How to test if file exists with the tag on Apache 2.4?

Question

I would like to test the existence of a file in my httpd.conf of Apache 2.4.

I use the tag like this :

Answer 1

You should read Apache error log as it might provide some hint on how it is interpreted.

Anyway, the right syntax is: <If "-f %{DOCUMENT_ROOT} . '/maintenance.enable'">