<IfModule mod_rewrite.c>
RewriteEngine On RewriteBase /subdirectory RewriteRule ^index\.html$ - [L] RewriteCond
%{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule . /index.html [L]
</IfModule>