Take a signed permanent reference for a blob and turn it into an expiring service URL for download. Note: These URLs are publicly accessible. If you need to enforce access protection beyond the security-through-obscurity factor of the signed blob references, you'll need to implement your own authenticated redirection controller.

Methods
S
Instance Public methods
show()

Source: show | on GitHub 

# File activestorage/app/controllers/active_storage/blobs_controller.rb, line 10
def show
  expires_in ActiveStorage.service_urls_expire_in
  redirect_to @blob.service_url(disposition: params[:disposition])
end