[1] draft-ietf-http-options-02 - Specification of HTTP/1.1 OPTIONS messages (10/17/2014, 1:55:52 PM 版) <https://tools.ietf.org/html/draft-ietf-http-options-02#section-3.4>
[2] RFC 4229 - HTTP Header Field Registrations ( (11/2/2014, 9:53:20 AM 版)) <http://tools.ietf.org/html/rfc4229#section-2.2.1>
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