AWS Lambda和API Gateway Endpoint响应中的调试错误

Question

I have a lambda function that is wired up to work with API Gateway. When I run it locally it works, when I simulate it with serverless offline it works.

But against the published dev endpoint, it returns an error 500 and a json object with an error message:

{
  "message": "Internal server error"
}

In the CloudWatch logs, there are no errors. In the callstack in the API gateway endpoint testing page, I see my correct response body in the Lambda portion of the process, and then when it gets to the API gateway response step, something goes wrong.

How should I debug API Gateway when there aren't any errors in logs?

Answer 1

If you're writing it in node, it could be that your node version is different than 4.3.2 ( the one that AWS Lambda uses ) and that's why testing offline and locally works but not in the AWS Lambda.

This happened to me before, when I was using let .

You could use nvm to install node v 4.3.2 to test it locally or you could look here to see what features are you allowed to use in your code.

Answer 2

To get API Gateway feeding cloudWatch :

1. create a new role with AmazonAPIGatewayPushToCloudWatchLogs in IAM
2. copy the role ARN arn:aws:iam::<account id>:role/<role name>
3. paste it in field : API Gateway > Settings > CloudWatch log role ARN
4. Go to APIs > <API name> > Stages > Settings > CloudWatch Settings and :
   • check Enable CloudWatch Logs
   • choose Log Level (INFO to see everything)
   • check Log full requests/responses data (dump the entire initial request and response into the log)
   • check Enable CloudWatch Metrics (to see Graph in CloudWatch)

Now your logs can be viewed in :

• CloudWatch > Logs

under a name like API-Gateway-Execution-Logs_<api id>/<api stage>