RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
    RewriteRule . - [L]
    RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f
    RewriteRule . - [L]
    RewriteCond %{DOCUMENT_ROOT}/users/%{REQUEST_URI} -d
    RewriteRule ^(.+)$ /users/$1/ [L]
    RewriteCond %{DOCUMENT_ROOT}/users/%{REQUEST_URI} -f
    RewriteRule ^(.+)$ /users/$1 [L]