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What steps do you take to debug authentication errors in REST API calls?

General/Othereasy0.3 min readPremium
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Virtusa
Expert AnswerPremium
56 wordsInterview-ready
**Systematic debug:** (1) Verify credentials—token expiry, rotation, scope. (2) Headers—Authorization format (Bearer vs Basic). (3) Logging—request IDs, status, error payloads. (4) Isolate—curl/Postman to separate client vs server. (5) CORS—preflight can masquerade as auth. **Production:** Structured logging, correlation IDs; retry with backoff for 401/403; circuit breaker for repeated failures....
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