how to get the raw response in retrofit2 instead of POJO

Question

I am using Retrofit2 for all the network calls in my android application. Im configuring a POJO for a particular response. But I want to just check the raw Json repsonse for some extra response which is not included as a variable in POJO.

POJO

public class User {

  @SerializedName("user_id")
  private long userId;

  @SerializedName("user_name")
  private String userName;

  @SerializedName("hobbies")
  private String hobbies;

  @SerializedName("class")
  private String studyClass;

  @SerializedName("branch_id")
  private long branchId;

  @SerializedName("createdOn")
  private Date createdOn;
}

My network interface

public interface ApiInterface {

  @GET("user/{userId}")
  Call<User> getUserInfo(@Path("userId") long userId);
}

My code for requesting the data .

if (retrofit == null) {
        retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create(gson))
                .build();
    }
ApiInterface apiService = retrofit.create(ApiInterface.class);
Call<User> call = apiService.getUserInfo(userId);
    call.enqueue(new Callback<User>() {
        @Override
        public void onResponse(Call<User> call, Response<User> response) {
            User user = response.body();
            setViews(user);
        }

        @Override
        public void onFailure(Call<User> call, Throwable t) {
            Toast.makeText(getApplicationContext(), "On failure while requesting server", Toast.LENGTH_LONG).show();
        }
    });

How to check the raw response . But I want the interface method to return the POJO.