call

# File actionpack/lib/action_dispatch/middleware/debug_exceptions.rb, line 57
    def call(env)
      request = ActionDispatch::Request.new env
      _, headers, body = response = @app.call(env)

      if headers["X-Cascade"] == "pass"
        body.close if body.respond_to?(:close)
        raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
      end

      response
    rescue Exception => exception
      raise exception unless request.show_exceptions?
      render_exception(request, exception)
    end