I have two php scripts (css.php and js.php) which combine all css and js
files. To make things faster on the client side, I want to

- set expires header to far future
- not set cookies for those request

Here is what works now:
location ~ \.php$ {
# php cgi stuff goes here

if ($request_uri ~ (css|js)\.php) {
expires max;
}
}

location ~ (css|js)\.php {
fastcgi_hide_header Set-Cookie;
}

The question is -- why it's not allowed to use *fastcgi_hide_header
Set-Cookie;* inside the if () { ... } statement?

Regards,
Kaspars