string(356) "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%E6%88%90%E7%BB%A9%E5%90%88%E6%A0%BC%E5%90%8E%E9%9C%80%E8%A6%81%E7%94%B3%E8%AF%B7%E8%AF%81%E4%B9%A6%E5%90%97%E7%9F%A5%E4%B9%8E => Failed to connect to 101.91.112.32 port 38195: Connection refused"
注册安全工程师成绩合格后需要申请证书吗知乎
