[keycloak-dev] Info endpoint to simplify debugging proxy config

I've been looking at some issues with reverse proxy when Keycloak is installed on EAP 7.0.3+ [1]. While doing so I found out that it's fairly inconvenient and not straightforward to debug if the proxy configuration is correct. To verify URLs you have to for example open the well-known endpoint for OIDC. Then you have to verify the remote IP address by doing a failed login attempt and looking at the server log. To make this simpler I propose adding the start of a server info endpoint. It will be a SPI that allows plugging in server info providers that can show different details if authenticated or not. You can either view info for all providers at a time with "/realms/master/.info" or for a specific provider "/realms/master/.info/proxy". The proxy info provider will display: { "authServerUrl" : "http://host1/auth", "remoteAddress" : "127.0.0.1", "proxyDetected" : true, "headers" : { "Host" : "host1", "X-Forwarded-For" : "1.2.3.4", "X-Forwarded-Host" : "host2", "X-Forwarded-Proto" : "https" } } Implementation is ready [2] I just need to get feedback and add tests. In the future we can expand on this to for instance provide a health monitoring endpoint that allows checking the server health (JPA connections, Infinispan connections, IdP connections, user fed connections, etc.). [1] https://issues.jboss.org/browse/KEYCLOAK-4149 [2] https://github.com/stianst/keycloak/commit/99abbc47c49585d1e62c74f3ea227e...