AddAHeader.aspx

<%@ Page Language="VB" %>

<script runat="server">
    Protected Sub Page_Load(sender As Object, e As EventArgs)
        Dim lcHeader As String = ""
        
        If Not Request.Headers("X-MyHeader") Is Nothing Then
            lcHeader = Request.Headers("X-MyHeader").ToString()
            Response.Write("Hey, thanks for sending X-MyHeader: " & lcHeader)
        Else
            Response.Write("Aww... :(   I was looking for X-MyHeader...")
        End If
        
    End Sub
</script>