Rack::MD5

gistfile1.rb

require 'digest/md5'                                                                                           

module Rack
  # Adds the Content-MD5 entity header which provides a MD5 digest of
  # the entity body for integrity check.
  class MD5

    def initialize app
      @app = app
    end

    def call env
      status, headers, body = @app.call env

      headers['Content-MD5'] = Digest::MD5.hexdigest(body.join(""))
      [status, headers, body]
    end
  end
end