public function execResize($exec, $w, $h)
    {
        return $this->browser->post(
            $this->uri->expand(
                '/exec/{exec}/resize{?w,h}',
                array(
                    'exec' => $exec,
                    'w' => $w,
                    'h' => $h
                )
            )
        )->then(array($this->parser, 'expectEmpty'));
    }