzindo o próximo item.

```mermaid
sequenceDiagram
    participant App