Tricky Simple File Download Proxy Handler

Today I wanna play a bit with Streams and specially with Response.OutputStream. So I decided to make a Simple File Download Proxy Handler in order to Download Files through an HttpHandler which download Files from Remote Site.

It’s Tricky, and may not be very useful :)

Here is the Code

public class FileProxyHandlerBase : HttpHandlerBase
{
  #region Private Properties

  private String RemoteUrl { get; set; }
  private Uri RemoteUri { get; set; }
  private String FileName { get; set; }

  #endregion

  protected override void Process()
  {
      if (!String.IsNullOrEmpty(Request.QueryString["url"]))
      {
          RemoteUrl = Request.QueryString["url"];
      }

      Uri uri;
      if (!Uri.TryCreate(RemoteUrl, UriKind.Absolute, out uri))
      {
          Response.Write("Unable to Process File");
          Response.End();
          return;
      }
      RemoteUri = uri;

      if (RemoteUri.Scheme == Uri.UriSchemeFtp)
      {
          Response.Write("Unable to Process File");
          Response.End();
          return;
      }

      int index = RemoteUrl.LastIndexOf("/") + 1;
      FileName = RemoteUrl.Substring(index, RemoteUrl.Length - index);

      HttpWebRequest _webRequest = WebRequest.Create(RemoteUri) as HttpWebRequest;
      Stream ResponseStream = _webRequest.GetResponse().GetResponseStream();

      Response.ClearContent();
      Response.ContentType = "text/plain";
      Response.AddHeader("Content-Disposition", "attachment; filename=" + FileName);

      using (BinaryWriter bw = new BinaryWriter(Response.OutputStream))
      {
          byte[] buffer = new byte[1];
          while (ResponseStream.Read(buffer, 0, 1) > 0)
          {
              bw.Write(buffer);
          }
      }
      Response.End();
  }
}

You should use it like that : http://mysite.com/MyHandler.ashx?url=http://www.myRemoteSite.com/MyFile.zip

Source : http://blog.sb2.fr/post/2008/12/21/Tricky-Simple-File-Download-Proxy-Handler.aspx