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textdata:=idhttp1.Get('http://bigcharts.marketwatch.com/intchart/frames/main.asp?symb=de:840400');                    

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{hier ->} if Assigned(ProxyParams.Authentication) and
    (ProxyParams.Authentication.CurrentStep = ProxyParams.Authentication.Steps) then begin
    ProxyParams.ProxyUsername := '';
    ProxyParams.ProxyPassword := '';
    ProxyParams.Authentication.Reset;
  end;
end;                    

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procedure TForm1.Button1Click(Sender: TObject);
var
textdata:string;
begin
 textdata:=idhttp1.Get('http://bigcharts.marketwatch.com/intchart/frames/main.asp?symb=de:840400');
 memo1.lines.add(textdata);
 end;