any of this functionality, you'll need to implement this in your C<< .psgi >>
file yourself.
+An apply_default_middlewares method is supplied to wrap your application
+in the default middlewares if you want this behaviour and you are providing
+your own .psgi file.
+
=head1 SEE ALSO
L<Catalyst::Upgrading>, L<Plack>, L<PSGI::FAQ>, L<PSGI>.