string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%80%90%E5%8E%8B%E6%B5%8B%E8%AF%95%E5%9B%BD%E6%A0%87%E8%A7%84%E8%8C%83 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
耐压测试国标规范
