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

`Lowercasing makes sense to me.
I am not sure how we can best handle the transition though.`

you need to do a case insensitive comparison - header names have always been defined case insensitively (in both versions of HTTP) - so doing a case sensitive comparison is an application bug that should be fixed. That will give you consistent behavior.


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