example usage: with static web sites stored in S3, then URL ends with "/" to appends "index.html"
An Introduction To AWS CloudFront Functions - Honeybadger Developer Blog
"CloudFront Functions are an incarnation of FaaS (Function as a Service) and allow you to deploy JavaScript functions to AWS' network of edge locations, to be executed as close as possible to end users.
This new feature allows you to customize or personalize content for your application users closer to where they’re located, thus minimizing network latency. For example, you can transform HTTP headers or API responses to personalize your application for each visitor, implement authentication or encryption logic (such as JWT authentication) to allow or deny requests, or set up URL rewrites and redirects right on the edge."
function handler(event) {
var request = event.request;
var uri = request.uri;
// Check whether the URI is missing a file name.
if (uri.endsWith('/')) {
request.uri += 'index.html';
}
// Check whether the URI is missing a file extension.
else if (!uri.includes('.')) {
request.uri += '/index.html';
}
return request;
}
