public String Add([FromRoute] string item) { string session_id = Request.Headers["session-id"]; if (session_id == null) { Console.WriteLine("Session running"); Guid id = allCarts.AddNewCart(item); Response.Headers.Add("session-id", id.ToString()); } else { allCarts.AddToCart(Guid.Parse(session_id), item); } return("Item added to Shopping Cart"); }