cloudfront function for static sites

cloudfront-function.js

function handler(event) {
  var request = event.request
  var uri = request.uri

  // Check whether the URI is missing a file name.
  if (uri.endsWith('/')) {
    return {
      statusCode: 301,
      statusDescription: 'Moved Permanently',
      headers: {
        location: { value: request.uri.replace(/\/$/, '') },
      },
    }
  }
  // Check whether the URI is missing a file extension.
  else if (!uri.includes('.')) {
    request.uri += '.html'
  }

  return request
}