string(323) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9F%AD%E8%B7%AF%E6%9C%89%E5%93%AA%E4%BA%9B%E5%BD%A2%E5%BC%8F%2C%E5%93%AA%E7%A7%8D%E7%9F%AD%E8%B7%AF%E5%BD%A2%E5%BC%8F%E7%9A%84%E5%8F%AF%E8%83%BD%E6%80%A7%E6%9C%80%E5%A4%A7 => Received HTTP code 403 from proxy after CONNECT"
短路有哪些形式,哪种短路形式的可能性最大
