TRestRequest ExecuteAsync Parameter Frage

[TiGü]

Delphi-Quellcode:

var
  // aus der Unit REST.Types ganz oben: TCompletionHandlerWithError = TProc<TObject>;
  MyCompletionHandlerWithError: TCompletionHandlerWithError;
begin
  MyCompletionHandlerWithError := procedure(AObject: TObject)
    begin
      if Assigned(AObject) and (AObject is Exception) then
      begin
        raise Exception(AObject); // oder was immer du möchtest!
      end;
    end;

  FRESTRequest.ExecuteAsync(nil, true, true, MyCompletionHandlerWithError);
end;