public function render($options = [])
    {
        if ($this->isPerformed()) {
            throw new Exception\DoubleRenderException(
                'Can only render or redirect once per action'
            );
        }
        list ($renderOptions, $options) = $this->splitOptions($options);
        $renderOptions = $this->normalizeRender($renderOptions);
        $this->response()->setBody($this->renderToString($renderOptions, $options));
    }