Re: [whatwg/fetch] CH processing, cross-origin redirects and service workers (#800)

Not extending the safelist for UA generated values would add a significant cost to introducing any new request headers. That makes little sense. (For both CH as well as other UA generated headers. e.g. `upgrade-insecure-requests`).

Preflights don't come for free, and we should carefully consider the (infinitesimal IMO) risk of sending newly-introduced UA generated headers (with value restrictions) to servers vs. the certainty of inflicting performance pain on all/many users as a result.

/cc @mikewest



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Received on Friday, 24 August 2018 08:33:42 UTC