Yet another info with spring web logs :
2024-04-23 16:46:27,232 DEBUG [org.springframework.security.web.FilterChainProxy] - <Securing POST /error>
2024-04-23 16:46:27,232 DEBUG [org.springframework.security.web.access.channel.ChannelProcessingFilter] - <Request: filter invocation [POST /error]; ConfigAttributes: [REQUIRES_SECURE_CHANNEL]>
2024-04-23 16:46:27,233 DEBUG [org.springframework.security.web.FilterChainProxy] - <Secured POST /error>
2024-04-23 16:46:27,234 DEBUG [org.springframework.web.servlet.DispatcherServlet] - <"FORWARD" dispatch for POST "/cas/error", parameters={masked}>
2024-04-23 16:46:27,234 DEBUG [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping] - <Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)>
2024-04-23 16:46:27,244 DEBUG [org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor] - <Using 'application/vnd.cas.services+yaml', given [*/*] and supported [application/vnd.cas.services+yaml, application/json, application/*+json, application/cbor, application/xml;charset=UTF-8, text/xml;charset=UTF-8, application/*+xml;charset=UTF-8]>
2024-04-23 16:46:27,244 DEBUG [org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor] - <Writing [{timestamp=Tue Apr 23 16:46:27 CEST 2024, status=403, error=Forbidden, message=Forbidden, path=/cas/ (truncated)...]>
2024-04-23 16:46:27,273 DEBUG [org.springframework.web.servlet.DispatcherServlet] - <Exiting from "FORWARD" dispatch, status 403>
2024-04-23 16:46:27,273 DEBUG [org.springframework.security.web.authentication.AnonymousAuthenticationFilter] - <Set SecurityContextHolder to anonymous SecurityContext>