def validate_ip_ranges
      raise ActionController::RoutingError.new('Not Found') unless SalesforceArSync::IPConstraint.new.matches?(request)
    end
def validate_ip_ranges
      raise ActionController::RoutingError.new('Not Found') unless SalesforceArSync::IPConstraint.new.matches?(request)
    end
to be used in a before_filter, checks ip ranges specified in configuration
 and renders a 404 unless the request matches