string(191) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ppi%E5%92%8Ccpi%E7%9A%84%E5%85%B3%E7%B3%BB => Received HTTP code 403 from proxy after CONNECT"
ppi和cpi的关系网!