Cache OkHttpClient

BuildOkHttpClient

OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder()
    .cache(cache)
    .addInterceptor(new RewriteRequestInterceptor())
    .addNetworkInterceptor(new RewriteResponseCacheControlInterceptor())

RewriteRequestInterceptor

public class RewriteRequestInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        int maxStale = 60 * 60 * 24 * 5;
        Request request;
        if (NetworkUtils.isNetworkAvailable()) {
            request = chain.request();
        } else {
            request = chain.request().newBuilder().header("Cache-Control", "max-stale=" + maxStale).build();
        }
        return chain.proceed(request);
    }
}

RewriteResponseCacheControlInterceptor

public class RewriteResponseCacheControlInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        int maxStale = 60 * 60 * 24 * 5;
        Response originalResponse = chain.proceed(chain.request());
        return originalResponse.newBuilder().header("Cache-Control", "public, max-age=120, max-stale=" + maxStale).build();
    }
}