string(249) "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%E7%9A%84%E5%86%85%E5%AD%98%E6%B8%85%E7%90%86%E8%BD%AF%E4%BB%B6 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
电脑的内存清理软件
