string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%B5%E8%84%91%E6%80%8E%E6%A0%B7%E6%B8%85%E7%A9%BA%E5%86%85%E5%AD%98 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
电脑怎样清空内存
