Only show key_fields in error message
This caused a crash when GET, POST, and context were added to
the django_args by the decorators.
Patch by: Sverre Rabbelier
"Decorator for views that gzips pages if the client supports it."
from django.utils.decorators import decorator_from_middleware
from django.middleware.gzip import GZipMiddleware
gzip_page = decorator_from_middleware(GZipMiddleware)