string(267) "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%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 101.89.143.195 port 38205: Connection refused"
电脑内存怎么清理才干净
