How to make Varnish not caching response if they do not have proper cache header?

[Ryan Chan]

Seems *Varnish* is caching too aggressively, e.g. I have a *index.php* does
not send out *last-modifieid*,*cache-control*, Varnish still cache it.

my default.vcl

backend default {
    .host = "127.0.0.1";
    .port = "8080";
}

Is it possible to turn off this strange behaviors?



Thanks.
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