One particular user keeps submitting a request to my server that causes it to crash with an uncaptured python exception. Below is the request and corresponding error:

[2022-Jul-03 01:05] XXX.XX.XX.XXX  http /? 405 METHOD NOT ALLOWED
[2022-Jul-03 01:06] XXX.XX.XX.XXX GET http /nice ports,/Trinity.txt.bak? 404 NOT FOUND
[2022-Jul-03 01:06] XXX.XX.XX.XXX  http /? 405 METHOD NOT ALLOWED
ERROR:waitress:uncaptured python exception, closing channel <waitress.server.TcpWSGIServer listening XXX.XX.XXX.XX at XXXXXXXX> (<class 'OSError'>:[Errno 22] Invalid argument [/XXXX/XXXX/XXXX/waitress/wasyncore.py|read|104] /XXXX/XXXX/XXXX/waitress/wasyncore.py|handle_read_event|492] /XXXX/XXXX/XXXX/waitress/server.py|handle_accept|316] [/XXXX/XXXX/XXXX/waitress/server.py|set_socket_options|372])
WARNING:waitress:unhandled close event

My server is a Flask app running on a Mac OS with waitress 2.1.2. I glanced into the server.py code and it looks like an exception handler is supposed to catch this situation (at least for Linux), but it doesn't seem to be working (or more likely, I don't fully understand how it should work). The other odd thing is that the same request from the same user does not always trigger the error: sometimes the server continues even after receiving the 3 identical requests that precede the error message. I haven't yet figured out how to trigger the error myself, but it looks like the method is just an empty string (note the extra space after the IP address).

Thanks in advance!