# File vendor/rails/actionpack/lib/action_controller/headers.rb, line 8
 8:       def initialize(*args)
 9:          if args.size == 1 && args[0].is_a?(Hash)
10:            super()
11:            update(args[0])
12:          else
13:            super
14:          end
15:        end

    # File vendor/rails/actionpack/lib/action_controller/headers.rb, line 17
17:       def [](header_name)
18:         if include?(header_name)
19:           super
20:         else
21:           super(env_name(header_name))
22:         end
23:       end