vendor/rails/actionpack/lib/action_controller/headers.rb

   1 require 'active_support/memoizable'
   2
   3 module ActionController
   4   module Http
   5     class Headers < ::Hash
   6       extend ActiveSupport::Memoizable
   7
   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
  16
  17       def [](header_name)
  18         if include?(header_name)
  19           super
  20         else
  21           super(env_name(header_name))
  22         end
  23       end
  24
  25       private
  26         # Converts a HTTP header name to an environment variable name.
  27         def env_name(header_name)
  28           "HTTP_#{header_name.upcase.gsub(/-/, '_')}"
  29         end
  30         memoize :env_name
  31     end
  32   end
  33 end