src/Fetch.php
static public function internalService($application_id, $service, $path, $params = []) {
        $url = "https://$service-dot-$application_id.appspot.com" . $path;
        return self::secureUrl($url, $params);
    }
static public function internalService($application_id, $service, $path, $params = []) {
        $url = "https://$service-dot-$application_id.appspot.com" . $path;
        return self::secureUrl($url, $params);
    }
static public function internalService ( $ application_id , $ service , $ path , $ params = [ ] ) { $ url = "https://$service-dot-$application_id.appspot.com" . $ path ; return self :: secureUrl ( $ url , $ params ) ; }
For internal service on Google App Engine. Basically just expands application and service
to the correct domain on App Engine. This url is the fastest url to use internally on
App engine, so this method is prefered for service to service communication.

@param $application_id
@param $service
@param $path
@param array $params
@return mixed
@throws \Exception
For internal service on Google App Engine . Basically just expands application and service to the correct domain on App Engine . This url is the fastest url to use internally on App engine so this method is prefered for service to service communication .