Commits on Apr 20, 2023

1. Support stale-while-revalidate …

   stale-while-revalidate allows resources that are accessed often to be refreshed asynchronously.
   
   This is implemented by a new freshness state that returns the cached response, but triggers an asynchronous request that gets stored in the cache.
   
   ## Example
   
   If we need to call an external service to generate short-lived user JWT tokens (e.g., valid for a minute)
   
   Imagine this request is slow and needs to be cached so the app is more responsive. However I we don't want the app to hang every minute when the JWT token expires, so it needs to be refreshed asynchronously.
   
   Instead of returning `cache-control: max-age=60`, it can now return `cache-control: max-age=30, stale-while-revalidate=30`, so that JWT tokens for users making frequent requests are regenerated every ~30s.
   
   (If the user stays away for over a minute the next request will be slower)

   

   paulo-raca committed Apr 20, 2023
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2. Detach asynchronous request from current context

   

   paulo-raca committed Apr 20, 2023
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