key-value store for Rack

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 module Metropolis::SuffixMime
  MIME_TYPES = Rack::Mime::MIME_TYPES
  include Metropolis::Constants

  def get(key, env)
    set_mime(key, super)
  end

  def head(key, env)
    set_mime(key, super)
  end

  def set_mime(key, response)
    status, headers, _ = response
    200 == status && /(\.[^\.]+)\z/ =~ key and
      type = MIME_TYPES[$1] and headers[Content_Type] = type
    response
  end
end