帮忙看看这个代码（fphttpclient获取验证码图片）

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帮忙看看这个代码（利用fphttpclient 的get获取验证码图片），第一次成功，第二次就不成功了！网站返回数据：Forbidden, Please turn off CC
但是用浏览器页面连续刷新就不会出现这样的问题！郁闷。。。

uses fphttpclient

procedure TForm1.Button1Click(Sender: TObject);
var
  Client: TFPHTTPClient;
  url:string;
  response:TStream;
  png:TPortableNetworkGraphic;
begin
  Client := TFPHTTPClient.Create(nil);
  url:='http://bbs.eyuyan.com/ck.php?nowtime=1';
  response:=TMemoryStream.Create();
  png:=TPortableNetworkGraphic.Create;
  try
    Client.AllowRedirect := True;
    Client.AddHeader('Accept','*/*');
    Client.AddHeader('Content-Type','application/x-www-form-urlencoded');
    Client.AddHeader('User-Agent','Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 6.1)');
    Client.AddHeader('Cache-Control','no-cache');
    Client.Get(url,response);
    response.position:=0;
    png.LoadFromStream(response);
    Image1.Picture.Assign(png);
  finally
    Client.Free;
  end;
end;