_process_options

# File actionpack/lib/action_controller/metal/streaming.rb, line 201
      def _process_options(options)
        super
        if options[:stream]
          if request.version == "HTTP/1.0"
            options.delete(:stream)
          else
            headers["Cache-Control"] ||= "no-cache"
            headers["Transfer-Encoding"] = "chunked"
            headers.delete("Content-Length")
          end
        end
      end