Delivering assets through CloudFlare requires monkey-patch

[sedubois]

Steps to reproduce

It appears that delivering ActiveStorage assets through CloudFlare (free plan) can be done as suggested here + here:

• add Rails.application.config.active_storage.resolve_model_to_route = :rails_storage_proxy to config/initializers/active_storage.rb OR use rails_storage_proxy_path in the views (e.g. rails_storage_proxy_path(content.poster.variant(resize_to_limit: [size, size]))). There is it seems no need to define a direct :cdn_image like in the docs, as the CDN host remains the same when using CloudFlare.
• monkey-patch request.session_options[:skip] = true in the ProxyControllers (ref)

Expected behavior

• No monkey-patch should be needed.
• It would be helpful to have some documentation to use CloudFlare with ActiveStorage.

Actual behavior

After doing the above, I can see my images have headers cache-control: public, max-age=3155695200 and cf-cache-status: HIT (after the second request). However, a monkey-patch was necessary to achieve this, so @zzak recommended I open this issue.

System configuration

Rails version: 7.0.0

Ruby version: 3.0.3

[rafaelfranca]

This is mostly a feature request, so I think you either should implement it or start a thread on Rails Core discussion board to see if anyone is interested in implement it.

[lypanov]

How rude.

[brenogazzola]

An alternative to monkey patching is to use one of the limited page rules that comes with free plans to force cloudflare to cache:

URL: https://example.com/rails/active_storage/representations/proxy*
Browser Cache TTL: a year
Cache Level: Cache everything
Edge Cache TTL: a month