2014-03-28 YConnect http://mikanmarusan.hatenablog.com/entry/20130305/1362439681 https://github.com/intridea/omniauth-oauth2 https://github.com/yamitake/omniauth-yconnect http://oauth.jp/blog/2013/01/23/oauth-20-core-bearer-spec-rfc-rfc-6749-rfc-67/ https://rubygems.org/gems/omniauth-oauth2