Re: [xhr] Should XHR store and send HTTP header names in lower case? (#34)

I think ideally everything is lowercased. Because the exact case will be observable with service workers through the `Headers` API, at least for headers that are set before the network layer. If we cannot make that work with legacy content however we'll need something more complicated. That would be sad.

@wanderview might be interested in this. Maybe @mnot and @jungkees too.

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