string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%95%86%E6%A0%87%E7%AC%A6%E5%8F%B7%E6%80%8E%E4%B9%88%E6%89%93%E5%87%BA%E6%9D%A5%E7%9A%84 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
商标符号怎么打出来的
