[Solved] How can a REST API combine rate limit error responses with authentication errors effectively? — Ans: Return 401 Unauthorized before checking rate limits | Rest API

Rest API - Error Handling

How can a REST API combine rate limit error responses with authentication errors effectively?

AReturn 401 Unauthorized before checking rate limits

BReturn 429 status with Retry-After header only after successful authentication

CReturn 429 status without Retry-After header when authentication fails

DIgnore authentication and always return 429 when rate limit exceeded

Step-by-Step Solution

Solution:

Step 1: Understand order of checks in API
Authentication must be verified before rate limiting to avoid leaking info or wasting resources.
Step 2: Identify correct response order
Return 401 Unauthorized if authentication fails, only then apply rate limiting and return 429 if needed.
Final Answer:
Return 401 Unauthorized before checking rate limits -> Option A
Quick Check:
Authenticate first, then rate limit [OK]

Quick Trick: Authenticate before applying rate limits [OK]

Common Mistakes:

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How can a REST API combine rate limit error responses with authentication errors effectively?