string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E6%A0%B7%E6%B8%85%E7%90%86%E7%94%B5%E8%84%91%E8%BF%90%E8%A1%8C%E5%86%85%E5%AD%98%E4%B8%8D%E8%B6%B3 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
怎么样清理电脑运行内存不足
