I wrote an ASP.Net web page that will take a QueryString
and stream a file to the client. The file is stored in a SQL Server database. Everything works great when I'm running the web site locally during development. When I run it in production from the server I can get a file through Firefox, but not Chrome. In Chrome I get Error 100 (net::ERR_CONNECTION_CLOSED): Unknown error.
See some other posts that mention this could be related to Content-Length
, however, I can't understand why this would work in development and not production. For that reason I think there must be something else going on here.
Thanks for any suggestions/hints.
Here is my code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim Data_ID As String = Request.QueryString("Data_ID")
Using dt As New Enterprise_Error_Log.Field_FileDataTable
Using ta As New Field_FileTableAdapter
ta.Fill(dt, Data_ID)
If dt.Rows.Count > 0 Then
Dim myRow As Enterprise_Error_Log.Field_FileRow = dt.Rows(0)
Dim myFileName As String = myRow("Field_File_Name")
'Dim myFileData() As Byte = myRow("Field_File")
Dim myFileLength As String = myRow("Field_File_Length")
Response.BufferOutput = False
Response.AddHeader("Content-Disposition", "inline;filename=""" & myFileName & """")
Response.AddHeader("Content-Length", myFileLength)
StreamFile(Data_ID)
Response.Close()
End If
End Using
End Using
End Sub
Private Sub StreamFile(ByVal Data_ID As String)
Dim bolGotContentType As Boolean = False
Using conn = New SqlConnection(Enterprise_Error_LogConnectionString.ConnectionString)
Using cmd = conn.CreateCommand()
conn.Open()
cmd.CommandText = "SELECT Field_File FROM Ext_Error_Log WHERE (Data_ID = @Data_ID)"
cmd.Parameters.AddWithValue("@Data_ID", Data_ID)
Using reader = cmd.ExecuteReader(Data.CommandBehavior.SequentialAccess)
While reader.Read()
Dim buffer As Byte() = New Byte(8040) {}
' Read chunks of 1KB
Dim bytesRead As Long = 0
Dim dataIndex As Long = 0
Do
'read next chunk
bytesRead = reader.GetBytes(0, dataIndex, buffer, 0, buffer.Length)
If bytesRead > 0 Then
'advance index
开发者_如何学运维 dataIndex += bytesRead
'if this is the first chunk, get the mime type from it.
If Not bolGotContentType Then
Response.ContentType = "application/octet-stream" 'getMimeFromFile(buffer)
bolGotContentType = True
End If
Response.BinaryWrite(buffer)
Response.Flush()
End If
Loop Until bytesRead = 0
End While
End Using
End Using
End Using
End Sub
My headers are as follows:
Cache-Control: private
Date: Mon, 24 Jan 2011 20:37:33 GMT
Content-Length: 3153269
Content-Type: application/octet-stream
Content-Disposition: attachment;filename="C:\Users\CBARTH\AppData\Local\Temp\tmp4BC8.mdmp.gz";size=3153169
Server: Microsoft-IIS/6.0
X-AspNet-Version: 2.0.50727
X-Powered-By: ASP.NET
Content-Encoding: gzip
I recommend inspecting the actual response in an HTTP trace tool (Firefox LiveHTTP headers comes to mind), and to check whether something weird with Content-Length is going on (set multiple times?)
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