- https://docs.spring.io/spring-security/site/docs/current/reference/html/oauth2.html
- https://docs.spring.io/spring-security/site/docs/current/reference/html5/
- https://developer.okta.com/blog/2019/05/15/spring-boot-login-options
- https://developer.okta.com/docs/guides/implement-oauth-for-okta/request-access-token/
- https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps/