Piwik\Tracker\Response::outputAccessControlHeaders PHP Method

    private function outputAccessControlHeaders()
    {
        if (!$this->isHttpGetRequest()) {
            $origin = isset($_SERVER['HTTP_ORIGIN']) ? $_SERVER['HTTP_ORIGIN'] : '*';
            Common::sendHeader('Access-Control-Allow-Origin: ' . $origin);
            Common::sendHeader('Access-Control-Allow-Credentials: true');
        }
    }