string(238) "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%E6%95%99%E6%9D%90%E6%94%B9%E5%8A%A8%E5%A4%A7%E5%90%97 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
二建教材改动大吗
