From Http to Https - Now browser gives ERR_CONTENT_DECODING_FAILED error in console

I saw topic where you find such an advice. 
Have you at first tried solutions from this and this answers? 
Try those if you didn't (in order I posted those). 
Also for a while, there is sort of common functions used in custom created helper like in this page:

PHP Code:

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

if (!function_exists('force_ssl'))
{
    function force_ssl()
    {
        $CI =& get_instance();
        $CI->config->config['base_url'] =
                 str_replace('http://', 'https://',
                 $CI->config->config['base_url']);
        if ($_SERVER['SERVER_PORT'] != 443)
        {
            redirect($CI->uri->uri_string());
        }
    }
}

function remove_ssl()
{
    $CI =& get_instance();
    $CI->config->config['base_url'] =
                  str_replace('https://', 'http://',
                  $CI->config->config['base_url']);
    if ($_SERVER['SERVER_PORT'] != 80)
    {
        redirect($CI->uri->uri_string());
    }
}
/* End of file ssl_helper.php */
/* Location: ./application/helpers/ssl_helper.php *//// 


PHP Code:

$autoload['helper'] = array('url', 'ssl'); 


Then, within `public function __construct()` of every controller requiring SSL, add the following:

PHP Code:

force_ssl(); 


But check first if you can solve it on server level.