> So looking at https://tools.ietf.org/html/rfc7231#section-9.7 has me wondering, are we sending an empty accept language header or no accept language header? > Would these sites work if there was no accept language at all? We are sending no accept language header at all. That's the core problem. These sites expect there to be an accept language header, regardless of the value. I'm going to do some more testing to see if sending an empty language accept header works.
Bug 1415146 Comment 22 Edit History
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> So looking at https://tools.ietf.org/html/rfc7231#section-9.7 has me wondering, are we sending an empty accept language header or no accept language header? > Would these sites work if there was no accept language at all? We are sending no accept language header at all. That's the core problem. These sites expect there to be an accept language header, regardless of the value. I'm going to do some more testing to see if sending an empty language accept header works. (Independent of the navigator.language problem. I think there are two issues here, navigator.language and accept header)