CODING1

RestService restService;
    String baseUrl;

    public static RestService instance;

    public RetrofitHelper() {
        OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
        okHttpClientBuilder.readTimeout(RestConstant.CONNECTION_TIMEOUT, TimeUnit.MINUTES);
        okHttpClientBuilder.connectTimeout(RestConstant.CONNECTION_TIMEOUT, TimeUnit.MINUTES);
        okHttpClientBuilder.writeTimeout(RestConstant.CONNECTION_TIMEOUT, TimeUnit.MINUTES);

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);
        okHttpClientBuilder.addInterceptor(logging);

        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .addInterceptor(new Interceptor() {
                    @Override
                    public Response intercept(Chain chain) throws IOException {
                        Request request = chain.request().newBuilder().addHeader("Authorization", "Basic c3RsdXNlcjphbGZhY2FydFNUTDIzNDIzNA==").build();
                        return chain.proceed(request);
                    }
                })
                .connectTimeout(RestConstant.CONNECTION_TIMEOUT, TimeUnit.MINUTES)
                .readTimeout(RestConstant.CONNECTION_TIMEOUT, TimeUnit.MINUTES)
                .build();

        Gson gson = new GsonBuilder()
                .setLenient()
                .create();
        Retrofit retrofit = new Retrofit.Builder()
                .client(okHttpClient)
                .baseUrl(BuildConfig.HOST)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        restService = retrofit.create(RestService.class);
    }

    public RestService getService() {
        return restService;
    }

    public String getBaseUrl() {
        return baseUrl;
    }