CONNECT 的短响应（拒绝/错误）：空体 + 主动关连接。
(self, code)
| 871 | self.close_connection = True |
| 872 | |
| 873 | def _connect_reply(self, code): |
| 874 | """CONNECT 的短响应（拒绝/错误）：空体 + 主动关连接。""" |
| 875 | self.send_response(code) |
| 876 | self.send_header("Content-Length", "0") |
| 877 | self.send_header("Connection", "close") |
| 878 | self.end_headers() |
| 879 | self.close_connection = True |
| 880 | |
| 881 | @staticmethod |
| 882 | def _tunnel(client, upstream): |