string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E8%93%9D%E5%AE%9D%E4%B9%A6%E4%BD%9C%E7%94%A8%E5%A4%A7%E5%90%97 => Failed to connect to 218.78.59.96 port 38043: Connection refused"
二建蓝宝书作用大吗
