string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%89%80%E6%9C%89%E7%9A%84%E5%9B%BD%E5%AE%B6%E5%90%8D%E7%A7%B0%E8%8B%B1%E6%96%87%E7%BC%A9%E5%86%99 => Received HTTP code 403 from proxy after CONNECT"
所有的国家名称英文缩写
