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

> We are planning to implement and ship the keepalive flag. At the intent-to-ship thread, some people want to restrict the number of requests at a time, as well as the total number of inflight bytes.

To clarify, we already spec 64KB limit for inflight bytes.

> sendBeacon() doesn't have a limitation on the number of requests in spec (nor in implementations as far as I know).

Indeed. Nor, afaik, has this ever come up as a problem based on current sendBeacon deployments. FWIW, while it's tempting to be really aggressive here, it's also important to recognize that if we bend this too far, developers will simply revert to their existing tricks — sync XHRs, spinning in while loops in click handlers, and so on.

@yutakahirano @davidben what's the motivation for limiting number of requests, in addition to existing restrictions?

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