You have configured a POST method in API Gateway with Lambda integration, but when invoking the method, you receive a 403 Forbidden error. What is the most probable cause?

medium📝 Debug Q6 of 15

AWS - API Gateway

AThe client request payload is malformed JSON

BThe Lambda function code contains syntax errors

CThe API Gateway execution role lacks permission to invoke the Lambda function

DThe API Gateway endpoint URL is incorrect

Step-by-Step Solution

Solution:

Step 1: Identify 403 Forbidden Meaning
A 403 error indicates permission issues, not code or payload errors.
Step 2: Check API Gateway Permissions
API Gateway needs permission to invoke the Lambda function via its execution role.
Final Answer:
The API Gateway execution role lacks permission to invoke the Lambda function -> Option C
Quick Check:
403 errors usually mean permission denied [OK]

Quick Trick: 403 Forbidden usually means missing invoke permissions [OK]

Common Mistakes:

Assuming 403 is caused by Lambda code errors
Blaming client payload format for 403
Ignoring IAM role permissions for API Gateway

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You have configured a POST method in API Gateway with Lambda integration, but when invoking the method, you receive a 403 Forbidden error. What is the most probable cause?

Step 1: Identify 403 Forbidden Meaning

Step 2: Check API Gateway Permissions

Final Answer:

Quick Check:

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