public function getRequestHandler()
    {
        if (isset($this->requestHandler))
            return $this->requestHandler;

        // now instantiating handler from config
        $handlerClass = "\\" . ltrim($this->handlerClass, "\\");
        if (!class_exists($handlerClass))
            throw new RuntimeException("Unable to create HTTP Handler instance with class: " . var_export($handlerClass, true));

        $this->requestHandler = new $handlerClass();
        return $this->requestHandler;
    }