# File lib/action_controller/headers.rb, line 5
 5:       def initialize(constructor = {})
 6:          if constructor.is_a?(Hash)
 7:            super()
 8:            update(constructor)
 9:          else
10:            super(constructor)
11:          end
12:        end

    # File lib/action_controller/headers.rb, line 14
14:       def [](header_name)
15:         if include?(header_name)
16:           super 
17:         else
18:           super(normalize_header(header_name))
19:         end
20:       end