def _render_template(options)
        if options.delete(:stream)
          Rack::Chunked::Body.new view_renderer.render_body(view_context, options)
        else
          super
        end
      end
def _render_template(options)
        if options.delete(:stream)
          Rack::Chunked::Body.new view_renderer.render_body(view_context, options)
        else
          super
        end
      end
Call render_body if we are streaming instead of usual +render+.