class HSTS{
 
        public static $maxAge = 31536000;
 
        /**
         * Enables HSTS.
         */
        public static function enable() {
            if (Detector::getHttps() === true) {
                header('Strict-Transport-Security: max-age='.self::$maxAge);
            } else {
                $httpsURL = 'https://'.$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
                if( count( $_POST )>0 )
                    die( 'Page should be accessed with HTTPS, but a POST Submission has been sent here. Adjust the form to point to '.$httpsURL );
                if( !isset( $_SERVER['HTTPS'] ) || $_SERVER['HTTPS']!=='on'){
                    if( !headers_sent() ){
                        header( "Status: 301 Moved Permanently" );
                        header( "Location: $httpsURL" );
                        exit();
                    }else{
                        die( '<script type="javascript">document.location.href="'.$httpsURL.'";</script>' );
                    }
                }
            }
        }
    }

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