Codeigniter版本2.0.2重定向循环问题

I have moved from codeigniter 1.7 to 2.0 and so i replaced MY_Controller to CI_Controller and parent::MY_Controller(); to parent::__construct(); in login controller and from login controller view is loading and in that view I have added exit at start of the file its not a problem occurring due to other files.

Now, by this change my error for controller has gone, but the issue is I am having error for redirect loop.

If I have added exit before parent::__construct(); then it is working fine,but If i have added exit after parent::__construct();,its going to redirect loop.

There is nothing writter in my hook.php

My route php is 

$route['default_controller'] = "login";
$route["404_override"] = "";

 Codigniter version is 2.0.2

 LOGIN FILE ::


  /public_html/projectname/application/controller/login.php

 class Login extends CI_Controller
 {     

 function __construct()

{ echo "test";exit // Here,its working fine without going to loop

   parent::__construct();

    echo "test";exit // Here this will give redirect loop issue 

}

}

/public_html/projectname/.htaccess

 RewriteEngine on
 RewriteCond $1 !^(index\.php|resources|robots\.txt)
 RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule ^(.*)$ index.php/$1 [L,QSA]


 // route.php


 $route['default_controller'] = "login";
 $route["404_override"] = "";

Is your server shared or dedicated ?

If it is shared,then make sure that mod_rewrite is enabled on server otherwise it won't recognize htaccess file you have added and that may be the reason for redirect loop issue.

Please ask your hosting provider to make it enable (If it is disabled on shared server) and check !!