--- oldhttpd-2.4.37/modules/generators/mod_autoindex.c 2017-05-02 07:01:17.000000000 -0400 +++ httpd-2.4.37/modules/generators/mod_autoindex.c 2018-11-26 02:46:14.181041720 -0500 @@ -179,7 +179,7 @@ " \n Index of ", title, "\n", NULL); } else { - ap_rvputs(r, DOCTYPE_HTML_3_2, + ap_rvputs(r, DOCTYPE_HTML_4_01, "\n \n" " Index of ", title, "\n", NULL);