OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
  .url("https://fassetchain-dev.fingerservice.co.kr:28080")
  .post(body)
  .addHeader("accept", "application/json")
  .addHeader("Authorization", "Bearer "),
  .addHeader("content-type", "application/json")
  .build();

Response response = client.newCall(request).execute();