set_cookies!

# File actionpack/lib/action_controller/rack_process.rb, line 245
      def set_cookies!
        # Convert 'cookie' header to 'Set-Cookie' headers.
        # Because Set-Cookie header can appear more the once in the response body,
        # we store it in a line break separated string that will be translated to
        # multiple Set-Cookie header by the handler.
        if cookie = headers.delete('cookie')
          cookies = []

          case cookie
            when Array then cookie.each { |c| cookies << c.to_s }
            when Hash  then cookie.each { |_, c| cookies << c.to_s }
            else            cookies << cookie.to_s
          end

          @cgi.output_cookies.each { |c| cookies << c.to_s } if @cgi.output_cookies

          headers['Set-Cookie'] = [headers['Set-Cookie'], cookies].flatten.compact
        end
      end