Re: [fetch] CSP Request Header and CORS preflight fetch. (#52)

Related Client-Hint threads:
- https://github.com/httpwg/http-extensions/issues/141 (this one should probably live here, not on httpwg)
- https://github.com/igrigorik/http-client-hints/issues/68

FWIW, being able to observe CH headers within SW is an important use case. Similarly, requests initiated by fetch() and within SW should advertise appropriate UA-set CH headers. 

Does it make sense to allow UA-set headers to be treated as "simple headers", and trigger a preflight if set or modified by the developer?


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