string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=21%E6%9D%A1%E7%BA%A6%E6%98%AF%E8%B0%81%E4%B8%8E%E6%97%A5%E6%9C%AC%E7%AD%BE%E8%AE%A2%E7%9A%84%E5%91%A2 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
21条约是谁与日本签订的呢
