http://devcenter.heroku.com/articles/http-routing#the_herokuappcom_http_stack http://devcenter.heroku.com/articles/http-routing#the_heroku... "The new HTTP sta

http://devcenter.heroku.com/articles/http-routing#the_herokuappcom_http_stack http://devcenter.heroku.com/articles/http-routing#the_heroku... "The new HTTP stack does not include Varnish (a reverse proxy cache) because it is not compatible with the advanced HTTP features described above. If you wish use HTTP caching headers, rack-cache and the memcache add-on offer features and performance comparable to Varnish, but with the additional benefit of giving you complete control over authentication and page expiration."