// By the time we get to WriteToStreamAsync, it's too late to set the Content Headers
public override Task WriteToStreamAsync(Type type, object value, Stream stream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)
{
if (!typeof (IEntity).IsAssignableFrom(type)) return Tasks.Empty;
var objectToSerialize = SerializeSirenEntity((IEntity)value);
return stream.WriteJsonToStreamAsync(objectToSerialize, cancellationToken);
}
