Sending A Custom Header

Posted on 2008-10-09
Last Modified: 2013-11-08
Hello, I need to send a custom header to the requesting host but its my first time attempting this and I cant get it to work.

Im sending the Custom header using this:
                    HttpContext.Current.Response.ContentType = "image/jpeg"
                    HttpContext.Current.Response.Headers.Add("image-status", "1")
                    outputImage.Save(HttpContext.Current.Response.OutputStream, JPEGCodec, EncParams)

And in my test page I have:
        Dim URL_Object As New System.Uri("")
        Dim URL_WebRequest As System.Net.HttpWebRequest
        Dim URL_WebResponse As System.Net.HttpWebResponse
        URL_WebRequest = System.Net.WebRequest.Create(URL_Object)
        URL_WebRequest.Timeout = 20000
        URL_WebResponse = URL_WebRequest.GetResponse
        For Each Header As String In URL_WebResponse.Headers

But my custom header is not contained in the response when I write out all the header items to the browser.
I also tried:
HttpContext.Current.Response.AppendHeader("image-status", "1")
What am i doing wrong?

Question by:grogo21
  • 2

Expert Comment

ID: 22683455

Download and install fiddler, it is a free application that will allow you to see all traffic between your browser and the web server. Headers, cookies, source, etc.

With fiddler running, navigate your page a few times to see what headers are being passed.

Author Comment

ID: 22683545
Fiddler shows that the custom headers are there.  But how can I access their values.  Using the following line:
I get error Object reference not set to an instance of an object.


Accepted Solution

rlh68 earned 500 total points
ID: 22684127

Change your For...Each statement to the below and see what you get.

  For Each key As String In URL_WebResponse.Headers.Keys
       Dim value As String = URL_WebResponse.Headers.Item(key)
       Response.Write(key & " : " & value & "<br />")

' may be add this line too.

 Response.Write("My Field = " & URL_WebResponse.Headers.Item("image-status") & "<br />")

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