def render(self, link_url, image_url, **kwargs):
        """Preview link_url and image_url after interpolation.

        Args:
            link_url (str): URL of the badge link
            image_url (str): URL of the badge image
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabRenderError: If the rendering failed

        Returns:
            dict: The rendering properties
        """
        path = '%s/render' % self.path
        data = {'link_url': link_url, 'image_url': image_url}
        return self.gitlab.http_get(path, data, **kwargs)