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URL：https://images.ctfassets.net/23aumh6u8s0i/1X32BMCDrSXJDavN5PTHiM/d2b8244ffbd6e3c6627246dda268836f/Ruby_red_hero.png 掲載元：https://auth0.com/blog/five-ruby-gems-for-authentication-and-authorization/
