servervariables.cs

            int loop1, loop2;

            // Load ServerVariable collection into NameValueCollection object.
            var coll = Request.ServerVariables;
            // Get names of all keys into a string array. 
            String[] arr1 = coll.AllKeys;
            for (loop1 = 0; loop1 < arr1.Length; loop1++)
            {
                Response.Write("Key: " + arr1[loop1] + "<br>");
                String[] arr2 = coll.GetValues(arr1[loop1]);
                for (loop2 = 0; loop2 < arr2.Length; loop2++)
                {
                    Response.Write("Value " + loop2 + ": " + Server.HtmlEncode(arr2[loop2]) + "<br>");
                }
            }