string(260) "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%E5%B8%B8%E9%97%AE%E9%97%AE%E9%A2%9820%E4%B8%AA%E5%8F%8A%E7%AD%94%E6%A1%88 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
面试常问问题20个及答案
