code: public function execute()
      {
          $result = $this->resultJsonFactory->create();
          try {
              $activeVersion = $this->getRequest()->getParam('active_version');
              $snippet = Config::BLOCKING_SETTING_NAME;
              $req = $this->api->hasSnippet($activeVersion, $snippet);
  
              if ($req == false) {
                  return $result->setData([
                      'status' => false
                  ]);
              }
  
              return $result->setData([
                  'status'        => true,
                  'req_setting'   => $req
              ]);
          } catch (\Exception $e) {
              return $result->setData([
                  'status'    => false,
                  'msg'       => $e->getMessage()
              ]);
          }
      }
docs: Verifies whether or not the blocking settings snippet exists on specified Fastly version
  
  @return Json