我认为没有错误.

烧瓶可能正在捕获所有异常，以便不停止主进程为应用程序提供服务.

As flask is probably catching all exceptions in order to do not stop the main process from serving the application.

正如您提到的，使用os._exit(0)即可完成工作.

As you mention, using os._exit(0) does the work.

据我所知，它被python2.7/SocketServer.py捕获:

As far as I've seen, it's catched by python2.7/SocketServer.py:

598         try:
599             self.finish_request(request, client_address)
600             self.shutdown_request(request)
601         except:
602             self.handle_error(request, client_address)
603             self.shutdown_request(request)

基本上可以捕获所有内容，但可以处理错误.

Which basically catches everything but handles an error.

顺便说一句:我是唯一一个认为可以通过try/except/finally进行重构的人吗?

BTW: Am I the only one who thinks that this could be refactored with a try/except/finally?