UA-resolution:

UA-resolution:

[1] draft-mutz-http-attributes-00 - User-Agent Display Attributes ( 版) <https://tools.ietf.org/html/draft-mutz-http-attributes-00>

[2] RFC 4229 - HTTP Header Field Registrations ( 版) <http://tools.ietf.org/html/rfc4229#section-2.2.15>