SW Sample: Caching of Selective Resources

[jeffposnick]

It should demonstrate basic registration, and then an onfetch handler that selectively caches responses based on multiple criteria:

• Request URL pattern (e.g. only cache URLs hosted on example.com)
• Response MIME type (e.g. only cache image/* resposnes). Subsequent requests for the same URL are served from the cache.
• Any other ideas?

Until the native Caches API is available, it should use https://github.com/coonsta/cache-polyfill

[gauntface]

• Check the response code is 200.
• Cache Google Fonts.
• Only cache resources requested from pages that we have cached during the install step.