Getting Header from Response (Retrofit / OkHttp Client)

I am using Retrofit with the OkHttp Client and Jackson for Json Serialization and want to get the header of the response.

I know that i can extend the OkClient and intercept it. But this comes before the deserialization process starts.

What i basically needs is to get the header alongside with the deserialized Json Object.

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>>

In Retrofit 2.0.0, you can get header like this:

public interface Api {
    @GET("user")
    Call<User> getUser();
}

Call<User> call = api.getUser();
call.enqueue(new Callback<User>() {
    @Override
    public void onResponse(Call<User> call, Response<User> response) {
        // get headers
        Headers headers = response.headers();
        // get header value
        String cookie = response.headers().get("Set-Cookie");
        // TODO
    }

    @Override
    public void onFailure(Call<User> call, Throwable t) {
        // TODO
    }
});