How to Enable Offline Caching with Retrofit and OkHttp?

Caching with Retrofit and OkHttp in Offline Mode

When utilizing Retrofit in conjunction with OkHttp, you may encounter difficulties in accessing cached data when offline. One possible issue lies in the server response headers. To enable OkClient to retrieve data from the cache, the server response must include the Cache-Control: public header.

To address this issue, ensure that your server is configured to send the appropriate headers. You can also leverage request interceptors to dynamically set the Cache-Control header based on your connectivity status. This approach allows you to request data from the network when available or fall back to cached data when offline.

Refactor for Retrofit 2.x

In Retrofit 2.x, HttpResponseCache is replaced by Cache, and setResponseCache is renamed as setCache. To update your code, make the following adjustments:

<code class="java">Cache cache = new Cache(httpCacheDirectory, 10 * 1024 * 1024);
OkHttpClient okHttpClient = new OkHttpClient();
if (cache != null) {
    okHttpClient.setCache(cache);
}</code>

Additional Considerations

Besides server response headers, there are other factors to consider for successful caching:

• Add Request Header: To prioritize network requests over cached data, add the Cache-Control: max-age=0 header to your request.
• Interceptor for Cache Control: Implement an interceptor to control the caching behavior based on the network availability.

By addressing the server headers and following these guidelines, you can effectively leverage caching to improve the performance and reliability of your offline Retrofit applications.

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