How do I send a FCM message?

FCM also has a Console where you can send the Message/Notification from, without having your own app server. NOTE: Creating your own app server is up to you. Just stating that you can send a message/notification via the console. The URL used is “https://android.googleapis.com/gcm/send” .

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Which server does Firebase use?

Firebase includes an easy-to-use hosting service for all of your static files. It serves them from a global CDN with HTTP/2 . And to make your development particularly painless, Firebase hosting utilizes Superstatic, which you can run locally for all of your testing.24 Eki 2016

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