render

# File actionpack/lib/action_dispatch/middleware/public_exceptions.rb, line 35
      def render(status, content_type, body)
        format = "to_#{content_type.to_sym}" if content_type
        if format && body.respond_to?(format)
          render_format(status, content_type, body.public_send(format))
        else
          render_html(status)
        end
      end