Ouzo\Routing\RouteRule::hasRequiredAction PHP Method

    public function hasRequiredAction()
    {
        if ($this->actionRequired) {
            return (in_array($this->method, array('GET', 'POST')) || is_array($this->method)) && !$this->action;
        }
        return $this->actionRequired;
    }

 private static function addRoute($method, $uri, $action, $requireAction = true, $options = array(), $isResource = false)
 {
     $methods = Arrays::toArray($method);
     if (self::$isDebug && $requireAction && self::$validate && self::existRouteRule($methods, $uri)) {
         $methods = implode(', ', $methods);
         throw new InvalidArgumentException('Route rule for method ' . $methods . ' and URI "' . $uri . '" already exists');
     }
     $elements = explode('#', $action);
     $controller = Arrays::first($elements);
     $actionToRule = Arrays::getValue($elements, 1);
     $routeRule = new RouteRule($method, $uri, $controller, $actionToRule, $requireAction, $options, $isResource);
     if ($routeRule->hasRequiredAction()) {
         throw new InvalidArgumentException('Route rule ' . $uri . ' required action');
     }
     self::$routes[] = $routeRule;
     foreach ($methods as $method) {
         self::$routeKeys[$method . $uri] = true;
     }
 }