tomayko.com Rack::Cache configuration

gistfile1.rbx

# from tomayko.com.ru (rackup file)
# tomayko.com Rack::Cache configuration

use Rack::Cache do
  # add never-expire headers to responses that have a cache breaking slug
  import 'rack/cache/config/busters'

  set :metastore,   "file:cache/meta"
  set :entitystore, "file:cache/body"

  on :receive do
    if request.header?('Authorization')
      request.env.delete('HTTP_IF_MODIFIED_SINCE')
      request.env.delete('HTTP_IF_NONE_MATCH')
      pass!
    end
  end

  on :fetch do
    next if response.freshness_information?
    case request.url
    when /\/feed$/
      trace 'feed will expire in fifteen minutes'
      response.ttl = 15 * 60
    when /\/topics\/.*/, /\/circa\/.*/
      trace 'topic/circa index page will expire in five minutes'
      response.ttl = 5 * 60
    end
  end
end