https://nginxstore.com/blog/nginx/openid-connect-%eb%b0%8f-nginx-plus%eb%a5%bc-%ec%82%ac%ec%9a%a9%ed%95%98%ec%97%ac-%ec%95%b1-%ec%9d%b8%ec%a6%9d%ed%95%98%ea%b8%b0/