string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%96%E7%95%8C%E4%B8%8A%E6%9C%80%E5%A4%A7%E7%9A%84%E7%8B%97%E6%98%AF%E5%93%AA%E5%8F%AA => Failed to connect to 14.18.117.71 port 38164: Connection refused"
世界上最大的狗是哪只
