string(229) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%B8%80%E5%BB%BApdf%E6%95%99%E6%9D%90%E4%B8%8B%E8%BD%BD => Failed to connect to 101.89.117.144 port 38017: Connection refused"
2021一建pdf教材下载
