Unicodedecodeerror with runserver

Question

After setting up all what django requires, I tried the runserver command and I caught an error:

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcf in position 8: invalid continuation byte

From:

c:\sue>python manage.py runserver
Validating models...

0 errors found
April 16, 2014 - 15:02:42
Django version 1.6.2, using settings 'sue.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x0000000003890048>
Traceback (most recent call last):
  File "C:\python34\lib\site-packages\django\utils\autoreload.py", line 93, in wrapper fn(*args, **kwargs)
  File "C:\python34\lib\site-packages\django\core\management\commands\runserver.py", line 127, in inner_run ipv6=self.use_ipv6, threading=threading)
  File "C:\python34\lib\site-packages\django\core\servers\basehttp.py", line 167, in run httpd = httpd_cls(server_address, WSGIRequestHandler, ipv6=ipv6)
  File "C:\python34\lib\site-packages\django\core\servers\basehttp.py", line 109, in __init__ super(WSGIServer, self).__init__(*args, **kwargs)
  File "C:\python34\lib\socketserver.py", line 430, in __init__ self.server_bind()
  File "C:\python34\lib\site-packages\django\core\servers\basehttp.py", line 113, in server_bind super(WSGIServer, self).server_bind()
  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 137, in server_bind
    self.server_name = socket.getfqdn(host)
  File "C:\python34\lib\socket.py", line 460, in getfqdn
    hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xcf in position 8: invalid continuation byte

I am using Windows 7 x64, python 3.4 and django 1.6.2. What does this error mean?

Possibly a configuration file is in a non UTF-8 character set? — DNA
– DNA, Commented Apr 16, 2014 at 12:29

vz0 · Accepted Answer · 2014-04-16 12:31:20Z

14

This sounds like this Python issue. If your computer name has non-ASCII characters this will fail. You may:

Issue the runserver command with explicit host and port: python manage.py runserver 127.0.0.1:8000
Change your computer name to a string that only contains ASCII characters.

answered Apr 16, 2014 at 12:31

vz0

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Adam Barnes · Accepted Answer · 2016-08-12 16:32:19Z

1

I just had this issue because I accidentally visited the site with https instead of http. Switching back to http fixed it.

answered Aug 12, 2016 at 16:32

Adam Barnes

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Comments

gileri · Accepted Answer · 2017-07-05 11:01:16Z

0

I hit this issue on python 3.4 with the following situation :

Server did have an ascii-only hostname (like host1)
The /etc/hosts file did not contain an entry for my hostname
There was no available DNS resolver (offline computer)

After adding the following entry to the /etc/hosts file, no further UnicodeDecodeError exceptions were thrown.

127.0.0.1 localhost host1

answered Jul 5, 2017 at 11:01

gileri

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