call

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 23
        def call(env)
          req = @request.new(env)

          @constraints.each { |constraint|
            if constraint.respond_to?(:matches?) && !constraint.matches?(req)
              return [ 404, {'X-Cascade' => 'pass'}, [] ]
            elsif constraint.respond_to?(:call) && !constraint.call(*constraint_args(constraint, req))
              return [ 404, {'X-Cascade' => 'pass'}, [] ]
            end
          }

          @app.call(env)
        end