delphi idhttp post 正确和错误的信息两次结果一样？？

POST  一个https 的站点 正确和错误的返回值 一样
===
procedure TForm1.Button1Click(Sender: TObject);var data:TStringList;
begin
data:= TStringList.Create;
try
     idhttp1.ReadTimeout:= 9000;
     idhttp1.Request.Accept := 'text/html, */*';
     idhttp1.Request.UserAgent := 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)';
     idhttp1.Request.ContentType := 'application/x-www-form-urlencoded';
     idhttp1.HandleRedirects := true;
     data.Add( 'formhash=96cb5fa5&cookietime=2592000&loginfield=username&username=用户名&password=密码&userlogin=%E7%99%BB%E5%BD%95');
     Memo1.Lines.Text := IdHTTP1.Post('https://forum.eviloctal.com/logging.php?action=login&loginsubmit=true', data);
   finally
     data.Free;
     application.ProcessMessages;   end;
 end;
======返回值都是
====
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郁闷 这是为什么呢 求解