classification
Title: Suggested change to http.server.HTTPServer to prevent socket reuse in Windows
Type: behavior Stage:
Components: Library (Lib) Versions: Python 3.8
process
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: Michael Rich
Priority: normal Keywords:

Created on 2020-06-27 04:21 by Michael Rich, last changed 2020-06-27 04:21 by Michael Rich.

Messages (1)
msg372451 - (view) Author: Michael Rich (Michael Rich) Date: 2020-06-27 04:21
Hi, a web server can be incorrectly bound to an already in-use socket when binding a HTTPServer on windows.  The issue is discussed here:  https://stackoverflow.com/questions/51090637/running-a-python-web-server-twice-on-the-same-port-on-windows-no-port-already

This only happens on Windows.  In *nix the socketserver will throw an error, on Windows it will not.  However the most recently bound server will not receive the requests.

I suggest the following code (taken from stackoverflow) at the start of the server_bind method:

if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
            # Also need to change the value of allow_reuse_address (defined in http.server.HTTPServer)
            HTTPServer.allow_reuse_address = 0


I have tested this and it will throw an error upon reuse in Windows and does not change *nix behavior.

Thanks,

Mike
History
Date User Action Args
2020-06-27 04:21:05Michael Richcreate