Rack::Nocache
It deletes your ETags, it ignores your If-* headers, to tramples all over your caching headers with:
{
"Cache-Control" => "no-cache, no-store, max-age=0, must-revalidate",
"Pragma" => "no-cache",
"Expires" => "Fri, 29 Aug 1997 02:14:00 EST"
}
It's an abusive, grumpy, bandwidth wasting, low down dirty dog of a middleware.
But I'm sure you'll find some use for it in development mode.
$ gem install rack-nocache
require "rack-nocache" # or "rack/nocache", whatever floats your boat.
use Rack::Nocache