OnlineCacheInterceptor.java

public class OnlineCacheInterceptor implements Interceptor {

    @Override
    public okhttp3.Response intercept(Chain chain) throws IOException {
        okhttp3.Response response = chain.proceed(chain.request());
        CacheControl cacheControl = new CacheControl.Builder()
                .maxAge(30, TimeUnit.SECONDS)
                .build();
        return response.newBuilder()
                .header("Cache-Control", cacheControl.toString())
                .build();
    }
}