Using meta at the head

You can use html only to redirect.

To do it add to you head the followinf meta:

<meta http-equiv="refresh" content="0; url=http://example.com/" />

Alternatives

You can use JavaScript code to do the redirect. The recommended way is to send a 301 in the header. If you are using Apache you can edit .htaccess to do the redirect or configure a regular expresions with nginx.

Web applications like wordpress or cpanel allows you to configure redirects.