Widerstandsfähige Fallbacks für reaktive HTTP-Aufrufe mit WebClient und onErrorResume

public Mono<UserProfile> fetchUserProfileWithFallback(String userId) {
    return webClient.get()
        .uri("/api/users/{id}", userId)
        .retrieve()
        .bodyToMono(UserProfile.class)
        .timeout(Duration.ofMillis(1500))
        .onErrorResume(WebClientResponseException.NotFound.class, ex -> {
            log.warn("Remote profile not found for user: {}", userId);
            return Mono.just(UserProfile.anonymousDefault());
        })
        .onErrorResume(TimeoutException.class, ex -> {
            log.error("User service timed out, returning cached profile", ex);
            return cacheService.getCachedProfile(userId);
        });
}