string(227) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E4%B8%80%E5%BB%BA%E6%B3%95%E8%A7%84%E6%95%99%E6%9D%90pdf => Failed to connect to 61.171.74.35 port 38027: Connection refused"
2020一建法规教材pdf
