https://docs.spring.io/spring-security/reference/servlet/oauth2/login/core.html
If the OAuth Client runs behind a proxy server, you should check the Proxy Server Configuration to ensure the application is correctly configured. Also, see the supported URI template variables for redirect-uri.
프록시 서버 사용시 redirect-uri 정보 잘 설정해야함
기록하고, 공유합시다