Diff of CSRF

• The added line is THIS COLOR.
• The deleted line is THIS COLOR.
• Go to CSRF.

- 「ぼくはまちちゃん」 ――知られざるCSRF攻撃
--  http://www.atmarkit.co.jp/fsecurity/column/ueno/33.html
- 開発者のための正しいCSRF対策
--   http://www.jumperz.net/texts/csrf.htm

- CSRF is (really) dead
--  https://scotthelme.co.uk/csrf-is-really-dead/