Lambda not getting triggered for API call

Question

On hitting APIs, authorizer lambda is triggered and responds with Success/Allow but main lambda is not triggered to complete the API call.
Response of Authorizer:{
  Version: '2012-10-17',
  Statement: [
    {
      Action: 'execute-api:Invoke',
      Effect: 'Allow',
      Resource: '<>/api/POST/audit/postaudit'
    }
  ]
}

The same code is deployed through Gitlab CI in different branches, some branche APIs are working fine while other branches having above error.

Answer

Hi

Lets try debugging:

* Ensure the main Lambda is still integrated with the API method in API Gateway. Test it directly using a sample event.  [Link refrence](https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-test-method.html)
* Enable the Logging on the API GW to see what happening about the triggering. [Enable Logging on API GW](https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-logging.html)
* Check your GitLab CI pipeline for deployment discrepancies. Check GitLab CI for deployment differences.
* Review authorizer policy and CORS settings.

Answer

Make sure that the Lambda function's resource policy allows API Gateway to invoke it.

Lambda not getting triggered for API call

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