UnicodeEncodeError al cargar archivos en Django admin

Mi pregunta es similar a la que se informóaqu, pero la solución propuesta no funciona para mí. Estoy intentando subir un archivo llamado 'Testaråäö.txt' a través de la aplicación de administración de Django.

Estoy ejecutando Django 1.3.1 con Gunicorn 0.13.4 y Nginx 0.7.6.7 en un servidor Debian 6. La base de datos es PostgreSQL 8.4.9. Otros datos Unicode se guardan en la base de datos sin problemas, por lo que supongo que el problema debe estar relacionado con el sistema de archivos de alguna manera.

He configurado

http {
    charset utf-8;
}

in my nginx.conf. LC_ALL y LANG se establece en 'sv_SE.UTF-8'. Ejecutar 'locale' verifica esto. Incluso intenté configurar LC_ALL y LANG en mi script de inicio nginx solo para asegurarme de que la configuración regional esté configurada correctamente.

Aquí está el rastreo:

Traceback (most recent call last):

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/handlers/base.py", line 111, in get_response
response = callback(request, *callback_args, **callback_kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/options.py", line 307, in wrapper
return self.admin_site.admin_view(view)(*args, **kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 93, in _wrapped_view
response = view_func(request, *args, **kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/views/decorators/cache.py", line 79, in _wrapped_view_func
response = view_func(request, *args, **kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/sites.py", line 197, in inner
return view(request, *args, **kwargs)

File "/srv/django/letebo/app/cms/admin.py", line 81, in change_view
return super(PageAdmin, self).change_view(request, obj_id)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 28, in _wrapper
return bound_func(*args, **kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 93, in _wrapped_view
response = view_func(request, *args, **kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/utils/decorators.py", line 24, in bound_func
return func(self, *args2, **kwargs2)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/transaction.py", line 217, in inner
res = func(*args, **kwargs)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/options.py", line 985, in change_view
self.save_formset(request, form, formset, change=True)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/contrib/admin/options.py", line 677, in save_formset
formset.save()

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/forms/models.py", line 482, in save
return self.save_existing_objects(commit) + self.save_new_objects(commit)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/forms/models.py", line 613, in save_new_objects
self.new_objects.append(self.save_new(form, commit=commit))

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/forms/models.py", line 717, in save_new
obj.save()

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/base.py", line 460, in save
self.save_base(using=using, force_insert=force_insert, force_update=force_update)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/base.py", line 504, in save_base
self.save_base(cls=parent, origin=org, using=using)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/base.py", line 543, in save_base
for f in meta.local_fields if not isinstance(f, AutoField)]

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/fields/files.py", line 255, in pre_save
file.save(file.name, file, save=False)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/db/models/fields/files.py", line 92, in save
self.name = self.storage.save(name, content)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/files/storage.py", line 48, in save
name = self.get_available_name(name)

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/files/storage.py", line 74, in get_available_name
while self.exists(name):

File "/srv/.virtualenvs/letebo/lib/python2.6/site-packages/django/core/files/storage.py", line 218, in exists
return os.path.exists(self.path(name))

File "/srv/.virtualenvs/letebo/lib/python2.6/genericpath.py", line 18, in exists
st = os.stat(path)

UnicodeEncodeError: 'ascii' codec can't encode characters in position 52-54: ordinal not in range(128)

ACTUALIZAR Intenté ejecutar Gunicorn con la depuración activada y el archivo se carga sin ningún problema. Supongo que esto debe significar que el problema es con Nginx. Sin embargo, todavía me gana dónde mirar. Estos son los encabezados de respuesta sin formato de Gunicorn y Nginx, si tiene sentido:

Gunicornio:

HTTP/1.1 302 FOUND
Server: gunicorn/0.13.4
Date: Thu, 09 Feb 2012 14:50:27 GMT
Connection: close
Transfer-Encoding: chunked
Expires: Thu, 09 Feb 2012 14:50:27 GMT
Vary: Cookie
Last-Modified: Thu, 09 Feb 2012 14:50:27 GMT
Location: http://my-server.se:8000/admin/cms/page/15/
Cache-Control: max-age=0
Content-Type: text/html; charset=utf-8
Set-Cookie: messages="yada yada yada"; Path=/

Nginx:

HTTP/1.1 500 INTERNAL SERVER ERROR
Server: nginx/0.7.67
Date: Thu, 09 Feb 2012 14:50:57 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: close
Vary: Cookie

500

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