The redirect_uri URL must be absolute (Facebook login using php in localhost)

this is my config.php how to redirect it to facebook from localhost? since localhost don't have "http://" ?

when I want to login and press the button. it said "The redirect_uri URL must be absolute"

<?php
/*!
* HybridAuth
* http://ift.tt/nY1Kzk | http://ift.tt/1N8G6LP
* (c) 2009-2012, HybridAuth authors | http://ift.tt/1B1PUkv
*/

// ----------------------------------------------------------------------------------------
//  HybridAuth Config file: http://ift.tt/1N8G6LT
// ----------------------------------------------------------------------------------------
$config =array(
        "base_url" => "hybridauth/index.php", 
        "providers" => array ( 

            "Google" => array ( 
                "enabled" => true,
                "keys"    => array ( "id" => "XXXXXXXXXXXX", "secret" => "XXXXXXXX" ), 
            ),

            "Facebook" => array ( 
                "enabled" => true,
                "keys"    => array ( "id" => "XXXXXXXXXXXX", "secret" => "XXXXXXXXXXXX" ), 
            ),

        "Twitter" => array ( 
            "enabled" => true,
            "keys"    => array ( "key" => "XXXXXXXX", "secret" => "XXXXXXX" ) 
        ),
    ),
    // if you want to enable logging, set 'debug_mode' to true  then provide a writable file by the web server on "debug_file"
    "debug_mode" => false,
    "debug_file" => "debug.log",
);