Hi,

I'm trying to conditionally set the "Expires" header. This tiny
snippet does not work as expected:

location ~* testing/.*\.png$ {
if ($request_uri ~* "\.png\?[0-9]+$") {
expires max;
}
try_files $uri /testing/oops.png;
}

The basic problem is that if the png does not exist and there is a
query string, I get a 404 instead of oops.png. All other combinations
seem to work fine. I have read IfIsEvil, but the alternatives
presented (try_files, return, redirect) do not cover the case of
setting headers.

Is this possible with nginx config? Is there some extension module I
could use to achieve this?

-Greg

P.S. Yes, this is a contrived example. My actual case is to continue
on to an image generating proxy instead of "oops.png". but the error
is the same.

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