string(262) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=b2b%E5%92%8Cb2c%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%E5%95%8A => Failed to connect to 61.171.74.35 port 38041: Connection refused"
b2b和b2c的区别是什么意思啊
