Re: [whatwg/fetch] keepalive: Do we need to restrict the number of requests at a time? (#662)

Per-document/worker limit is avoidable as @davidben says. per-origin limit is avoidable by creating many third-party iframes (www1.example.com/, www2.example.com/, ...).  per-tab limit may be close to user's expectation but it's not working well with SharedWorker / ServiceWorker. I can think of two policies sounding somewhat sane to me.

 1. Solely rely on timeout. When a user closes a tab, all network resources for the tab will be released after N seconds. There's no limit for the number of inflight keepalive requests.
 2. Have a per-tab limit (i.e., M keepalive requests per tab including iframes / dedicated workers). keepalive requests are not supported in ServiceWorker and SharedWorker.

What do you think?


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