I'm trying to stream in image from another domain asynchronously.
My ashx looks like this:
<%@ WebHandler Language="VB" Class="Handlers.AsyncImageHandler" Debug="true"
%>

Here is the vb:
Imports System.net
imports system.io

Namespace .Handlers

   Public Class AsyncImageHandler
       Implements System.Web.IHttpAsyncHandler

       Private _context As HttpContext
       Private _webreq As HttpWebRequest

       Sub ProcessRequest(ByVal context As HttpContext) _
               Implements System.Web.IHttpHandler.ProcessRequest
           Throw New InvalidOperationException()
       End Sub

       Function BeginProcessRequest(ByVal context As HttpContext, ByVal cb
As AsyncCallback, ByVal extraData As Object) As IAsyncResult _
           Implements System.Web.IHttpAsyncHandler.BeginProcessRequest
         
           ' Save a reference to the HttpContext
           _context = System.Web.HttpContext.Current

           _webreq =
DirectCast(WebRequest.Create("http://www.nws.noaa.gov/weather/images/fcicons/shra20.jpg"), HttpWebRequest)

           Return _webreq.BeginGetResponse(cb, extraData)
       End Function

       Sub EndProcessRequest(ByVal result As IAsyncResult) _
            Implements System.Web.IHttpAsyncHandler.EndProcessRequest
           Try
               Dim response As HttpWebResponse =
CType(_webreq.EndGetResponse(result), HttpWebResponse)
               Dim Image As Byte()

               Image =
getImageByteArray(System.Drawing.Image.FromStream(response.GetResponseStream()))
               _context.Response.ContentType = "image/jpeg"
               _context.Response.AddHeader("Vary", "User-Agent")

               _context.Response.OutputStream.Write(Image, 78, Image.Length
- 78)
           Finally

           End Try
       End Sub

       ReadOnly Property IsReusable() As Boolean Implements
IHttpHandler.IsReusable
           Get
               Return False
           End Get
       End Property

       Private Function getImageByteArray(ByVal image As
System.Drawing.Image) As Byte()
           Dim ms As New MemoryStream()
           image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)
           Return ms.ToArray()
       End Function
   End Class
End Namespace

The baffiling response content (in text format)  looks like this:

<%@ WebHandler Language="VB" Class="Handlers.AsyncImageHandler" Debug="true"
%>
����

What could I be doing that is sending the handler directive in the response?