htaccess redirection

.htaccess

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://example.com/$1 [R,L]

RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.html\ HTTP/
RewriteRule ^index\.html$ https://example.com/ [R=301,L]

<FilesMatch ".(jpg|jpeg|png|gif|ico|svg)$">
  Header set Cache-Control "max-age=7776000, public"
</FilesMatch>
<FilesMatch ".(css|js)$">
  Header set Cache-Control "max-age=7776000, public"
</FilesMatch>
Options All -Indexes
<FilesMatch "\.(ttf|otf|eot|woff|woff2)$">
  <IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "*"
    Header set Cache-Control "max-age=31536000, public"
  </IfModule>
</FilesMatch>
<Files .htaccess>
order allow,deny
deny from all
</Files>
ErrorDocument 404 /404.html