Use standard headers is better for me too. I suggested to use X-Accel-Expires only because in the past I had problems with `Expires` / `Cache-Control`. But maybe now things have changed. So, let's take the "standards way".

I'm doing few tests to find a good setup. Do you want NGINX take care of both headers, `Cache-Control` and `Expires` or we can forget this last one ?

This doesn't mean that NGINX remove or modify the `Expires` header. It's just not considered when calculating the TTL.