    # File lib/action_controller/vendor/rack-1.0/rack/cascade.rb, line 14
        def call(env)
          status = headers = body = nil
          raise ArgumentError, "empty cascade"  if @apps.empty?
          @apps.each { |app|
            begin
              status, headers, body = app.call(env)
              break  unless @catch.include?(status.to_i)
            end
          }
          [status, headers, body]
        end