登出

Spring Security 預設提供一個登出端點。登入後，你可以 GET /logout 檢視預設的登出確認頁面，或者 POST /logout 來發起登出。這將

清除 ServerCsrfTokenRepository、ServerSecurityContextRepository，並且
重定向回登入頁面

通常，你還會希望在登出時使會話失效。為此，你可以將 WebSessionServerLogoutHandler 新增到你的登出配置中，如下所示

Java
Kotlin

@Bean
SecurityWebFilterChain http(ServerHttpSecurity http) throws Exception {
    DelegatingServerLogoutHandler logoutHandler = new DelegatingServerLogoutHandler(
            new SecurityContextServerLogoutHandler(), new WebSessionServerLogoutHandler()
    );

    http
        .authorizeExchange((authorize) -> authorize.anyExchange().authenticated())
        .logout((logout) -> logout.logoutHandler(logoutHandler));

    return http.build();
}

@Bean
fun http(http: ServerHttpSecurity): SecurityWebFilterChain {
    val customLogoutHandler = DelegatingServerLogoutHandler(
        SecurityContextServerLogoutHandler(), WebSessionServerLogoutHandler()
    )

    return http {
        authorizeExchange {
            authorize(anyExchange, authenticated)
        }
        logout {
            logoutHandler = customLogoutHandler
        }
    }
}