How to stop varnish from rewriting expires headers for static?

Question

linux

Put varnish before nginx with simple
backend default {
.host = "127.0.0.1";
.port="8181";
}
By default, Varnish apparently rewrites the expires and max-age header for images, and it is configured differently in nginx for different images, how can I force it to leave expires from nginx?

Answer 1

ENIP, Varnish does not change headers by default, dig towards nginx.

Answer 2

Try setting expires on an external Nginx (if it looks at port 80), and not on the back end.