string(243) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2023%E4%B8%80%E5%BB%BA%E8%AF%BE%E6%9C%AC%E5%8F%98%E5%8C%96%E5%A4%A7%E5%90%97 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
2023一建课本变化大吗
