Fixed #6213 -- Updated the flatpages app to only append a slash if the flatpage actually exist.

The FlatpageFallbackMiddleware (and the view) now only add a trailing slash and redirect if the resulting URL refers to an existing flatpage. Previously requesting /notaflatpageoravalidurl would redirect to /notaflatpageoravalidurl/, which would then raise a 404. Requesting /notaflatpageoravalidurl now will immediately raise a 404. Also, Redirects returned by flatpages are now permanent (301 status code) to match the behaviour of the CommonMiddleware.

Thanks to Steve Losh for the initial work on the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16048 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/contrib/flatpages.txt

@@ -77,6 +77,18 @@ does all of the work.
           :class:`~django.template.RequestContext` in rendering the
           template.
 
+    .. versionchanged:: 1.4
+       The middleware will only add a trailing slash and redirect (by looking
+       at the :setting:`APPEND_SLASH` setting) if the resulting URL refers to
+       a valid flatpage. Previously requesting a non-existent flatpage
+       would redirect to the same URL with an apppended slash first and
+       subsequently raise a 404.
+
+    .. versionchanged:: 1.4
+       Redirects by the middlware are permanent (301 status code) instead of
+       temporary (302) to match behaviour of the
+       :class:`~django.middleware.common.CommonMiddleware`.
+
     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