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

@mingyc 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 have a issue (https://github.com/WICG/pending-beacon/issues/76) tracking this topic, and I don't remember about the decision to hand flushing off to userland implementation.

Also, I thought the quota of `keepalive` is specified by [spec](https://www.w3.org/TR/beacon/#sec-processing-model), and implemented by UA (not userland JS code)?

```
All requests with this flag set share the same in-flight quota restrictions that is enforced within the Fetch API.
```

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