Standard way to show custom (themed) error pages while using AmazonS3 service

I have a web-service wherein users upload files and these are accessible by only them.

I plan to keep files as private on AmazonS3 and serve signed URLs. But if there is some开发者_开发百科 error I want to show custom (themed) error pages.

Enabling a bucket as website does allow usage of a custom error page but then signed URLs are not supported.

What is standard way to show custom (themed) error pages while using AmazonS3?