关于下载的东西 解释下 谢谢

Question

Response.Clear(); Response.ClearContent(); Response.ClearHeaders(); string

urlName = HttpUtility.UrlEncode(f.f_filename,System.Text.Encoding.UTF8);

Response.AddHeader("Content-Disposition", "attachment;filename=" + urlName);

Response.AddHeader("Content-Length", info.Length.ToString());

Response.AddHeader("Content-Transfer-Encoding", "binary"); Response.ContentType

= "application/octet-stream"; Response.ContentEncoding =

System.Text.Encoding.GetEncoding("gb2312"); Response.WriteFile(info.FullName);

Response.Flush(); Response.End();

每个response 的什么意思都 ？？？？