Safety Nets: CloudFormation Custom Resources for Regional API Gateways

Up until this week we’ve been utilizing edge optimized custom domains within our API Gateways. This has been really easy to set up using CloudFormation and has been a great way for us to tightly control the URLs used to access our REST platform.

In order to support a more global expansion of the platform on AWS, we’re ditching the Edge optimized custom domains and getting into the Regional custom domains which were launched by AWS at reInvent 2017.

This caused me one major headache – the AWS::ApiGateway:DomainName resource in CloudFormation currently has no way to look up what the underlying URL is for me to add the appropriate Route53 record.

Before I get into the sample code and solution, let’s do a quick introduction into the difference between edge, and regional API Gateway endpoints.

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