env_name(key) private

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# File actionpack/lib/action_dispatch/http/headers.rb, line 55
      def env_name(key)
        key = key.to_s
        if key =~ HTTP_HEADER
          key = key.upcase.tr('-', '_')
          key = "HTTP_" + key unless CGI_VARIABLES.include?(key)
        end
        key
      end
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