string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B8%85%E9%99%A4%E7%94%B5%E8%84%91%E5%86%85%E5%AD%98%E7%9A%84%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
清除电脑内存的方法
