code: public function invoke(MethodInvocation $invocation)
      {
          $produce = $invocation->getMethod()->getAnnotation(Produces::class);
          /* @var $produce \BEAR\Accept\Annotation\Produces */
          $accept = $this->getAccept($this->available['Accept'], $produce->value);
          $accept = new Accept(['Accept' => $accept]);
          list($context, $vary) = $accept->__invoke($_SERVER);
          $renderer = (new AppInjector($this->appMeta->name, $context))->getInstance(RenderInterface::class);
          $ro = $invocation->getThis();
          /* @var $ro \BEAR\Resource\ResourceObject */
          $ro->setRenderer($renderer);
          $ro = $invocation->proceed();
          $ro->headers['Vary'] = $vary;
  
          return $ro;
      }
docs: {@inheritdoc}