How to cache ssr entry resource?

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• I'm submitting a bug report
• I'm submitting a feature request
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webpack version:
4.26

sw-precache-webpack-plugin version:
0.11.5

Please tell us about your environment:
Windows 10

Browser: [Phantom XX | Chrome XX | Firefox XX | IE XX | Safari XX | Other XX]
chromw v69
Current behavior:
Because my entry index page is rendered via SSR and is not packaged and generated.
All I want to cache is the SSR generated files, but I can't solve it very well in the configuration.

Expected/desired behavior:
Cache pages after SSR

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem along with your:

• Webpack configuration:

• Generated service worker (not minified):