public function exportHtml($bookSlug, $pageSlug)
{
$book = $this->bookRepo->getBySlug($bookSlug);
$page = $this->pageRepo->getBySlug($pageSlug, $book->id);
$containedHtml = $this->exportService->pageToContainedHtml($page);
return response()->make($containedHtml, 200, ['Content-Type' => 'application/octet-stream', 'Content-Disposition' => 'attachment; filename="' . $pageSlug . '.html']);
}