How to add Cache-Control: public to static files

Hi, I have nginx set up to serve static content and to set it to maximum
expires currently. However, I would also like to set the Cache-Control
flag to public so that proxies will know that this is okay to cache.
However, when I try this using the add_header directive, this adds an
additional Cache-Control: header instead of modifying the existing one.

nginx config fragment:
location ~* ^.+.(jpg|jpeg|gif|png|ico)$ {
access_log off;
expires max;
add_header Cache-Control public;
}

what I get using curl:
HTTP/1.1 200 OK
Date: Tue, 06 Oct 2009 02:12:27 GMT
Content-Type: image/gif
Content-Length: 96
Last-Modified: Thu, 17 Sep 2009 01:51:06 GMT
Connection: close
Vary: Accept-Encoding
Expires: Thu, 31 Dec 2037 23:55:55 GMT
Cache-Control: max-age=315360000
Cache-Control: public
Accept-Ranges: bytes

add_header isn’t used for rewriting the header. Currently nginx supports
only “no-cache” and “max-age=###” values
in "Cache-Control.

Hello!

On Tue, Oct 06, 2009 at 04:17:20AM +0200, Jauder Ho wrote:

    access_log off;

Last-Modified: Thu, 17 Sep 2009 01:51:06 GMT
Connection: close
Vary: Accept-Encoding
Expires: Thu, 31 Dec 2037 23:55:55 GMT
Cache-Control: max-age=315360000
Cache-Control: public
Accept-Ranges: bytes

Multiple Cache-Control lines are perfectly valid per RFC2616, it
shouldn’t cause any problems.

If you really want them to be in single line, just set everything
in add_header instead of using “expires max” to set
Cache-Control: max-age and Expires. E.g.

 add_header Expires "Thu, 31 Dec 2037 23:55:55 GMT";
 add_header Cache-Control "public, max-age=315360000";

Maxim D.

On Mon, Oct 05, 2009 at 10:35:13PM -0400, Chris Z. wrote:

add_header isn’t used for rewriting the header. Currently nginx supports
only “no-cache” and “max-age=###” values
in "Cache-Control.

These values are affected by “expires” directive only.
You may add any Cache-Control values via add_header.

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