formats() public

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# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 52
      def formats
        @env["action_dispatch.request.formats"] ||=
          if parameters[:format]
            Array(Mime[parameters[:format]])
          elsif use_accept_header && valid_accept_header
            accepts
          elsif xhr?
            [Mime::JS]
          else
            [Mime::HTML]
          end
      end
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