Google Cloud Messagingでプッシュ通知を送る

curl --header 'Authorization: key=＜APIキー＞' \
     --header Content-Type:"application/json" \
     https://android.googleapis.com/gcm/send \
     -d '{"registration_ids":["＜端末の登録ID＞"],"data":{"message":"Hello", "url": "http://www.example.com/"}}'