cakephp/cakephp — pull request #661 by suzuki (2012-05-21 10:33:44+00:00)
Title: Supported japanese legacy charset and changed to use upper case charset in Content-Type line

This is a new feature.

In Japan, sometime used ISO-2022-JP-MS charset.
This is a legacy and irregular charset, but this is sometimes used, yet.

When we use ISO-2022-JP-MS charset, the "Content-Type" use ISO-2022-JP, not ISO-2022-JP-MS.

And, a charset of "Content-Type" use upper case, because this is more natural.