Dingo\Api\Routing\Router::setConditionalRequest PHP Method

    public function setConditionalRequest($conditionalRequest)
    {
        $this->conditionalRequest = $conditionalRequest;
    }

 /**
  * Register the router.
  */
 protected function registerRouter()
 {
     $this->app->singleton('api.router', function ($app) {
         $router = new Router($app[Adapter::class], $app[ExceptionHandler::class], $app, $this->config('domain'), $this->config('prefix'));
         $router->setConditionalRequest($this->config('conditionalRequest'));
         return $router;
     });
     $this->app->singleton(ResourceRegistrar::class, function ($app) {
         return new ResourceRegistrar($app[Router::class]);
     });
 }