string(294) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%86%8C%E5%AE%89%E5%85%A8%E5%B7%A5%E7%A8%8B%E5%B8%88%E8%87%AA%E5%AD%A6%E5%8F%AF%E4%BB%A5%E5%90%97%E7%8E%B0%E5%9C%A8 => Failed to connect to 101.89.143.195 port 38205: Connection refused"
注册安全工程师自学可以吗现在
