Difference between disk and memory cache

[mishk0]

If the browser gets a file from its disk cache - it triggers a fetch event in SW, If gets from memory cache - it doesn't trigger a fetch. Is this behaviour according to spec? Reproduce it in Chrome (version 59.0.3071.115)

[wanderview]

I don't think chrome memory cache is spec'd. There are some memory caches that are spec'd, though, like image cache.

Related to integrating this stuff to SW see #962.

[jakearchibald]

The img cache is spec'd to come before service worker. Unfortunately, other memory caches, such as <link rel=preload> aren't spec'd, but I expect them to behave like <img> in terms of their cache relative to the service worker. Namely:

• Their caches come before the service worker. As in, you'll get no fetch event if there's a cache hit.
• Fetches generated by these things will go through the service worker.

Closing in favour of whatwg/fetch#354.