Re: [whatwg/fetch] Add Stale While Revalidate Handling (#853)

jakearchibald commented on this pull request.



> +         "<code>no-cache</code>".
+
+         <li><p>Set <var>revalidateRequest</var>'s
+         <a for=request>prevent no-cache cache-control header modification flag</a>.
+
+         <li><p>Set <var>revalidateRequest</var>'s <a for=request>service-workers mode</a> set to
+         "<code>none</code>".
+
+         <li>
+          <p><a>In parallel</a>, perform <a for=main>main fetch</a> using
+          <var>revalidateRequest</var>.
+
+          <p class=note>This fetch is only meant to update the state of the HTTP cache and the
+          response will be unused until another cache access. The stale response will be used as the
+          response to current request. This fetch is issued in the context of a client so if it goes
+          away the request will be terminated.

I'm also interested in what Gecko did, but given that contextless fetches are rare, I'm happy that the cache isn't updated for these resources (now it's in the spec)

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