Try this console app that will show you all of the headers returned by the server.
Url to the SDF file as the command line argument.
using System;
using System.Net;
namespace HttpHeaders
{
class Program
{
static void Main(string[] args)
{
if (args.Length < 1)
return;
string uri = args[0];
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "HEAD";
var response = request.GetResponse();
foreach (var key in response.Headers.Keys)
{
Console.Write((string)key);
Console.Write(": ");
Console.WriteLine(response.Headers[(string)key]);
}
}
}
}