[1] [CITE@en[draft-fielding-http-key-02 - The Key HTTP Response Header Field]]
( ([TIME[2013-09-29 17:30:37 +09:00]] 版))
<http://tools.ietf.org/html/draft-fielding-http-key-02>

[2] [CITE@en[The Key HTTP Response Header Field]]
([TIME[2016-04-06 02:26:28 +09:00]] 版)
<http://httpwg.org/http-extensions/key.html>