Suggestion: use CloudFlare to cache images at the HTTP layer so multiple requests for the same URL never even hit your app servers.
CloudFlare + PaaS providers like Nodejitsu/Heroku is a great combination, IMHO.
CloudFlare + PaaS providers like Nodejitsu/Heroku is a great combination, IMHO.
http://phoboslab.org/log/2013/02/how-much-traffic-is-too-muc...
Essentially the site was just one html page that had endless scrolling and loaded hundreds of images. CloudFlare declared the site as being under a "Layer 7 Attack" even though it wasn't.