Add is_https() as a common function
diff --git a/system/core/Config.php b/system/core/Config.php
index 8e4f998..e78128c 100644
--- a/system/core/Config.php
+++ b/system/core/Config.php
@@ -75,7 +75,7 @@
 		{
 			if (isset($_SERVER['HTTP_HOST']))
 			{
-				$base_url = ( ! empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off') ? 'https' : 'http';
+				$base_url = is_https() ? 'https' : 'http';
 				$base_url .= '://'.$_SERVER['HTTP_HOST']
 					.str_replace(basename($_SERVER['SCRIPT_NAME']), '', $_SERVER['SCRIPT_NAME']);
 			}