string(246) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cpi%E4%B8%8Eppi%E4%B9%8B%E9%97%B4%E7%9A%84%E4%BC%A0%E5%AF%BC%E5%85%B3%E7%B3%BB => Failed to connect to 101.89.159.206 port 38187: Connection refused"
cpi与ppi之间的传导关系
