Google's service include GCM can not access in my country.Can Service Worker push notification without gcm in chrome? Or if some hack technique can implement this?
Nick Searle
Chrome now also uses Firebase Cloud Messaging as its Push Service, which may be available in your country. You could also use a third party Push Notification platform. These would still need to access GCM or FCM but they might have some ways to get access in restricted areas. Just do a search for "push notification third party" to get a list of them.
Also see this answer and this one for more information. Be aware they are outdated, but the concepts are the same.
来源：https://stackoverflow.com/questions/40167227/can-service-worker-push-notification-without-gcm-in-chrome