---
title: "Rails の Cache-Control"
description: "Heroku で静的アセットの cache-control ヘッダーを設定し、CDN を使えるようにするには："
canonical: https://oozou.com/til/rails-cache-control-77
locale: ja
date: 2020-10-27
topic: ruby-on-rails
---

# Rails の Cache-Control

> Heroku で静的アセットの cache-control ヘッダーを設定し、CDN を使えるようにするには：

Published: 2020-10-27 · Topic: [ruby on rails](https://oozou.com/ja/til-topics/ruby-on-rails) ([markdown](https://oozou.com/ja/til-topics/ruby-on-rails.md))

Heroku で静的アセットの cache-control ヘッダーを設定し、CDN を使えるようにするには：

```rails
config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
config.public_file_server.headers = {
  'Cache-Control' => 'public, max-age=31536000',
  # You need to enable this (or set it to your domain) for fonts to work
  'Access-Control-Allow-Origin' => '*'
}

if ENV['ASSET_HOST'].present?
  config.action_controller.asset_host = ENV['ASSET_HOST'] # 'https://cdn.example.com'
end
```

---

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