Retrifit 2 redirect problem with changing POST into GET

Retrofit2RedirectProblem.java

package net.nerrd.alcoquiz;

import org.junit.Test;

import okhttp3.ResponseBody;
import okhttp3.mockwebserver.MockResponse;
import okhttp3.mockwebserver.MockWebServer;
import okhttp3.mockwebserver.RecordedRequest;
import retrofit2.Call;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.POST;

import static org.junit.Assert.assertEquals;

public class Retrofit2RedirectProblem {

    public final MockWebServer server = new MockWebServer();

    @Test
    public void test() throws Exception {
        final Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(server.url("/"))
                .build();

        final Service example = retrofit.create(Service.class);

        server.enqueue(new MockResponse()
                .setResponseCode(301)
                .addHeader("Location", "/device/register/"));
        server.enqueue(new MockResponse()
                .setResponseCode(200)
                .setBody("ok"));

        final Call<ResponseBody> call = example.search("xyz");
        final Response<ResponseBody> response = call.execute();

        final RecordedRequest firstRequest = server.takeRequest();
        final RecordedRequest redirectedRequest = server.takeRequest();

        assertEquals("/device/register/", redirectedRequest.getPath());
        assertEquals("POST", redirectedRequest.getMethod());
    }

    interface Service {
        @FormUrlEncoded
        @POST("device/register")
        Call<ResponseBody> search(@Field("token") String token);
    }
}