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サーバからFCMを要求

/** body 소스 */
okhttp3.RequestBody body = new FormBody.Builder()
                          .add("to",Token)
                          .add("project_id", 발신자 ID)
                          .add("notification","")
                          .build();

/** Request 소스 */
Request request = new Request.Builder()
		.url("https://fcm.googleapis.com/fcm/send")
                .addHeader("Authorization","key="+ 서버키)
                .post(body)
                .build();

OkHttpClient client = new OkhttpClient.Builder().build();

client.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e){
    	System.out.println(e.getMessage() + "\n	ERROR" );
    }
    
    @Override
    public void onResponse(Call call, Response response) throws IOException{
    	if(response.isSuccessful()){
        	System.out.println(response.code() + "\n" + response.body().string() + "\n SUCCESS");
        }
        else{
        	System.out.println(response.body().string());
        }
    }
});