[REFS[
- [1] ''Nonstandard HTTP Headers'' <http://web.archive.org/web/20020610043404/http://www.dais.is.tohoku.ac.jp/~kabe/WWW/nonstdhdr.html#X-Forwarded-For>
- [2]
[CITE@en[Content Transformation Guidelines 1.0]] ([TIME[2008-08-01 01:46:12 +09:00]] 版) <http://www.w3.org/TR/2008/WD-ct-guidelines-20080801/#sec-additional-headers>
- [3] [CITE@en[Guidelines for Web Content Transformation Proxies 1.0]]
( ([TIME[2010-10-22 17:20:31 +09:00]] 版))
<http://www.w3.org/TR/2010/NOTE-ct-guidelines-20101026/#sec-additional-headers>
]REFS]