https://datatracker.ietf.org/doc/draft-reschke-rfc5987bis/
draft-reschke-rfc5987bis-07 - Indicating Character Encoding and Language for HTTP Header Field...
By default, message header field parameters in Hypertext Transfer Protocol (HTTP) messages cannot carry characters outside the ISO- 8859-1 character set. RFC...
https://mailarchive.ietf.org/arch/msg/httpbisa/YnQY4jvL7bvc6CJKwms6vIFMstQ/
Call for Adoption: draft-reschke-rfc5987bis, was: Call for Adoption: draft-reschke-rfc54987bis
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