Posted on Sept. 18, 2012
Caching in Django is elegant and simple, especially the site-wide cache for anonymous users. But if you use Google Analytics and other external cookies, it might not be working the way you intended. Read this tutorial to find out how to make your site as fast as it can be.
By enabling the site-wide cache in Django, you probably intended for pages every page to be cached for every anonymous users. That's the point, at least. The problem is, the page cache is set to
Vary: Cookie. That means that if you have a session cookie or anything of the like, the cache will be different for each user.
Fortunately, that's not a problem with Django itself, since anonymous users won't have cookies set. But it is a problem if you're using Google Analytics. That's because Google Analytics sets cookies that trigger the site-wide cache's
Vary: Cookie condition. Luckily, fixing this is as easy as using a small piece of middleware and a touch of inheritance.
Let's create a new middleware file, call it
middleware.py and place it in your project root. Add the following snippet to the file1:
1 2 3 4 5 6 7 8 9 10 11
from django.middleware.cache import UpdateCacheMiddleware import re class SmartUpdateCacheMiddleware(UpdateCacheMiddleware): STRIP_RE = re.compile(r'\b(_[^=]+=.+?(?:; |$))') def process_request(self, request): cookie = self.STRIP_RE.sub('', request.META.get('HTTP_COOKIE', '')) request.META['HTTP_COOKIE'] = cookie
So what does this do? It replaces the middleware that comes with Django. Before passing on the cookies to the rest of the application, it strips out the cookies set by Google Analytics. That way, the
Vary: Cookie condition won't be triggered, as your application won't see any of these cookies. To deploy these changes, simply find your middleware classes in settings.py, and replace
middleware.SmartUpdateCacheMiddleware. Your middleware settings should look like so:
1 2 3 4 5
MIDDLEWARE_CLASSES = ( 'middleware.SmartUpdateCacheMiddleware', # All your other middleware. 'django.middleware.cache.FetchFromCacheMiddleware', )
And that's it. You're done.
please update the middleware.py file. It's not working...
This was written for Django 1.2. I believe Django changed its middleware structure around Django 1.10, so I'm not sure when this stopped working. The concepts might still apply though.
Laisser les choses évoluer dans le bon sens. panerai montres La contingence exige du vendeur qu’il ait un esprit flexible et qu’il fasse les choses comme il se doit, mais pas trop, afin que les gens puissent être convaincus, laissant ainsi une bonne impression au client, transformant les inconvénients en avantages. Le boîtier de la patek philippe montres est en titane. La conception en matériau léger rend la montre plus dynamique. Le diamètre de 47 mm est idéal pour les hommes aux poignets épais, et le matériau léger ne fait pas le poignet. La table est trop lourde.