Force the WWW at the Beginning of the URL

.htaccess

# Rewrite example.com → www.example.com
# Use with caution, as this may cause subdomains to forward as well.
<IfModule mod_rewrite.c>
    RewriteCond %{HTTPS} !=on
    RewriteCond %{HTTP_HOST} !^www\..+$ [NC]
    RewriteCond %{HTTP_HOST} !=localhost [NC]
    RewriteCond %{HTTP_HOST} !=127.0.0.1
    RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
</IfModule>