bug in GzipStream on Response.Filter after Response.Flush RSS

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  vovin

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  10 Points

  2 Posts

  bug in GzipStream on Response.Filter after Response.Flush

  Nov 09, 2006 10:07 AM|LINK

  I've discovered a bug, which results in truncation of the end of the response on gzipped stream.

  Reponse content is cut when using gzipped (or deflated) stream on Response.Filter and calling both Response.Flush and Response.End.

  To reproduce the bug following code may be used:

      public class FlushTestPage : System.Web.UI.Page
      {
          protected override void OnInit(System.EventArgs e)
          {
              base.OnInit(e);
              Response.Filter = new System.IO.Compression.GZipStream(Response.Filter, System.IO.Compression.CompressionMode.Compress);
              Response.AppendHeader("Content-encoding", "gzip");
              Response.Write("Hello number 1\n");
              Response.Flush();
              Response.Write("Hello number 2\n");
              Response.Flush();
              Response.End();
          }
      }
   

   The result gfrom above is:

  Hello Number 1
  Hello Number
  

  As you can see last letter is cut from the response. In some cases it may be more characters truncated.

  Above situationb happens only when you use both Response.Flush and Response.End on gzipped stream. If there was no flush or end, the result would be sent to browser properly. The same situation works with deflate stream.
  

  regards,

  Pawel Rogozinski
  Technical Leader at Eracent
  

   

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  Jasson_King

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  8057 Points

  1520 Posts

  Re: bug in GzipStream on Response.Filter after Response.Flush

  Nov 16, 2006 09:34 AM|LINK

  Hi,

     This is not a bug.I think you make a mistake."\r\n" in C# is a char,not only "\n".If you change your codes as the following,everything is OK.

     protected override void OnInit(System.EventArgs e)
          {
              base.OnInit(e);
              Response.Filter = new System.IO.Compression.GZipStream(Response.Filter, System.IO.Compression.CompressionMode.Compress);
              Response.AppendHeader("Content-encoding", "gzip");
              Response.Write("Hello number 1\r\n");
              Response.Flush();
              Response.Write("Hello number 2\r\n");
              Response.Flush();
              Response.End();
          }