serve

# File actionpack/lib/action_dispatch/middleware/static.rb, line 78
      def serve(request, filepath, content_headers)
        original, request.path_info =
          request.path_info, ::Rack::Utils.escape_path(filepath).b

        @file_server.call(request.env).tap do |status, headers, body|
          # Omit content-encoding/type/etc headers for 304 Not Modified
          if status != 304
            headers.update(content_headers)
          end
        end
      ensure
        request.path_info = original
      end