string(285) "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%E8%BF%90%E8%A1%8C%E5%86%85%E5%AD%98%E6%80%8E%E4%B9%88%E6%B8%85%E7%90%86%E6%89%8D%E5%B9%B2%E5%87%80 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
电脑运行内存怎么清理才干净
