string(232) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=b2b%E7%9A%84%E8%BD%AF%E4%BB%B6%E9%83%BD%E6%9C%89%E4%BB%80%E4%B9%88 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
b2b的软件都有什么
