This blog shows how to create a private REST API, and then will consume by the EC2 Linux Instance. It will use the AWS API Gateway to build a private REST API and use the existing VPC endpoint to communicate from EC2 to REST API. The traffic from EC2 to REST API will not go through the public internet. 

This blog shows how to build a simple API Gateway REST API with AWS Lambda. We'll also use AWS Lambda versioning and aliases to switch to a different version by using Node.js.