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

annevk 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.

We're not, because the fetch algorithm covers all requests, not just those from `fetch()`, right? You can't ever have a `fetch()`-initiated fetch with a null client (except perhaps from browser-privileged code, but that's not specified).

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