string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A6%82%E4%BD%95%E6%89%8D%E8%83%BD%E6%B8%85%E7%94%B5%E8%84%91%E5%86%85%E5%AD%98 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
如何才能清电脑内存
