string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cpi%E4%B8%8Eppi%E7%9A%84%E5%8C%BA%E5%88%AB%E4%B8%8E%E8%81%94%E7%B3%BB => Failed to connect to 101.89.117.144 port 38076: Connection refused"
cpi与ppi的区别与联系
