Lambda@Edge to redirect from non-canonical (example.net) to canonical (example.com)

RedirectCanonical.js

'use strict';

/**
 * Deploy this Lambda@Edge, in Origin Request event,
 * to a CloudFront distribution that hosts the
 * NON-Canonical domains. It will redirect everything
 * to the canonical version of the URL.
 * And let CloudFront and browsers cache the redirect.
 */
exports.handler = (event, context, callback) => {
  const request = event.Records[0].cf.request;
  const uri = request.uri;
  const queryString = request.querystring;
  
  const canonicalUrl = 'https://example.com' + uri + 
    (queryString ? '?' + queryString : '');
    
  const response = {
      status: '301',
      statusDescription: 'Moved Permanently',
      headers: {
          'location': [{
              key: 'Location',
              value: canonicalUrl,
          }],
          'cache-control': [{
              key: 'Cache-Control',
              value: 'max-age=86400,public',
          }],
      },
  };
  
  callback(null, response);
};