How can the service-worker and cache storage API handle caching a redirect with an HTTP 302?

I need help with my website that is served over https from Tomcat and includes a service worker for fetching and storing resources in the cache. Everything works well when Tomcat is running, but I have run into an issue. My Tomcat configuration includes a redirectPort attribute to redirect http to https. The problem arises when Tomcat is not running - if the webpage is accessed via http, the browser displays a "Connection refused" error since the http 302 redirect is not cached. How can I address this issue?

Answer №1

For security reasons, service workers necessitate the use of https, therefore they are unable to intercept http requests.

If you wish to ensure that browsers access your page via https, you might consider implementing HSTS:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security

The browser can preload the HSTS list, enabling it to function even offline. However, caution is advised when enabling HSTS, as mistakes can be challenging to rectify.

Alternatively, modern browsers are gradually transitioning towards defaulting to https unless users explicitly specify http. For more information, refer to:

https://blog.chromium.org/2021/03/a-safer-default-for-navigation-https.html

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