string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9B%BD%E9%99%85%E6%B2%B9%E4%BB%B7%E6%9A%B4%E8%B7%8C%E7%9A%84%E5%8E%9F%E5%9B%A0 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
国际油价暴跌的原因
