string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%96%B9%E6%B3%95%E6%8E%AA%E6%96%BD%E6%96%B9%E9%9D%A2%E7%9A%84%E8%87%AA%E6%9F%A5%E9%97%AE%E9%A2%98 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
方法措施方面的自查问题
