Codeigniter showing error when I try to resubmit f

问题:

My CI website has csrf protection.

$config['csrf_protection'] = TRUE;

So, when I resubmit form by refresh I am getting the following error.

The action you have requested is not allowed

Instead of showing this message, I want it to return to last page.

So, I try to override csrf_show_error() method by extending the CI_Security file.

This is my class located in application/core/My_Security.php

class MY_Security extends CI_Security {

    public function __construct()
    {
        parent::__construct();
        $this->load->library('user_agent');
    }

    public function csrf_show_error()
    {
        // show_error('The action you have requested is not allowed.');  // default code

        // force page "refresh" - redirect back to itself 
        // a page refresh restores the CSRF cookie      
        if ($this->agent->is_referral())
        {
            redirect(site_url());

        } else {            
            redirect($_SERVER['HTTP_REFERER']);         
        }        
    }
}

I am getting the following error

Call to a member function library() on a non-object

回答1:

Insted of changing the core classes, I extended the MY_Securtiy class in core folder of application. and redirecting to past page.

File Location: application\core\MY_Security.php

class MY_Security extends CI_Security {

    public function __construct()
    {
        parent::__construct();      
    }

    public function csrf_show_error()
    {
        header('Location: ' . htmlspecialchars($_SERVER['REQUEST_URI']), TRUE, 200);
    }
}

回答2:

Thanks for your solution, but it seems better with a return code 302 by changing the request type of the new request to GET, regardless of the type employed in the original request (e.g. POST). The next refresh will not ask any question.