retrofit把gson解析都封裝好了，url和response這些都變得不可見了，但是我們可以通過攔截的方式獲取到，代碼如下：

OkHttpClient.Builder builder = new OkHttpClient.Builder();
        builder.connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
        builder.addInterceptor(new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request originalRequest = chain.request(); //Current Request

                Response response = chain.proceed(originalRequest); //Get response of the request

                /** DEBUG STUFF */
                if (BuildConfig.DEBUG) {
                    //I am logging the response body in debug mode. When I do this I consume the response (OKHttp only lets you do this once) so i have re-build a new one using the cached body
                    String bodyString = response.body().string();
                    System.out.println(String.format("Sending request %s with headers %s ", originalRequest.url(), originalRequest.headers()));
                    System.out.println(String.format("Got response HTTP %s %s \n\n with body %s \n\n with headers %s ", response.code(), response.message(), bodyString, response.headers()));
                    response = response.newBuilder().body(ResponseBody.create(response.body().contentType(), bodyString)).build();
                }

                return response;
            }
        });


        retrofit = new Retrofit.Builder()
                .client(builder.build())
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .baseUrl(BASE_URL)
                .build();

其實就在okhttp里添加一個攔截器，把request和response 都輸出出來