django1/docs/ref/contrib/redirects.txt

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=================
The redirects app
=================
.. module:: django.contrib.redirects
:synopsis: A framework for managing redirects.
Django comes with an optional redirects application. It lets you store simple
redirects in a database and handles the redirecting for you.
Installation
============
To install the redirects app, follow these steps:
1. Add ``'django.contrib.redirects'`` to your :setting:`INSTALLED_APPS`
setting.
2. Add ``'django.contrib.redirects.middleware.RedirectFallbackMiddleware'``
to your :setting:`MIDDLEWARE_CLASSES` setting.
3. Run the command :djadmin:`manage.py syncdb <syncdb>`.
How it works
============
``manage.py syncdb`` 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
:setting:`SITE_ID` setting.
* If it finds a match, and ``new_path`` is not empty, it redirects to
``new_path``.
* 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 :setting:`MIDDLEWARE_CLASSES` matters. Generally, you
can put ``RedirectFallbackMiddleware`` at the end of the list, because it's a
last resort.
For more on middleware, read the :doc:`middleware docs
</topics/http/middleware>`.
How to add, change and delete redirects
=======================================
Via the admin interface
-----------------------
If you've activated the automatic Django admin interface, you should see a
"Redirects" section on the admin index page. Edit redirects as you edit any
other object in the system.
Via the Python API
------------------
.. class:: models.Redirect
Redirects are represented by a standard :doc:`Django model </topics/db/models>`,
which lives in `django/contrib/redirects/models.py`_. You can access redirect
objects via the :doc:`Django database API </topics/db/queries>`.
.. _django/contrib/redirects/models.py: https://github.com/django/django/blob/master/django/contrib/redirects/models.py