Difference between custom domain names of AWS API Gateway


AWS API gateway currently supports two types custom domain names: Edge Optimized and Regional.

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Let me share what the differences that I have found out so far:

  • Target Domain Name
    Edge optimized: target domain name is called distributionDomainName, and it is the format of <distribution-id>.cloudfront.net
    Regional: target domain name is called regionalDomainName, and it is the format of <api-id>.execute-api.<region>.amazonaws.com
  • ACM Certificate
    Edge optimized: only can use the certificate that is issued in us-east-1
    Regional: use regional issued certificate
  • Route 53 Alias
    Edge optimized: supports route 53 A type Alias. Typical usage is top level domain (apex) A record. (Note: this type does not support Route53 active-active or active-passive due to DNS healthcheck is not compatible with cloudfront)
    Regional: does not support route 53 alias by default unless you manually create a cloudfront distribution for it.

Reference:  http://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-custom-domains.html

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