Re: [whatwg/xhr] Web compat implications of making getAllResponseHeaders lowercase (#146)

@natechadwick - you seem to miss the point that even before HTTP/2.0, proxy servers and other middlewares were totally allowed (and even did in some cases) to change the case of the headers.
So while your application might have never encountered a (complaining) user behind such a middleware, it does not mean that it never would have encountered one.

I agree that this is a breaking change and that breaking changes (should and do) have a pretty low bar for being reverted, but it is also your responsibility (or the responsibility of the maintaining company) to test your software as long as it is maintained with every version of any browser (preferably - early channel versions, in order to catch the issues earlier and either fix them or report them).
We are no longer living in a world where you can count on your users to use Internet Explorer 6 for a decade, fortunately and unfortunately. ;)

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