Customizing the URL Format for Files in CloudFront

https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/LinkFormat.html

After you set up your origin with the objects (content) that you want CloudFront to serve to your viewers, you must use the correct URLs to reference those objects in your website or application code so that CloudFront can serve it.

The domain name that you use in the URLs for objects on your web pages or in your web application can be either of the following:

• The domain name that CloudFront automatically assigns when you create a distribution
• Your own (alternate) domain name. You must own the domain name, or have authorization to use it, which you verify by adding an SSL/TLS certificate.

  If you add a CNAME (alias) to your distribution, you must also do the following:

  • Create (or update) a CNAME record with your DNS service to route queries for the CNAME to the CloudFront domain name;
  • Add a certificate to CloudFront from a trusted certificate authority (CA) that covers the domain name (CNAME) that you add to your distribution, to validate your authorization to use the domain name.

When you specify URLs for directories in your CloudFront distribution, choose either to always use a trailing slash or to never use a trailing slash. Both formats work to link to CloudFront objects, but being consistent can help prevent issues when you want to invalidate a directory later. CloudFront stores URLs exactly as they are defined, including trailing slashes. So if your format is inconsistent, you’ll need to invalidate directory URLs with and without the slash, to ensure that CloudFront removes the directory.