Drupal 9 check if UUD is valid

// Checks if the format of UUID is valid.
// Does not verify that the UUID matches an entity
// in the database.
use Symfony\Component\HttpKernel\Exception\HttpException;
if (empty($node_uuid) || !Uuid::isValid($node_uuid)) {
    throw new HttpException(400, 'Missing or invalid value for node uuid.');
}

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