Hello,

I encountered a server that returns content-disposition: attachment; filename="file.png"; filename*=utf8''file.png which is, according to RFC 5987, malformed because the charset should be utf-8, rather than utf8. When trying to decode content-disposition, it will fail at

. It is not my server and I have no way to ask them to change, so if you can fix this (either by accept utf8 or fallback to filename) that would be appreciated.