string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%9D%A2%E8%AF%95%E4%B8%AD%E4%B8%80%E4%BA%9B%E5%B8%B8%E8%A7%81%E7%9A%84%E9%97%AE%E7%AD%94%E6%8A%80%E5%B7%A7 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
面试中一些常见的问答技巧
