Let's build an application!
It's going to be straightforward. We'll use just the most popular services, and we'll be done in no time: API Gateway, Lambda, ECS.

Let's go together through a journey and see what awaits:

1. The Contract
Can we make it easier for the team to establish the API contract? If only there was a simple and popular tool that could help us with that. Oh, there is! And it can be used to configure API Gateway as well?!
2. The Integration
We all know how to integrate Lambda with API Gateway: Proxy, right? There is nothing that could go wrong here..
3. The Lambda
Well, The Lambda, the Python, there is nothing to it, right? Package it, deploy it, and you're done. It just wo... Hey, why does it not start up?
4. The Mesh
We have a few services running in ECS, and we want to use AppMesh to manage the communication between them. Easy.
New requirement: clients need to use x-request-id header to send object id. No problem! ...No problem...?