gcm vs fcm endpoint selection

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i am trying to understand how browser chooses endpoint for push notification.

i think it selects based on browser but if i so then why sometimes it selects

https://fcm.googleapis.com/fcm/send/

and sometimes https://android.googleapis.com/gcm/send/

here is link

https://santa.pushalert.co/

when we allow notification we can see that it chooses android.googleapis.com but in there javascript i could not find anywhere android.googleapis.com but it shows in form data sent by browser. i want to move to latest one fcm.googleapis.com

direct me in right direction guys

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