Re: [whatwg/fetch] Why does Fetch specify a max redirect count of 20? (#576)

@wanderview Does Firefox have metrics on redirect counts, to assess what the impact would be?

We don't have general redirect counts, but Chrome 61 added one for top-level navigations ( `PageLoad.Navigation.RedirectChainLength` in https://cs.chromium.org/chromium/src/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc?rcl=413e72f9569c5b502335883143d9b96f6cd1474c&l=264 ), but that'll take a while before we get representative samples, and wouldn't count sub-resources.

I suspect given the HSTS+Extensions implications, we'd probably want to measure to see what our breakage rate would be. Even from those preliminary results (from Beta users), we do see that there's a non-zero (roughly .003% from the current dataset) of users with >16 redirects in the top-level navigation.

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