GCM, FCM 서버에서 데이터 전송 형태

참조: https://developers.google.com/cloud-messaging/http-server-ref

GCM 전송 주소: https://android.googleapis.com/gcm/send

FCM 전송 주소: https://fcm.googleapis.com/fcm/send

header : Content-Type : application/json Authorization : key="{서버 API키}" body : { "content_available":true, "notification":{ "sound":"default", "title":"{title string}", "body":"{message string}" } "to": "push token", {"registration_ids":["token1", "token2",...],} "data": { "param1":value1, "param2":value2, } }