Skip to main content

asset_caching_strategies

⚡ Advanced Asset Caching with Far Future Expires and ETags​

Rails fingerprints assets by default, but you can also set cache headers and leverage ETags for faster repeat visits. Configure middleware in production.rb:

# config/environments/production.rb
Rails.application.configure do
  # Serve static assets with Far‑Future expires header
  config.public_file_server.headers = {
    'Cache-Control' => 'public, max-age=31536000',
    'Expires' => 1.year.from_now.to_formatted_s(:rfc822)
  }

  # Enable Rack::ETag to generate ETags automatically
  config.middleware.insert_after ActionDispatch::Static, Rack::ETag
end

Clients will cache fingerprinted files for a year and still validate with the ETag if needed, drastically reducing bandwidth.