Common Errors

Works in Lambda, but not in API Gateway

Testing in API Gateway:

Status: 502

Response Body:

{
  "message": "Internal server error"
}

Logs:

Lambda execution failed with status 200 due to customer function error: RequestId: 80572150-944e-40e5-b782-aca7f713289f Process exited before completing request. Lambda request id: 80572150-944e-40e5-b782-aca7f713289f

Solution

Check your lambda function is either:

• Make sure you define your handler function async ; or

• Use the callback argument in your handler

For example:

export async function webhook(event, context) {
  return {
    statusCode: 200,
  };
}

or

export function webhook(event, context, callback) {
  callback(null, { statusCode: 200 });
}

Using Custom Domains with Cloudflare

1. Open AWS ACM Console (us-east-1)

   1. Click "Request a Certificate"

   2. Enter the domains you want to enable

2. Open AWS API Gateway​

   1. Select "Custom Domain Names" from the left menu.

   2. Click the "Create Custom Domain Name" button.

   3. Enter the "Domain Name"

   4. Select the ACM Certificate (us-east-1)

   5. Click "Base Path Mappings"

      1. Set the relevant path and destination

   6. Hit "Save"

   7. Wait a maximum of 40 minutes

3. Open Cloudflare​

   1. Select your domain and open the "DNS" tab

   2. Add a CNAME record

      1. For "Name":

         1. Use "@" if you are targeting the root domain. For example "build.my"

         2. Use "www" if you are targetting a subdomain. For example: "www.build.my"

      2. For "Domain name":

         1. Use the AWS APIGateway Target Domain Name. For example: "d1jdvkqtea2e81.cloudfront.net"

      3. For Status:

         1. Set to: DNS Only

Test only on https . Testing on http will redirect to https so it looks like nothing is happening.

curl --verbose https://dt.cards/

Pieced from:

• ​https://stackoverflow.com/questions/36737313/how-to-cname-to-amazon-api-gateway-endpoint​

• ​http://www.leanx.eu/tutorials/set-up-amazons-api-gateway-custom-domain-with-cloudflare​

• ​https://medium.com/@bobthomas295/combining-aws-serverless-with-cloudflare-sub-domains-338a1b7b2bd​

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