RestService::validateActivityHandler: Bitrix method

      
<?php 
//  Bitrix\Bizproc\RestService :: validateActivityHandler()
//  /dist/bitrix/modules/bizproc/lib/restservice.php:1453

    private static function validateActivityHandler($handler, $server)
    {
        $handlerData = parse_url($handler);

        if (is_array($handlerData)
            && strlen($handlerData['host']) > 0
            && strpos($handlerData['host'], '.') > 0
        )
        {
            if ($handlerData['scheme'] == 'http' || $handlerData['scheme'] == 'https')
            {
                $host = $handlerData['host'];
                $app = self::getApp($server);
                if (strlen($app['URL']) > 0)
                {
                    $urls = array($app['URL']);

                    if (strlen($app['URL_DEMO']) > 0)
                    {
                        $urls[] = $app['URL_DEMO'];
                    }
                    if (strlen($app['URL_INSTALL']) > 0)
                    {
                        $urls[] = $app['URL_INSTALL'];
                    }

                    $found = false;
                    foreach($urls as $url)
                    {
                        $a = parse_url($url);
                        if ($host == $a['host'] || $a['host'] == 'localhost')
                        {
                            $found = true;
                            break;
                        }
                    }

                    if(!$found)
                    {
                        throw new RestException('Handler URL host doesn\'t match application url', self::ERROR_HANDLER_URL_MATCH);
                    }
                }
            }
            else
            {
                throw new RestException('Unsupported event handler protocol', self::ERROR_UNSUPPORTED_PROTOCOL);
            }
        }
        else
        {
            throw new RestException('Wrong handler URL', self::ERROR_WRONG_HANDLER_URL);
        }
    }