string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8F%91%E8%86%9C%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95%E5%8F%8A%E4%BD%9C%E7%94%A8 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
发膜使用方法及作用
