Hard WebClient & WebFlux

HTTP Error Fallback Pattern

Simulate a WebClient call that fails. Create fetchFromPrimary() that returns Mono.error(RuntimeException("Service unavailable")). Create fetchFromFallback() that returns Mono.just("Fallback data"). Chain them with onErrorResume and print the result.

This pattern is critical for resilient microservices.

Expected

Fallback data

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Main.kt

HTTP Error Fallback Pattern

hard⏱ 15 minkotlinreactorchallengewebclient

This pattern is critical for resilient microservices.

Why this works

This pattern simulates a circuit-breaker-like fallback. When the primary service fails, onErrorResume() switches to a fallback Publisher. In production, this could be a cache, a secondary service, or a default response.

Expected output

Fallback data

HTTP Error Fallback Pattern

This pattern is critical for resilient microservices.

Expected

Fallback data

HTTP Error Fallback Pattern

hard⏱ 15 minkotlinreactorchallengewebclient

This pattern is critical for resilient microservices.

Why this works

Expected output

Fallback data