The media type of a content-type value: everything before the first ;,
trimmed and ASCII-lowercased. RFC 7303 ยง9.1 registers parameters such as
charset as optional additions to a media type, so two values that differ
only in parameters share one media type (#540).
The media type of a content-type value: everything before the first
;, trimmed and ASCII-lowercased. RFC 7303 ยง9.1 registers parameters such ascharsetas optional additions to a media type, so two values that differ only in parameters share one media type (#540).