string(261) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%A5%E4%B8%8B%E7%BD%91%E7%AB%99%E5%B1%9E%E4%BA%8Eb2b%E6%A8%A1%E5%BC%8F%E7%9A%84%E6%9C%89 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
以下网站属于b2b模式的有
