Skuunk Works

So the other day, I needed to cache an action which was basically a proxy action to return JSON. Basically, 3rd party company X has an XML API for it's deals. Ideally we would use JavaScript to pull the feed, but unfortunately, the feed is using XML which means we need to use the server to pull this "deal" and then reformat it in JSON for our site to use. To render the JSON we were using a render call render offer.to_json It can get expensive to pull this deal over the wire every time, so we looked into using caches action and set it to expire in 5 minutes (because that is how often the deal feed updates). caches_action :index, :expires_in => 5.minutes (Oh, also we need to turn caching on in dev to see this happening) config.action_controller.perform_caching = true While this worked fine for the first call, I noticed that in the subsequent calls, the application type was being set to 'text/html' instead of 'application/json'. This was causing the ...