Re: [whatwg/fetch] Define the "Preload Cache" (#590)

Yes.

In Blink, there is one memory cache in a renderer process, and only the main thread can use it. That means workers don't have access to the memory cache. There is one preload cache for each environment settings object. That means a preloaded resource is only matched in the preload cache with a request initiated by the same document. Please note that the preloaded resource can be matched in the memory cache with a request initiated by a different document - but the matching criteria (e.g., `cache-control: no-store`) and the matching status (e.g.., whether we show the unused preload warning) are different from the preload cache case.




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