Exporting HTTP APIs as OpenAPI 3.0 Now Supported by Amazon API Gateway
You can now export an OpenAPI 3.0 compliant API definition file from HTTP APIs in Amazon API Gateway. API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale. Previously, you had to import OpenAPI 3.0 API definitions to create HTTP APIs in API Gateway.
Source:: Amazon AWS