/// <summary>
/// //Can be called from any handler to trigger the error chain.
/// </summary>
/// <param name="val"></param>
public void Fail(JavaScript.Object val)
{
}
/// <summary>
/// Registers a response handler.
/// </summary>
/// <param name="context">"this" context for the response method</param>
/// <param name="handle">object function(sender, val) {}
/// <para>sender is async object, if it return value other than null, the value is pass to next handler as val.</para>
/// </param>
/// <returns></returns>
public Async Response(JavaScript.Object context, Func <Async, JavaScript.Object, JavaScript.Object> handle)
{
return(null);
}