How to get cache using HttpUrlConnection?

Question

Java

Happy New Year to all!!!
In the Application class I do the following:

try {
            File httpCacheDir = new File(getCacheDir(), "http");
            long httpCacheSize = 30 * 1024 * 1024; // 30 MiB
            HttpResponseCache.install(httpCacheDir, httpCacheSize);
        } catch (IOException e) {
            if(BuildConfig.DEBUG)
                Log.v("my app", "HTTP response cache installation failed:" + e);
        }

I use HttpUrlConnection to get data from the server.

URL url = new URL("some url addess");
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setUseCaches(true);
        urlConnection.setDoInput(true);
        urlConnection.addRequestProperty("Cache-Control", "max-state=2419200");
        InputStream inputStream = urlConnection.getInputStream();

I get an error:
libcore.io.ErrnoException: connect failed: ENETUNREACH (Network is unreachable) Can
you please tell me how to use the cache in the absence of the Internet?
Thank you!