Fixed #20667 - Removed discussion of DEBUG from tutorial.

Forward-port of 3493f18d78 from master.

docs/howto/deployment/checklist.txt

@@ -206,6 +206,21 @@ See :doc:`/howto/error-reporting` for details on error reporting by email.
 
     .. _Sentry: http://sentry.readthedocs.org/en/latest/
 
+Customize the default error views
+---------------------------------
+
+Django includes default views and templates for several HTTP error codes. You
+may want to override the default templates by creating the following templates
+in your root template directory: ``404.html``, ``500.html``, ``403.html``, and
+``400.html``. The default views should suffice for 99% of Web applications, but
+if you desire to customize them, see these instructions which also contain
+details about the default templates:
+
+* :ref:`http_not_found_view`
+* :ref:`http_internal_server_error_view`
+* :ref:`http_forbidden_view`
+* :ref:`http_bad_request_view`
+
 Miscellaneous
 =============
 

docs/intro/tutorial03.txt

@@ -454,51 +454,6 @@ just as :func:`~django.shortcuts.get_object_or_404` -- except using
 :meth:`~django.db.models.query.QuerySet.get`. It raises
 :exc:`~django.http.Http404` if the list is empty.
 
-Write a 404 (page not found) view
-=================================
-
-When you raise :exc:`~django.http.Http404` from within a view, Django
-will load a special view devoted to handling 404 errors. It finds it
-by looking for the variable ``handler404`` in your root URLconf (and
-only in your root URLconf; setting ``handler404`` anywhere else will
-have no effect), which is a string in Python dotted syntax -- the same
-format the normal URLconf callbacks use. A 404 view itself has nothing
-special: It's just a normal view.
-
-You normally won't have to bother with writing 404 views. If you don't set
-``handler404``, the built-in view :func:`django.views.defaults.page_not_found`
-is used by default. Optionally, you can create a ``404.html`` template
-in the root of your template directory. The default 404 view will then use that
-template for all 404 errors when :setting:`DEBUG` is set to ``False`` (in your
-settings module). If you do create the template, add at least some dummy
-content like "Page not found".
-
-.. warning::
-
-    If :setting:`DEBUG` is set to ``False``, all responses will be
-    "Bad Request (400)" unless you specify the proper :setting:`ALLOWED_HOSTS`
-    as well (something like ``['localhost', '127.0.0.1']`` for
-    local development).
-
-A couple more things to note about 404 views:
-
-* If :setting:`DEBUG` is set to ``True`` (in your settings module) then your
-  404 view will never be used (and thus the ``404.html`` template will never
-  be rendered) because the traceback will be displayed instead.
-
-* The 404 view is also called if Django doesn't find a match after checking
-  every regular expression in the URLconf.
-
-Write a 500 (server error) view
-===============================
-
-Similarly, your root URLconf may define a ``handler500``, which points
-to a view to call in case of server errors. Server errors happen when
-you have runtime errors in view code.
-
-Likewise, you should create a ``500.html`` template at the root of your
-template directory and add some content like "Something went wrong".
-
 Use the template system
 =======================
 

docs/intro/whatsnext.txt

@@ -66,6 +66,11 @@ different needs:
   where you'll turn to find the details of a particular function or
   whathaveyou.
 
+* If you are interested in deploying a project for public use, our docs have
+  :doc:`several guides</howto/deployment/index>` for various deployment
+  setups as well as a :doc:`deployment checklist</howto/deployment/checklist>`
+  for some things you'll need to think about.
+
 * Finally, there's some "specialized" documentation not usually relevant to
   most developers. This includes the :doc:`release notes </releases/index>` and
   :doc:`internals documentation </internals/index>` for those who want to add

docs/topics/http/views.txt

@@ -140,18 +140,18 @@ The 404 (page not found) view
 
 .. function:: django.views.defaults.page_not_found(request, template_name='404.html')
 
-When you raise an ``Http404`` exception, Django loads a special view devoted
+When you raise :exc:`~django.http.Http404` from within a view, Django loads a
-to handling 404 errors. By default, it's the view
+special view devoted to handling 404 errors. By default, it's the view
-``django.views.defaults.page_not_found``, which either produces a very simple
+:func:`django.views.defaults.page_not_found`, which either produces a very
-"Not Found" message or loads and renders the template ``404.html`` if you
+simple "Not Found" message or loads and renders the template ``404.html`` if
-created it in your root template directory.
+you created it in your root template directory.
 
 The default 404 view will pass one variable to the template: ``request_path``,
 which is the URL that resulted in the error.
 
 The ``page_not_found`` view should suffice for 99% of Web applications, but if
-you want to override it, you can specify ``handler404`` in your URLconf, like
+you want to override it, you can specify ``handler404`` in your root URLconf
-so::
+(setting ``handler404`` anywhere else will have no effect), like so::
 
     handler404 = 'mysite.views.my_custom_404_view'