(But turns out pauldino's comment points out it is in the "content coding registry" at https://www.iana.org/assignments/http-parameters/http-parameters.xhtml ht

(But turns out pauldino's comment points out it is in the "content coding registry" at https://www.iana.org/assignments/http-parameters/http-parameters.xhtml https://www.iana.org/assignments/http-parameters/http-parame...)