安装¶

To install the redirects app, follow these steps:

1. Ensure that the django.contrib.sites framework is installed.
2. Add 'django.contrib.redirects' to your INSTALLED_APPS setting.
3. Add 'django.contrib.redirects.middleware.RedirectFallbackMiddleware' to your MIDDLEWARE setting.
4. Run the command manage.py migrate.

How it works¶

manage.py migrate creates a django_redirect table in your database. This is a simple lookup table with site_id, old_path and new_path fields.

The RedirectFallbackMiddleware does all of the work. Each time any Django application raises a 404 error, this middleware checks the redirects database for the requested URL as a last resort. Specifically, it checks for a redirect with the given old_path with a site ID that corresponds to the SITE_ID setting.

• If it finds a match, and new_path is not empty, it redirects to new_path using a 301 ("Moved Permanently") redirect. You can subclass RedirectFallbackMiddleware and set response_redirect_class to django.http.HttpResponseRedirect to use a 302 Moved Temporarily redirect instead.
• If it finds a match, and new_path is empty, it sends a 410 ("Gone") HTTP header and empty (content-less) response.
• If it doesn’t find a match, the request continues to be processed as usual.

The middleware only gets activated for 404s — not for 500s or responses of any other status code.

Note that the order of MIDDLEWARE matters. Generally, you can put RedirectFallbackMiddleware at the end of the list, because it’s a last resort.

For more on middleware, read the middleware docs.

How to add, change and delete redirects¶

中间件¶

class middleware.RedirectFallbackMiddleware¶

You can change the HttpResponse classes used by the middleware by creating a subclass of RedirectFallbackMiddleware and overriding response_gone_class and/or response_redirect_class.

response_gone_class¶

The HttpResponse class used when a Redirect is not found for the requested path or has a blank new_path value.

Defaults to HttpResponseGone.

response_redirect_class¶

The HttpResponse class that handles the redirect.

Defaults to HttpResponsePermanentRedirect.