--- oldhttpd-2.4.37/modules/examples/mod_example_hooks.c 2016-02-09 18:09:24.000000000 -0500 +++ httpd-2.4.37/modules/examples/mod_example_hooks.c 2018-11-26 02:42:28.417980763 -0500 @@ -1006,7 +1006,7 @@ * Now send our actual output. Since we tagged this as being * "text/html", we need to embed any HTML. */ - ap_rputs(DOCTYPE_HTML_3_2, r); + ap_rputs(DOCTYPE_HTML_4_01, r); ap_rputs("\n", r); ap_rputs(" \n", r); ap_rputs(" mod_example_hooks Module Content-Handler Output\n", r);