How to make your own PUSH server for ServiceWorker?

Question

JavaScript

Help to understand a bunch of technologies. Now I'm reading Push API, Notification API, Service Worker API.
I understood everything, except for the PUSH API. How it works? Do I have to use Firebase Cloud Messaging (FCM) or can I write my own PUSH server? How to do it? Perhaps there are ready? Where to dig? You need a server that you can work with Service Worker. What is the communication protocol? WAMP?
Help structure this data.

Answer 1

Ha ha ha. No, you can't have yours. Only those that support the browser.
Stanislav Pochepko , this is all very complicated, but you can read a bunch of articles on setting up push api, for example https://medium.com/web-standards/implement-push-uve... where you will stumble upon the concept of VAPID Key.
VAPID Key is a key where information about your message delivery service is encrypted.
And many recommend using https://firebase.google.com/docs/cloud-messaging/ (or you can use Amazon SNS https://aws.amazon.com/en/sns/faqs/)
all message sending points for each device and will send your message.
After all, each end device or browser is rigidly subscribed to these same points for receiving push notifications.