Add Page.get_route_paths() to support redirect creation for alternative routes

wagtail/core/models/__init__.py

@@ -1678,6 +1678,28 @@ class Page(AbstractPage, index.Indexed, ClusterableModel, metaclass=PageBase):
         patch_cache_control(response, private=True)
         return response
 
+    def get_route_paths(self):
+        """
+        .. versionadded:: 2.16
+
+        Returns a list of paths that this page can be viewed at.
+
+        These values are combined with the dynamic portion of the page URL to
+        automatically create redirects when the page's URL changes.
+
+        .. note::
+
+            If using ``RoutablePageMixin``, you may want to override this method
+            to include the paths of popualar routes.
+
+        .. note::
+
+            Redirect paths are 'normalized' to apply consistant ordering to GET parameters,
+            so you don't need to include every variation. Fragment identifiers are discarded
+            too, so should be avoided.
+        """
+        return ['/']
+
     def get_cached_paths(self):
         """
         This returns a list of paths to invalidate in a frontend cache