disposition := "Content-Disposition" ":"
               disposition-type
               *(";" disposition-parm)

disposition-type := "inline"
                  / "attachment"
                  / extension-token
                  ; values are not case-sensitive

disposition-parm := filename-parm / parameter

filename-parm := "filename" "=" value;

extension-token := <defined in [RFC822] or [RFC1521]>

parameter := <defined in [RFC822] or [RFC1521]>

value := <defined in [RFC822] or [RFC1521]>