string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8E%86%E5%B1%8A%E7%BE%8E%E5%9B%BD%E6%80%BB%E7%BB%9F%E8%A2%AB%E6%9A%97%E6%9D%80 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
历届美国总统被暗杀
