How to Make Resource Load From Memory Cache

[Hao Liu]

Hi all,

I'm writing a wpt for test the scenario where a resource is loaded from memory cache.

I did a page that fetches a js file twice. but the second time is loaded from disk cache. 

How can I make it (from memory cache)

like this?

Thanks!

[Dominic Farolino]

I'm not sure if the memory cache is well-defined enough to rely on a resource coming from the memory cache vs the disk cache at this point, so I'm not sure how interoperable the test would be. I think nrosenthal@ would have a good idea these days so let me loop him in here.

[Kenichi Ishibashi]

Some non-wpt web_tests use Internals.isLoadingFromMemoryCache() to check whether a resource is loaded from the memory cache. I don't know what's the criteria to serve a request from memory cache, but you may want to write a non-wpt web_tests in a way similar to these tests (e.g. image-value-cached.html).

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[Noam Rosenthal]

(Reposting, for some reason I'm not seeing it in the thread, hope it's not spamming)

I've been trying to write tests that cover this a while back:

https://github.com/web-platform-tests/wpt/pull/32833

And also trying to move the spec discussion forward:

https://github.com/whatwg/html/issues/6110

https://github.com/whatwg/fetch/issues/1400

My conclusion so far is that the memory cache is very non-interoperable and also relies on implementation-specific memory availability, which makes it very difficult to predict.

I hope that we can, at some point, spec how it works with resource-timing and with CSP, as those are observable aspects of that feature.

On Wednesday, July 27, 2022 at 7:43:50 AM UTC+3 Kenichi Ishibashi wrote:

Some non-wpt web_tests use Internals.isLoadingFromMemoryCache() to check whether a resource is loaded from the memory cache. I don't know what's the criteria to serve a request from memory cache, but you may want to write a non-wpt web_tests in a way similar to these tests (e.g. image-value-cached.html).

On Wed, Jul 27, 2022 at 10:26 AM Dominic Farolino <d...@chromium.org> wrote:

I'm not sure if the memory cache is well-defined enough to rely on a resource coming from the memory cache vs the disk cache at this point, so I'm not sure how interoperable the test would be. I think nrosenthal@ would have a good idea these days so let me loop him in here.

On Tuesday, July 26, 2022 at 8:42:23 PM UTC-4 Hao Liu wrote:

Hi all,

I'm writing a wpt for test the scenario where a resource is loaded from memory cache.

I did a page that fetches a js file twice. but the second time is loaded from disk cache. 

How can I make it (from memory cache)

like this?

Thanks!

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[Noam Rosenthal]

I've been trying to write tests that cover this a while back:

https://github.com/web-platform-tests/wpt/pull/32833

And also trying to move the spec discussion forward:

https://github.com/whatwg/html/issues/6110

https://github.com/whatwg/fetch/issues/1400

My conclusion so far is that the memory cache is very non-interoperable and also relies on implementation-specific memory availability, which makes it very difficult to predict.

I hope that we can, at some point, spec how it works with resource-timing and with CSP, as those are observable aspects of that feature.