CODEWITHSUNDEEP
ruby-on-railsrubyrails-activestorage
Molfar
Molfar

Reputation: 1501

How to set Cache-control for ActiveStorage Disk service?

I have a simple Rails 6 app with ActiveStorage. I use local disk storage. When I inspect responses from representation url like this

http://localhost:3000/rails/active_storage/disk/some-long-hash/IMG_0951.jpeg?content_type=image%2Fjpeg&disposition=inline%3B+filename%3D%22IMG_0951.jpeg%22%3B+filename%2A%3DUTF-8%27%27IMG_0951.jpeg

I see headers Cache-Control: max-age=0, private, must-revalidate

The question is how to make Rails to set public caching header with some age?

Upvotes: 10

Views: 1020

Answers (2)

stwienert
stwienert

Reputation: 3632

Builinding on @anothermh's answer, here a up-2-date version for Rails 7.1 - After Zeitwerk it is difficult to call controllers or models directly from an initializer.

# config/initializers/active_storage_cache_control.rb
  Rails.application.reloader.to_prepare do
    ActiveStorage::DiskController.class_eval do
      before_action only: [:show] do
        response.set_header('Cache-Control', 'max-age=86400, public')
      end
    end
  end

Upvotes: 1

anothermh
anothermh

Reputation: 10536

The #show method for ActiveStorage::DiskController is difficult to override but it can be done.

A simpler approach is to add an after_action callback for the existing #show method to insert the Cache-Control header when it is called:

# config/initializers/active_storage.rb

require 'active_storage/current'

ActiveStorage::Current.url_options = { host: 'localhost', port: 3000 }

require 'active_storage/set_current'
require 'active_storage/base_controller'
require 'active_storage/file_server'
require 'active_storage/disk_controller'

class ActiveStorage::DiskController < ActiveStorage::BaseController
  after_action do
    response.set_header('Cache-Control', 'max-age=3600, public') if action_name == 'show'
  end
end

Requesting an ActiveStorage URL then returns the custom Cache-Control header value in the response:

HTTP/1.1 200 OK
Cache-Control: max-age=3600, public
...

Upvotes: 1

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