https://tools.ietf.org/html/draft-ietf-httpbis-variants-06#section-2
Variants: Accept-Encoding=(gzip br), Accept-Language=(en fr)
result
Uppercase in Field name is not valid Dict key of SFV.
It should be lowered before encoding.
Variants: accept-encoding=(gzip br), accept-language=(en fr)
result
Feb 02
'21 13:02
Jxck