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You set up API Gateway with Lambda integration but get a 403 Forbidden error when calling the API. What is the most likely cause?

medium📝 Debug Q14 of 15
AWS - API Gateway
You set up API Gateway with Lambda integration but get a 403 Forbidden error when calling the API. What is the most likely cause?
AAPI Gateway lacks permission to invoke the Lambda function
BThe API Gateway endpoint URL is incorrect
CThe Lambda function code has syntax errors
DThe Lambda function timeout is too short
Step-by-Step Solution
Solution:

  1. Step 1: Understand 403 Forbidden meaning

    403 means access denied, often due to missing permissions.

  2. Step 2: Check Lambda invoke permissions

    API Gateway must have permission to invoke Lambda; missing this causes 403 errors.

  3. Final Answer:

    API Gateway lacks permission to invoke the Lambda function -> Option A

  4. Quick Check:

    403 Forbidden = missing invoke permission [OK]
Quick Trick: 403 Forbidden means missing invoke permission [OK]
Common Mistakes:
MISTAKES
  • Blaming Lambda code errors for 403
  • Assuming wrong URL causes 403
  • Thinking timeout causes 403 instead of 504

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