当 Keycloak-Auth-Server 关闭 401 时返回 500？

Question

当我的 Keycloak-Auth-Server 关闭时（我知道它不应该关闭，但我无法控制这个实例）发送到我的 spring-api 的每个请求都会返回 401 Unauthorized。 相反，我想返回一个 500 - 内部服务器错误，以便在前端更好地处理错误。

我很确定这个问题可以在 SecurityConfig 中解决，但我还没有在文档中找到任何东西

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
@ComponentScan(basePackageClasses = KeycloakSecurityComponents.class)
public class SecurityConfig extends KeycloakWebSecurityConfigurerAdapter \{

    @Override protected void configure(HttpSecurity http) throws Exception {
        super.configure(http);

        http.cors()
            .and()
            .csrf().disable().sessionManagement()
            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
            .and().authorizeRequests()            
            .anyRequest().authenticated();
    }

    @Override protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {

        /**Returning NullAuthenticatedSessionStrategy means
         *app will not remember session
         */

        return new NullAuthenticatedSessionStrategy();
    }

    @Autowired public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        KeycloakAuthenticationProvider keycloakAuthenticationProvider = keycloakAuthenticationProvider();

        keycloakAuthenticationProvider.setGrantedAuthoritiesMapper(new SimpleAuthorityMapper());

        auth.authenticationProvider(keycloakAuthenticationProvider);
    }

    @Bean public FilterRegistrationBean<?> keycloakAuthenticationProcessingFilterRegistrationBean(
            KeycloakAuthenticationProcessingFilter filter) {

        FilterRegistrationBean<?> registrationBean = new FilterRegistrationBean<>(filter);

        registrationBean.setEnabled(false);
        return registrationBean;
    }

    @Bean public FilterRegistrationBean<?> keycloakPreAuthActionsFilterRegistrationBean(
            KeycloakPreAuthActionsFilter filter) {

        FilterRegistrationBean<?> registrationBean = new FilterRegistrationBean<>(filter);
        registrationBean.setEnabled(false);
        return registrationBean;
    }

    @Bean public FilterRegistrationBean<?> keycloakAuthenticatedActionsFilterBean(
            KeycloakAuthenticatedActionsFilter filter) {

        FilterRegistrationBean<?> registrationBean = new FilterRegistrationBean<>(filter);

        registrationBean.setEnabled(false);
        return registrationBean;
    }

    @Bean public FilterRegistrationBean<?> keycloakSecurityContextRequestFilterBean(
            KeycloakSecurityContextRequestFilter filter) {

        FilterRegistrationBean<?> registrationBean = new FilterRegistrationBean<>(filter);

        registrationBean.setEnabled(false);

        return registrationBean;
    }

    @Bean @Override @ConditionalOnMissingBean(HttpSessionManager.class) protected HttpSessionManager httpSessionManager() {
        return new HttpSessionManager();
    }
}