Re: [whatwg/fetch] Deferred fetching (PR #1647)

@noamr commented on this pull request.



> +   <a for=request>body</a>'s <a for=body>length</a>.
+  </ol>
+ </li>
+
+ <li><p><a for=list>For each</a> <a>deferred fetch record</a> <var>deferredRecord</var> in
+ <var>request</var>'s <a for=request>client</a>'s <a for=fetch>fetch group</a>'s
+ <a for="fetch group">deferred fetch records</a>: if <var>deferredRecord</var>'s
+ <a for="deferred fetch record">request</a>'s <a for=request>body</a> is not null and
+ <var>deferredRecord</var>'s <a for="deferred fetch record">request</a>'s <a for=request>URL</a>'s
+ <a for=url>origin</a> is <a>same origin</a> with <var>request</var>'s <a for=request>URL</a>'s
+ <a for=url>origin</a>, then increment <var>totalScheduledDeferredBytesForOrigin</var> by
+ <var>deferredRecord</var>'s <a for="deferred fetch record">request</a>'s <a for=request>body</a>'s
+ <a for=body>length</a>.
+
+ <li><p>If <var>totalScheduledDeferredBytesForOrigin</var> is greater than 64 kilobytes, then
+ throw a {{QuotaExceededError}}.

We've talked about this before in this long issue discussion :)
- These request are implicitly keepalive, because they're never registered as fetch records. we don't actually set their keepalive to true in other ways.
- There is no point in sharing the regular keepalive quota. It would mean that origins would fight for that quota, and it is also unnecessary because the UA can simply delay the deferred fetches until all the keepalive fetches are complete. In addition the caller wouldn't receive an error for this which would make `fetchLater` unreliable.

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