Consumir WebService con retrofit 2 en Android

//Interface public interface API { @GET("getCurrent") Call<CurrentPrice> getCurrent(); } //Integración con OkHttpClient public class RestBase { private static final String BASE_URL = "http://..."; private static API REST_CLIENT; static { setupRestBase(); } private RestBase() {} public static API getApiService() { return REST_CLIENT; } public static void setupRestBase() { OkHttpClient client = getHttpClient().build(); Retrofit retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) .client(client) .addConverterFactory(GsonConverterFactory.create()) .build(); REST_CLIENT = retrofit.create(API.class); } private static OkHttpClient.Builder getHttpClient() { OkHttpClient.Builder httpClient = new OkHttpClient.Builder(); httpClient.addInterceptor(new Interceptor() { @Override public Response intercept(Chain chain) throws IOException { Request original = chain.request(); Request request = original.newBuilder() .header("Accept", "application/json") .header("Authorization", "auth-token") .method(original.method(), original.body()) .build(); Response response = chain.proceed(request); return response; } }); return httpClient; } } //Uso /*Call<CurrentPrice> call = RestBase.getApiService().getCurrent(); call.enqueue(new Callback<CurrentPrice>() { @Override public void onResponse(retrofit2.Call<CurrentPrice> call, Response<CurrentPrice> response) { Log.d("APP", "Consulta correcta: " + response.body()); } @Override public void onFailure(retrofit2.Call<CurrentPrice> call, Throwable t) { Log.d("APP", "Consulta fallida " + t.getMessage()); } });*/