string(244) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%BA%8C%E5%BB%BA%E6%95%99%E6%9D%90%E7%BD%91%E7%9B%98%E4%B8%8B%E8%BD%BD => Failed to connect to 101.89.159.206 port 38087: Connection refused"
2021二建教材网盘下载
