[1] draft-mutz-http-attributes-00 - User-Agent Display Attributes (10/12/2014, 8:03:29 AM 版) <https://tools.ietf.org/html/draft-mutz-http-attributes-00>
[2] RFC 4229 - HTTP Header Field Registrations (11/2/2014, 9:53:20 AM 版) <http://tools.ietf.org/html/rfc4229#section-2.2.15>
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