You configured an API Gateway method but clients receive 403 Forbidden errors. What is the most likely cause?

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AWS - API Gateway

AThe client is sending requests with wrong HTTP method.

BThe API Gateway resource policy denies access to clients.

CThe backend database is down.

DThe Lambda function code has syntax errors.

Step-by-Step Solution

Solution:

Step 1: Analyze 403 Forbidden meaning
403 means access is denied, often due to permissions or resource policies.
Step 2: Match cause to API Gateway
API Gateway resource policies can restrict client access, causing 403 errors. Lambda errors or backend issues usually cause 500 errors, and wrong HTTP methods cause 405 errors.
Final Answer:
The API Gateway resource policy denies access to clients. -> Option B
Quick Check:
403 Forbidden = Access denied by policy [OK]

Quick Trick: 403 means permission denied, check API Gateway policies [OK]

Common Mistakes:

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