CustomerController.cs

public class CustomerController : NancyModule
{
    public CustomerController() : base("/customers")
    {
        try
        {
            var obj = new CustomerService();

            Get["/"] = _ =>
            {
                var ret = obj.ReturnCustomer();
                return Response.AsJson(ret);
            };

            Post["/"] = _ =>
            {
                obj.UpdateCustomer();
                return Response.AsJson("Cleared");
            };
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
}