I'd add that this bug is very practical and can render a lot of software unusable/noisy/confusing on Windows, including Django (I discovered this bug when mentoring on Django Girls].

The simple step to reproduce is to take any windows and set regional settings to non-English (I've used Czech). You can verify that using "import locale; locale.getpreferredencoding()", that should display something else ("cp1250" in my case).

Then, set "name" (= hostname, in Windows settings) of the computer to anything containing non-ascii character (like "Didejo-noťas").

As Windows apparently encodes the hostname using their default encoding, it fails with

```
  File "C:\Python34\lib\wsgiref\simple_server.py", line 50, in server_bind
    HTTPServer.server_bind(self)
  File "C:\Python34\lib\http\server.py", line 135, in server_bind
    self.server_name = socket.getfqdn(host)
  File "C:\Python34\lib\socket.py", line 463, in getfqdn
    hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x9d in position 9: invalid
start byte
```