C# 如何手动设置 下载token失效时间 自问自答

Question

  //times ：秒为单位进行计算，默认值是3600
  uint times = 20 * 60;
  string url = Qiniu.RS.GetPolicy.MakeBaseUrl(DOMAIN, key);
  //生成fop_url
  string imageInfoURL = ImageInfo.MakeRequest(url);
  imageInfoURL = GetPolicy.MakeRequest(imageInfoURL);//默认3600秒
  imageInfoURL = GetPolicy.MakeRequest(imageInfoURL, times);//手动1200秒