string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%A8%E7%94%9F%E7%B2%89%E8%BF%98%E6%98%AF%E6%B7%80%E7%B2%89%E5%8B%BE%E8%8A%A1 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
用生粉还是淀粉勾芡
