string(247) "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%E8%AF%A5%E9%97%AE%E7%9A%84%E9%97%AE%E9%A2%98%E9%9B%86%E9%94%A6 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
面试该问的问题集锦
