Re: [ServiceWorker] Support modifying cookies on an intercepted fetch (#837)

@jakearchibald the issue is that for some legacy backends (spoiler: there are lots of these out there) it's near impossible to modify all possible endpoints on the server to check and re-issue a new cookie. A much more practical engineering approach is to check in one place in the SW and then hit a single endpoint to refresh the cookies before letting the original fetch proceed.

I know of some specific companies affected by this but don't want to name names. But some identity folk at Google think that if this approach could be made to work then it would be practical for a number of very large sites to keep users logged much longer. 

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https://github.com/slightlyoff/ServiceWorker/issues/837#issuecomment-189465961