Getting Header from Response (Retrofit / OkHttp Client)

With Retrofit 1.9.0, if you use the Callback asynchronous version of the interface,

@GET("/user")
void getUser(Callback<User> callback)

Then your callback will receive a Response object

    Callback<User> user = new Callback<User>() {
        @Override
        public void success(User user, Response response) {

        }

        @Override
        public void failure(RetrofitError error) {

        }
    }

Which has a method called getHeaders()

    Callback<User> user = new Callback<User>() {
        @Override
        public void success(User user, Response response) {
            List<Header> headerList = response.getHeaders();
            for(Header header : headerList) {
                Log.d(TAG, header.getName() + " " + header.getValue());
            }
        }

For Retrofit 2.0’s interface, you can do this with Call<T>.

For Retrofit 2.0’s Rx support, you can do this with Observable<Result<T>>