string(248) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%99%BD%E7%9B%92%E6%B5%8B%E8%AF%95%E4%B8%8E%E9%BB%91%E7%9B%92%E6%B5%8B%E8%AF%95%E5%8C%BA%E5%88%AB => Received HTTP code 403 from proxy after CONNECT"
白盒测试与黑盒测试区别
