Under Construction & block other pages in CI

The old version of Community Auth had a maintenance mode implementation that would show everyone a "Site Down for Maintenance" page, but allowed the developers full access to the site. Most of this functionality was a customization of the front controller (index.php).

See here:

https://bitbucket.org/skunkbad/community...ew-default

The important thing when serving up the maintenance mode page is to set a 503 status header. This is the page that Community Auth would serve up:

https://bitbucket.org/skunkbad/community...ew-default

Im trying your code.
I can see you written for code igniter 2.2.2 in the maintenance-mode.php, Is it best practice for version 3.0.6 as well?