indexOf() === 0 could be startsWith

[domenic]

if (e.request.url.indexOf(dataUrl) === 0)

could be

if (e.request.url.startsWith(dataUrl))

Every browser that supports service workers supports startsWith.

[petele]

Hi!

Thanks for the feedback. I've rewritten the codelab from scratch and believe I have fixed this issue. The code has been updated, and the new guide is now live.

If you find any issues with the new codelab, please let us know!

Thanks!