protected override void OnLoad(EventArgs e)
        {
            Response.Clear();
            Response.ContentType = "text/xml";

            string base64gheader = Request.Headers["Graffiti-Authorization"];

            if (!string.IsNullOrEmpty(base64gheader))
            {
                XmlTextWriter writer = new XmlTextWriter(Context.Response.OutputStream, Encoding.UTF8);
                try
                {
                    var    gheaderBytes = Convert.FromBase64String(base64gheader);
                    string rawValue     = Encoding.Default.GetString(gheaderBytes);

                    int index = rawValue.IndexOf(":");

                    string username = rawValue.Substring(0, index);
                    string password = rawValue.Substring(index + 1);

                    IGraffitiUser gu = GraffitiUsers.Login(username, password, true);

                    if (gu != null)
                    {
                        if (IsValidAccess(gu))
                        {
                            HandleRequest(gu, writer);
                            writer.Close();
                        }
                        else
                        {
                            UnuathorizedRequest();
                        }

                        return;
                    }
                }
                catch (RESTConflict conflict)
                {
                    Response.StatusCode = 409;
                    writer.WriteElementString("error", conflict.Message);
                    writer.Close();
                    return;
                }
                catch (Exception ex)
                {
                    Response.StatusCode = 500;
                    writer.WriteElementString("error", ex.Message);
                    writer.Close();
                }
            }

            UnuathorizedRequest();

            base.OnLoad(e);
        }