Access-Control-Allow-Origin is not showing up in response headers from codeigniter

Question

My Codeigniter file says

$CI->output->set_header(\"Access-Control-Allow-Origin: *\");
$CI->output->set_header(\"Access-Control-Expose-Headers: Ac         


        

Answer 1

after some digging around, i found that $CI->output->set_header() does work - when there isn't an error or exception.

When there is an error or exception that CI can catch, the output & view classes are bypassed completely and the appropriate error pages are rendered with include(VIEWPATH.'errors/'.$template.'.php') and headers sent with set_status_header($status_code) (located at /core/Common.php)

see /core/Exceptions.php

here's a sample:

    /**
     * General Error Page
     *
     * Takes an error message as input (either as a string or an array)
     * and displays it using the specified template.
     *
     * @param   string      $heading    Page heading
     * @param   string|string[] $message    Error message
     * @param   string      $template   Template name
     * @param   int     $status_code    (default: 500)
     *
     * @return  string  Error page output
     */
    public function show_error($heading, $message, $template = 'error_general', $status_code = 500)
    {
        set_status_header($status_code);

        $message = '
'.implode('
', is_array($message) ? $message : array($message)).'
';

        if (ob_get_level() > $this->ob_level + 1)
        {
            ob_end_flush();
        }
        ob_start();
        include(VIEWPATH.'errors/'.$template.'.php');
        $buffer = ob_get_contents();
        ob_end_clean();
        return $buffer;
    }

it's annoying in that it makes DRY less straight forward. to work around it, i suggest you create a helper function, for example (untested):

function my_generate_headers($headers=array(),$useOutputClass=true)
{
    if(is_array($headers) && count($headers)<1) return false;

    foreach($headers AS $eHeader)
    {
        ($useOutputClass) ? 
                    get_instance()->output->set_header('X-Powered-By: C-C-C-Cocaine') : 
                    @header('X-Powered-By: Errors',true);
    }

    return true;
}

use that function in your different error pages at /errors/error_*.php as well as in your controllers.