https://medium.com/@alexwu900527/%E7%94%A8flask%E5%81%9Atxt%E7%9A%84%E6%AA%94%E6%A1%88%E8%AE%80%E5%AF%AB-%E4%B8%A6%E5%9C%A8%E5%8F%A6%E4%B8%80%E5%80%8B%E9%A0%81%E9%9D%A2%E9%A1%AF%E7%A4%BA%E6%AF%8F%E5%80%8B%E5%AD%97%E6%AF%8D%E7%9A%84%E5%80%8B%E6%95%B8-77ef918aec7c
