remove_www_middleware.py

class RemoveWWW(object):
    def process_request( self, request ):
        try:
            if request.META['HTTP_HOST'].lower().find('www.') == 0:
                from django.http import HttpResponsePermanentRedirect
                return HttpResponsePermanentRedirect( request.build_absolute_uri().replace('//www.', '//') )
        except:
            pass
        return None