string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E4%B8%80%E6%9C%AC%E4%B8%80%E6%9C%AC%E7%9C%8B%E8%BF%98%E6%98%AF4%E9%97%A8%E4%B8%80%E8%B5%B7%E7%9C%8B => Failed to connect to 14.18.117.71 port 38133: Connection refused"
一建一本一本看还是4门一起看
