A microservice fails to verify JWT tokens from upstream services. Which of these is the most likely cause?

medium📝 Analysis Q14 of 15

Microservices - Authentication and Authorization

AThe microservice does not forward the Authorization header

BThe microservice uses a different secret or public key to verify tokens

CThe microservice sends tokens in the request body instead of headers

DThe microservice caches tokens for too long

Step-by-Step Solution

Solution:

Step 1: Analyze verification failure causes
Verification fails if the microservice uses a wrong secret or public key to check the JWT signature.
Step 2: Evaluate other options
Not forwarding headers causes downstream issues, sending tokens in body is non-standard but not verification failure, caching affects freshness but not signature verification.
Final Answer:
The microservice uses a different secret or public key to verify tokens -> Option B
Quick Check:
Wrong key = verification fails [OK]

Quick Trick: Verification needs matching secret/public key [OK]

Common Mistakes:

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