Options +FollowSymLinks +ExecCGI
<IfModule mod_rewrite.c>
RewriteEngine On
# we skip all files with .something
RewriteCond %{REQUEST_URI} ..+$
RewriteCond %{REQUEST_URI} !.html$
RewriteRule .* - [L]
# we check if the .html version is here (caching)
RewriteRule ^$ index.html [QSA]
RewriteRule ^([^.]+)$ $1.html [QSA]
RewriteCond %{REQUEST_FILENAME} !-f
# no, so we redirect to our front web controller
RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>
# big crash from our front web controller
ErrorDocument 500 "<h2>Application error</h2>symfony application failed to start properly"