How to get response body to retrofit exception?

Try this code:

@Override
public void failure(RetrofitError error) {
    String json =  new String(((TypedByteArray)error.getResponse().getBody()).getBytes());
    Log.v("failure", json.toString());
}

with Retrofit 2.0

@Override
public void onFailure(Call<Example> call, Throwable t) {
    String message = t.getMessage();
    Log.d("failure", message);
}