redirect not working with 'REQUEST_METHOD' - codeigniter

Question

On my login controller, I am trying ($this->input->server('REQUEST_METHOD') == 'POST') for submitting form instead of codeigniter form_validation
But when I use redirect() it does not redirect.
Question: Why does the redirects not working when submitting form with ($this->input->server('REQUEST_METHOD') and what is the best solution to get it to work.
Update: Does not seem to submit the form because I use $config['uri_protocol'] = 'QUERY_STRING'; Instead of $config['uri_protocol'] = 'REQUEST_URI';
But need to use $config['uri_protocol'] = 'QUERY_STRING';
Routes.php
$route['route=common/login'] = 'admin/common/login/index';
$route['route=common/dashboard&token=(:any)'] = 'admin/common/dashboard/index';
$route['route=common/logout&token=(:any)'] = 'admin/common/logout/index';
Config.php
$config['base_url'] = 'http://localhost/project-cms/admin/';
$config['index_page'] = '';
$config['uri_protocol'] = 'QUERY_STRING';
Login Controller
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Login extends MX_Controller {
public function index()
{
if ($this->input->server('REQUEST_METHOD') == 'POST') {
$token = md5(mt_rand());
$url_token = '&token=' . $token;
echo "working";
//redirect('index.php?route=common/dashboard' . $url_token);
//$this->response->redirect($this->url->link('common/dashboard', $url_token, 'SSL'));
}
$data['action'] = $this->url->link('common/login', '', 'SSL');
$this->load->view('template/common/login', $data);
}
}
Login View
<form enctype="multipart/form-data" method="post" action="<?php echo $action;?>">
<input type="text" name="username" />
<input type="submit" value="Submit" />
</form>
Version: Codeigniter 3 & XAMPP With Windows 7

Answer 1

REQUEST_METHOD has nothing to do with your redirection issue.
You are using a wrong method to define routes.
$route['common/login'] = 'admin/common/login/index';
$route['common/dashboard/(:any)'] = 'admin/common/dashboard/index/$1';
$route['common/logout/(:any)'] = 'admin/common/logout/index/S1';
And you will get your token (in your controllers) as,
public function index($token)
{
echo $token;
}
And change your login controllers as,
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Login extends MX_Controller {
public function index()
{
if ($this->input->server('REQUEST_METHOD') == 'POST') {
$token = md5(mt_rand());
redirect('common/dashboard/' . $url_token);
}
$data['action'] = $this->url->link('common/login', '', 'SSL');
$this->load->view('template/common/login', $data);
}
}