$config['base_url'] BASE_URL

/*
|------------------------------------------------
| Base Site URL
|------------------------------------------------
|
| URL to your Code Igniter root. Typically this
| will be your base URL, WITH a trailing slash:
|
| http://www.your-site.com/
|
*/

$config['base_url'] = 'http://www.xxxx.com/';   // with 'http://'