CloudFront (CF) is forwarding a request to a specific origin based on the URI pattern (ex. https://domain -> CloudFront -> /uri -> s3://bucket).

You can attach a CF Function to the distribution and rewrite the URI before it is forwarded to the origin.

These are examples:

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

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