Re: [whatwg/fetch] consider adding note that CORS preflight check excludes headers added by the browser or extensions (#1005)

> I am unsure what webkit does here.

WebKit does CORS checks out-of-process and sends the list of headers set by the web application. Service workers do face a similar issue, since they are usually out of process.

The webRequest API allows modifying requests on the fly. It would be nice if it was easy for them to specify whether CORS/service worker should take these headers into account.

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