The introduction of ActiveStorage in Rails 5.2 changed the way we upload or serve the attachments in a Rails application.

ActiveStorage has made it easier to integrate and use various cloud storage services.

While working with attachments, we often come across situations where we need to expire the URLs after a specific amount of time.

Before, this specific change, we had to use the service url (referred as service_url before) to set the expiration time.

But, with the introduction of this change in ActiveStorage, it can be set with the redirection URL itself without using or exposing the actual service URL.