This is a simple example for using Lambda and Application Load Balancer as a proxy for S3. This is especially useful when you need the S3 Bucket to: 1. Behave like a normal website, e.g. for a Single-Page Application 2. Have a traffic path that is entirely internal to your VPC or wider internal network
A simple mapping is configured in src/mappings.json to point a requested Host to a given bucket. See the file for an example. When the Application Load Balancer receives a request for a given Host, the Lambda will check the mapping file and attempt to request the supplied Path in the mapped S3 Bucket.
This example is deployed via CodePipeline using cfn/pipeline.yml. Feel free to use this, just point it at your own repo and use your own source control credentials in the Source Action. Otherwise, if you want to use something other than CodePipeline, you can use the provided example CloudFormation templates in the cfn directory.
