string(268) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E5%9B%BD%E9%81%87%E5%88%BA%E7%9A%849%E4%BD%8D%E6%80%BB%E7%BB%9F%E5%8F%AB%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
美国遇刺的9位总统叫什么
