Hello francis,

> > Howto set expires only if upstream does not have set an expires?

> * Francis Daly <francis@daoine.org> [2017-11-23 00:26]:

> You can set a value based on $upstream_http_expires --

> { default off; "" 7d; }

> in the appropriate "map" should set your Expires time to 7 days from
> now if there is not an Expires: header from the upstream.

thanks a lot. That solved my problem. I used the same:

map $upstream_http_expires $expires {
default off;
"" 7d;
}

server {
....
expires $expires;
}

Works like a charm. Thank you again for solving my problem. I thought about
using a map but missed the 'off' possibility and its behaviour.

Cheers,
Thomas
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