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

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require 'active_support/memoizable'

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module ActionController

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  module Http

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    class Headers < ::Hash

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      extend ActiveSupport::Memoizable

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      def initialize(*args)

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         if args.size == 1 && args[0].is_a?(Hash)

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           super()

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           update(args[0])

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         else

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           super

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         end

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       end

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      def [](header_name)

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        if include?(header_name)

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          super

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        else

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          super(env_name(header_name))

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        end

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      end

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      private

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        # Converts a HTTP header name to an environment variable name.

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        def env_name(header_name)

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          "HTTP_#{header_name.upcase.gsub(/-/, '_')}"

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        end

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        memoize :env_name

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    end

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  end

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end

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