EllisLab/CodeIgniter — pull request #1006 by duggan (2012-01-31 15:18:39+00:00)
Title: HTTPS detection fix

More closely follow the wording of the $_SERVER['HTTPS'] description in the PHP manual, which specifies a "non-empty" value rather than "non-null":

http://www.php.net/manual/en/reserved.variables.server.php