FriendsOfSymfony/oauth2-php — pull request #24 by GromNaN (2013-04-16 15:16:28+00:00)
Title: Remove charset from the response content-type

This is not required as JSON use UTF-8 by default.
http://stackoverflow.com/a/14955491/450789

This is consistent with `OAuth2ServerException`.
https://github.com/FriendsOfSymfony/oauth2-php/blob/master/lib/OAuth2/OAuth2ServerException.php#L76