被动回复消息，回复多个图片消息会重复发送同一张图片

[Rainflow]

我的代码：

日志如下：
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/socketserver.py", line 320, in _handle_request_noblock
self.process_request(request, client_address)
File "/usr/local/lib/python3.6/socketserver.py", line 351, in process_request
self.finish_request(request, client_address)
File "/usr/local/lib/python3.6/socketserver.py", line 364, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/local/lib/python3.6/socketserver.py", line 724, in init
self.handle()
File "/usr/local/lib/python3.6/wsgiref/simple_server.py", line 133, in handle
handler.run(self.server.get_app())
File "/usr/local/lib/python3.6/wsgiref/handlers.py", line 144, in run
self.close()
File "/usr/local/lib/python3.6/wsgiref/simple_server.py", line 35, in close
self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'

[Rainflow]

解决方案：
把回复图片的逻辑放在子线程中执行，然后先回复给微信服务器一个空串。
问题原因：
微信服务器重发了用户的消息。
不理解的地方：
在5s内回复图片消息之后，好像还要回复一个空串才行，不然微信还是会重发

[Rainflow]

solved