Rails 4 images not loading on heroku

I needed to combine several solutions to make this work, here is what I did:

Gemfile

gem 'rails_12factor', group: :production

in my Heroku console

heroku labs:enable user-env-compile -a yourapp

production.rb

config.serve_static_assets = true
config.action_dispatch.x_sendfile_header="X-Accel-Redirect"
config.assets.compile = true

I didn’t need to precompile the assets locally.

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