Get raw HTTP response with Retrofit

To get access to the raw response, use ResponseBody from okhttp as your call type.

Call<ResponseBody> login(...)

In your callback, you can check the response code with the code method of the response. This applies to any retrofit 2 return type, because your callback always gets a Response parameterized with your actual return type. For asynchronous —

Call<ResponseBody> myCall = myApi.login(...)
myCall.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Response<ResponseBody> response, Retrofit retrofit) {
        // access response code with response.code()
        // access string of the response with response.body().string()
    }

    @Override
    public void onFailure(Throwable t) {
        t.printStackTrace();
    }
});

for synchronous calls —

Response<ResponseBody> response = myCall.execute();
System.out.println("response code" + response.code());