gistfile1.rb

# --- BEFORE ---

module Rack
  class ETag
    def call(env)
      # ...
      unless headers['Cache-Control']
        if digest
          headers['Cache-Control'] = @cache_control if @cache_control
        else
          headers['Cache-Control'] = @no_cache_control if @no_cache_control
        end
      end
      # ...
    end

    # ...
    def skip_caching?(headers)
      (headers['Cache-Control'] && headers['Cache-Control'].include?('no-cache')) ||
        headers.key?('ETag') || headers.key?('Last-Modified')
    end
    # ...
  end
end


# --- AFTER ----
module Rack
  HEADER_CACHE_CONTROL = "Cache-Control".freeze

  class ETag
    def call(env)
      # ...
      unless headers[HEADER_CACHE_CONTROL]
        if digest
          headers[HEADER_CACHE_CONTROL] = @cache_control if @cache_control
        else
          headers[HEADER_CACHE_CONTROL] = @no_cache_control if @no_cache_control
        end
      end
      # ...
    end

    # ...
    def skip_caching?(headers)
      (headers[HEADER_CACHE_CONTROL] && headers[HEADER_CACHE_CONTROL].include?('no-cache')) ||
        headers.key?('ETag') || headers.key?('Last-Modified')
    end
    # ...
  end
end