Chrome saving streamed file as .gz

Question

I have been banging my head against the wall with this odd behaviour on Chrome

I have files stored encrypted on disk in an unnamed, unordered state. when the files are downloaded by the user, the client is redirected to a download handlers (.ashx) the data is loaded into a stream, decrypted and sent to the client. Now this has worked fine until recently,

It works fine on all browsers except chrome where the file is downloaded as a .gz file and is unreadable?

I have stripped out the stream fetching and cryptography parts for brevity (keep in mind this works perfectly on IE, Firefox etc)

    Private Function StreamFile(ByVal context As System.Web.HttpContext) As Boolean

 context.Response.Clear()
 context.Response.ClearHeaders()
 context.Response.BufferOutput = False
 context.Response.ContentType = "application/octet-stream"
 context.Response.AddHeader("content-disposition", "attachment;filename=""" & _sFileName & """")
 context.Response.AddHeader("content-length", _iSize)
 context.Response.Cache.SetNoServerCaching()
 context.Response.Cache.SetMaxAge(System.TimeSpan.Zero)

 Dim oInputStream As System.IO.Stream = GetStream()
 Dim oBufferedStream As New BufferedStream(oFileStream, context.Response.OutputStream)
 oBufferedStream.ProcessStreams(True)

 context.ApplicationInstance.CompleteRequest()

 Return True

End Function

Public Class BufferedStream
 Private _oInputStream As Stream
 Private _oOutputStream As Stream
 Private _bBuffer() As Byte
 Public Const DEFAULT_BUFFER_SIZE As Integer = 8192

 Public Sub New(ByRef oInputStream As Stream, ByRef oOutputStream As Stream)
  _oInputStream = oInputStream
  _oOutputStream = oOutputStream
  _bBuffer = GetStreamBuffer(ToInteger(_oInputStream.Length))
 End Sub

 Public Function ProcessStreams(ByVal bCloseStreams As Boolean) As Boolean

  Dim iRead As Integer = 0
  Dim iStreamLength As Integer = ToInteger(_oInputStream.Length)

  Try
   iRead = _oInputStream.Read(_bBuffer, 0, _bBuffer.Length)
   While iRead > 0
    _oOutputStream.Write(_bBuffer, 0, _bBuffer.Length)
    iRead = _oInputStream.Read(_bBuffer, 0, _bBuffer.Length)
    If iRead < _bBuffer.Length Then System.Array.Resize(_bBuffer, iRead)
   End While

   If bCloseStreams Then
    Close()
   End If
   Return True

  Catch
   Return False
  End Try
 End Function

 Public Shared Function GetStreamBuffer(ByVal iStreamSize As Integer) As Byte()
  Dim iBufferSize As Integer = iStreamSize - 1
  If iBufferSize > DEFAULT_BUFFER_SIZE Then iBufferSize = DEFAULT_BUFFER_SIZE
  Dim bBuffer As Byte() = New Byte(iBufferSize) {}
  Return bBuffer
 End Function

End Class

Any help would be greatly appreciated.

Here is the HTTP header from fiddler when the file is downloaded in chrome

HTTP/1.1 200 OK
Date: Fri, 30 Oct 2009 00:01:45 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
content-disposition: attachment;filename="codeKiwi.txt"
Content-Length: 349
Cache-Control: private, max-age=0
Content-Type: application/octet-stream

Note that the filename is codekiwi.txt and the contents are some simple plain text, the file gets saved as codekiwi.txt.gz and contains gibberish.

Answer 1

Ok, solved it myself. I turns out that Chrome (and Firefox) REALLY don't like the response.ClearHeaders call, for some reason IE was ok with this, once I removed it the downloads functioned as expected again...