Files are not cached via htaccess, what should I do?

Question

htaccess

I put this code in htaccess:

<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault "access plus 1 month"
</IfModule>

In theory, it should cache all files, but Google analysis says that caching does not occur.
Why can this be and how to deal with it?

Answer 1

It seems to me that this module is not installed on your web server. Check it for inclusion.