string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%A7%E5%93%81%E5%8A%A8%E9%94%80%E7%8E%87%E8%AE%A1%E7%AE%97%E5%85%AC%E5%BC%8F => Received HTTP code 403 from proxy after CONNECT"
产品动销率计算公式
