from django.utils.cache import get_cache_key
from django.core.cache import cache
 
class CachePurgeMiddleware(object):
    def process_request(self, request):
        if 'purge' in request.session:
            k = get_cache_key(request)
            try:
                cache.delete(k)
            except:
                pass
            del request.session['purge']