/// <summary>
/// Unsubscribes from the subscription.
/// </summary>
/// <param name="cancellationToken"></param>
/// <returns></returns>
public async ValueTask UnsubscribeAsync(IEnumerable <KeyValuePair <string, string> > headers = null, CancellationToken cancellationToken = default)
{
await connection.UnsubscribeAsync(this, headers, cancellationToken);
}
