How to disable HTTP 1.0 protocol in Apache?

1. Ensure to load mod_rewrite module in httpd.conf file

2. Enable RewriteEngine directive as following and add Rewrite condition to allow only HTTP 1.1

   RewriteEngine On
   
   RewriteCond %{THE_REQUEST} !HTTP/1.1$
   
   RewriteRule .* - [F]
   

You may try this mod_rewrite, this worked for me. Here the server would try to respond with a 403-Forbidden response code.

RewriteCond %{THE_REQUEST} HTTP/1\.0$
RewriteCond %{REQUEST_URI} !^/path-to-your-custom-403-error-page\.html$
RewriteRule .? - [F]