Re: [slightlyoff/ServiceWorker] CORS pre-flight for foreign fetch (#880)

Yea, I think some kind of safety belt seems reasonable since I expect many writers of ForeignFetchEvent service workers won't understand all the different types of requests that could be thrown at it.  Having to explicitly opt in to handling POSTs would be good to prevent naive pass-through code accidentally sending posts to the server without CORS protections.

Thanks.

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