At my job we wanted to setup an API gateway.
We choose AWS API Gateway but we wanted to test it in front of AWS ECS.
To be sure to test only the gateway we choosed to create the simplest docker image, to deploy a simple API who only answer an hello world.
The sources are here : https://github.com/thomaspoignant/hello-world-rest-json
As you can see this is just a simple Spring-boot app who listen to 8080 and answer a simple json.
If you want to pull the image and test it through your API Gateway, feel free to do it, it’s available here : https://hub.docker.com/r/thomaspoignant/hello-world-rest-json
I hope it will be userfull for you, it was for me :)